🐾 NyankoTools
434 free tools
Everyday tools like JSON formatting and Base64 conversion, plus careful support for Japanese-specific text processing like kana and full-width/half-width conversion — all running entirely in your browser. Nothing you type is ever sent to a server.
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Text46
- Text
Character Counter
Counts characters, words, and lines in real time, plus the length against X (Twitter)'s 280-character limit.
- Text
Full-width / Half-width Converter
Converts between full-width and half-width for alphanumerics, symbols, katakana, and spaces, with each character type selectable individually.
- Text
Hiragana / Katakana Converter
Converts Japanese text between hiragana and katakana — handy for learners checking vocabulary, flashcards, and loanwords.
- Text
Machine-Dependent Character Checker
Detects machine-dependent characters such as circled numbers, Roman numerals, and ligatures like ㈱ ㍉ ㍻, with a safe replacement suggestion for each.
- Text
Text Diff Checker
Compares two texts line by line and highlights added and removed lines, with options to ignore whitespace or case differences.
- Text
Dummy Text Generator
Generates Lorem ipsum (Latin) or Japanese placeholder text by paragraphs, sentences, or words, in any count you choose.
- Text
Text List Deduplicate, Sort & Shuffle
Deduplicates, sorts (alphabetical, reverse, or numeric), or randomly shuffles newline-separated text, with options to remove empty lines and trim whitespace.
- Text
Line Ending Converter
Detects the line endings (LF, CRLF, or CR) in your text and converts them all to the type you choose.
- Text
Text Case Converter
Converts text into 9 naming conventions at once, including camelCase, PascalCase, snake_case, and kebab-case. Handy for renaming variables and functions.
- Text
Encoding Converter & Mojibake Fixer
Detects a text file's encoding and converts between Shift_JIS, EUC-JP and UTF-8. Diagnoses and repairs garbled text.
- Text
Kanji Numeral Converter
Converts Japanese kanji numerals to Arabic digits and back, including formal daiji numerals (壱弐参) used on contracts, and converts every number in a block of text at once.
- Text
Kyujitai ⇔ Shinjitai Converter
Converts between old kanji forms (國 學 體) and modern forms (国 学 体), including name variants like 髙 and 﨑, and lists the characters it changed.
- Text
Romaji ⇔ Hiragana Converter
Converts romaji to hiragana or katakana, and kana to romaji in Hepburn or Kunrei-shiki style, with options for long vowels and letter case.
- Text
English to Katakana Converter
Converts English words to katakana from their spelling using simple rules and a small dictionary of common words, and can spell out acronyms like USB.
- Text
Unicode Text Decorator
Converts letters and numbers into fancy Unicode text such as bold, italic, script, circled, fullwidth and strikethrough, ready to paste into bios and usernames.
- Text
Special Characters & Emoji List
A click-to-copy list of stars, hearts, arrows, circled numbers, unit symbols, kaomoji and emoji, with keyword search.
- Text
Unicode Escape / Unescape
Converts text to Unicode escapes like \u3042 and back. Supports JavaScript, ES6, Python, U+ notation and HTML numeric references, with correct emoji handling.
- Text
Zero-Width Character Remover
Detects and removes invisible characters such as zero-width spaces, BOM and bidi controls, showing each type and count before cleaning your text.
- Text
Reading Time Calculator
Paste text to estimate reading time, speaking time and Japanese manuscript paper sheets (400 or 200 characters). Handles mixed Japanese and English.
- Text
Text Merge Tool
Compare two versions of a text and choose A, B, or both for each difference to merge them into one. Edit the result by hand, then copy or download it.
- Text
Find & Replace and Line Tools
Bulk find and replace (regex supported), add or remove line numbers, keep or remove lines by keyword, add a prefix or suffix to each line, and reverse line order.
- Text
Newline to Comma & Delimiter Converter
Convert between newline, comma, tab, space, and custom delimiters. Trim, dedupe, and quote items.
- Text
Morse Code Translator
Translate text to Morse code and back, including Japanese Wabun kana. Play it as sound or a light flash at a chosen speed (WPM) and tone.
- Text
Japanese Braille Converter (Kana ⇔ Unicode Braille)
Convert Japanese kana to six-dot braille in Unicode characters and back, with voiced marks, yoon, sokuon and number signs plus per-cell dot numbers
- Text
Number to Words Converter
Convert a number to English words, ordinals and check-writing format (and 50/100 dollars), plus its Japanese reading in hiragana, with British "and" support
- Text
HTML Tag Stripper
Strips HTML tags and extracts plain text. Keeps line breaks, collapses whitespace, optionally keeps link URLs. Scripts are never executed.
- Text
Word Frequency Counter
Count how often each word or character appears in your text, rank the top results and export as CSV
- Text
Unicode Normalizer
Convert text to Unicode NFC, NFD, NFKC or NFKD, fix decomposed dakuten, and see which characters changed.
- Text
Text Extractor (Emails, URLs, Phones)
Extract emails, URLs, phone numbers, dates and hashtags from text, with duplicate removal.
- Text
Indent Converter
Convert leading indentation between tabs and spaces, or change the indent width. Only line-start whitespace changes.
- Text
ASCII Table Generator
Turn CSV, TSV or Excel cells into an ASCII or Unicode box-drawing text table for READMEs and code comments.
- Text
Shell, Regex, SQL, CSV & JSON String Escape
Escape and unescape quotes and special characters for shell, regex, SQL, CSV and JSON strings.
- Text
URL Slug Generator
Turn titles, including Japanese, into clean URL slugs: kana to romaji, symbols stripped, hyphen-separated, with a length limit.
- Text
Memorization Sheet Maker
Wrap key terms in ** to hide them like a red study sheet. Click to reveal answers and print hidden or revealed.
- Text
Vertical Text Converter
Convert horizontal Japanese into vertical text for social posts, with vertical punctuation, one-per-line or column layouts, and a vertical preview.
- Text
Passport Romaji Name Converter
Converts a Japanese name in kana to passport Hepburn romaji: long O/U vowels omitted, M before B/M/P, optional OH spelling.
- Text
Japanese Notation Variants Checker
Checks Japanese text for notation variants (okurigana, kanji vs kana, katakana, full/half-width mixing) and suggests recommended forms.
- Text
Readability Checker
Check sentence length, kanji ratio, repeated endings and conjunctions, and comma use; highlights weak sentences
- Text
Ruby (Furigana) HTML Tag Generator
Generate HTML ruby tags for furigana from a simple bracket notation, with optional rp parentheses and preview.
- Text
String Similarity & Edit Distance
Compute Levenshtein edit distance, similarity percentage, and insert/delete/replace steps between two strings.
- Text
Whitespace & Invisible Character Visualizer
Show tabs, no-break and ideographic spaces, line breaks (LF/CRLF), control and zero-width characters as symbols, with counts.
- Text
Text Box & Speech Bubble
Wrap text in a Unicode box, ASCII border or speech bubble, with comment prefixes for code
- Text
Upside Down & Mirror Text Generator
Flip text upside down, mirror it or reverse it, and copy it for bios and game names.
- Text
Byte Length Counter (UTF-8, Shift_JIS, UTF-16)
Count a string in UTF-8, Shift_JIS and UTF-16 and see where it exceeds a byte limit. For DB columns, API limits and SMS.
- Text
Markdown TOC Generator
Generate a nested table of contents from Markdown headings with GitHub-style anchors, depth limits and bullet or numbered lists.
- Text
Anagram & Palindrome Checker
Check whether two words are anagrams or a phrase is a palindrome, ignoring case, spaces, punctuation and kana differences.
Data Formats27
- Data Formats
JSON Formatter
Formats and minifies JSON data, with clear syntax error messages.
- Data Formats
YAML to JSON Converter
Converts between YAML and JSON, handy for checking Docker Compose or GitHub Actions config files.
- Data Formats
CSV to JSON Converter
Converts between CSV and JSON using the header row as keys, with support for comma/tab delimiters and quoted fields.
- Data Formats
CSV/JSON to SQL INSERT Generator
Generates INSERT statements (optionally with CREATE TABLE) from CSV or JSON, with MySQL/PostgreSQL/SQLite quoting and type inference.
- Data Formats
CSV Viewer (Sort & Filter)
View CSV as a table, sort by column, filter rows, reorder or remove columns and export again. Virtual scrolling keeps big files fast.
- Data Formats
TOML to JSON/YAML Converter
Converts between TOML, JSON, and YAML, handy for checking a TOML config file like Cargo.toml or pyproject.toml.
- Data Formats
Markdown to HTML Converter
Converts Markdown to HTML with a live preview, and HTML back to Markdown. Handy for checking a README or article draft.
- Data Formats
SQL Formatter
Formats and minifies SQL queries, with support for MySQL, PostgreSQL, SQLite, BigQuery and other dialects, indent width, and keyword case.
- Data Formats
CSS/JS/HTML Minifier
Formats and minifies CSS, JavaScript, and HTML code, with a selectable indent width.
- Data Formats
JSON to Types Converter
Generates type definitions from JSON as TypeScript interfaces, C# classes, Go structs, Python dataclasses, or Java records, handling nested objects, arrays, optional and nullable fields.
- Data Formats
JSON Diff
Compares two JSON documents structurally and lists added, removed, and changed values with their paths. Ignores key order, with an option to ignore array order.
- Data Formats
XML to JSON Converter
Converts between XML and JSON, handling attributes and text, and reports syntax errors such as unclosed tags with line and column.
- Data Formats
.env to JSON Converter
Converts between .env files and JSON, handling comments, export prefixes, and quoted values.
- Data Formats
CSV to Excel (XLSX) Converter
Converts CSV to an Excel .xlsx file and exports xlsx sheets to CSV, with Shift_JIS detection, sheet selection and UTF-8 BOM output.
- Data Formats
CSV/TSV to Markdown Table Converter
Converts CSV or TSV (including tables copied from Excel) into a Markdown table, with column alignment, padding, and optional header row.
- Data Formats
HTML Table to CSV Converter
Converts an HTML <table> to CSV or TSV, expanding merged cells, choosing among multiple tables, and adding a BOM for Excel.
- Data Formats
JSON Tree Viewer
Browse JSON as a collapsible tree, search keys and values, and copy the path (JSONPath or JSON Pointer) of any node.
- Data Formats
JSON Schema Generator
Generates a JSON Schema from a JSON sample, with draft 2020-12, 2019-09, or 07, required keys, additionalProperties, and format detection.
- Data Formats
JSONL (NDJSON) to JSON / CSV Converter
Convert JSONL (NDJSON, JSON Lines) to and from a JSON array or CSV, skipping blank lines and reporting the line number of bad records
- Data Formats
JSON5 ⇔ JSON Converter
Convert JSON5 or JS object literals to JSON and back. Handles comments, trailing commas, unquoted keys and hex numbers, with line and column errors.
- Data Formats
Markdown Table Editor
Edit a Markdown table in a grid: add, delete and reorder rows and columns, set alignment, copy padded output
- Data Formats
JSON Key Sorter & Flatten
Sort JSON keys recursively, flatten nested JSON to a.b[0] paths, and unflatten it back.
- Data Formats
XML Formatter & Validator
Format, minify and validate XML with line and column error positions
- Data Formats
YAML Formatter & Validator
Format and validate YAML with line and column error positions. Sort keys and handle multiple documents.
- Data Formats
CSV Split, Merge and Remove Duplicates
Split CSV by rows or file count (ZIP), merge CSVs with header checks, and remove duplicate rows by key column. Runs in your browser.
- Data Formats
Excel Column Letter ⇔ Number Converter
Convert Excel column letters and numbers (A=1, AZ=52, XFD=16384), split A1 references like $B$3, and count columns in a range.
- Data Formats
Query String ⇔ JSON Converter
Convert URL query strings to JSON and back, with nested keys and b[] / b[0] / repeated-key array styles.
Date & Time18
- Date & Time
Unix Timestamp Converter
Converts between a Unix timestamp (epoch seconds or milliseconds) and a date/time, and shows the current timestamp.
- Date & Time
Cron Expression Simulator
Explains a cron expression in plain English and lists its upcoming run times. Handy for checking crontab or GitHub Actions schedules.
- Date & Time
Japanese Era Converter
Converts between the Japanese era calendar (Meiji, Taisho, Showa, Heisei, Reiwa) and the Western year, with an era reference table covering transition dates.
- Date & Time
Date Calculator
Calculates the difference in days between two dates, or the date a set number of days before or after a given date, with an option to count both endpoints.
- Date & Time
Age Calculator
Calculates the exact age, traditional East Asian age, days lived, and days until the next birthday from a date of birth, with a customizable reference date.
- Date & Time
Time Zone Converter & World Clock
Converts a date and time to the local time in cities around the world at once, with daylight saving support, and doubles as a world clock.
- Date & Time
Japan Business Day Calculator & Holiday List
Finds the date N business days away and counts business days in a range, skipping weekends and Japanese national holidays, and lists holidays by year.
- Date & Time
Printable Calendar Generator (Monthly & Yearly)
Create a printable monthly or yearly calendar with optional Japanese holidays, ISO week numbers and a Sunday or Monday week start.
- Date & Time
Timer, Stopwatch & Pomodoro Timer
A browser stopwatch with laps, a countdown timer, a Pomodoro timer, and a hidden-count challenge to stop at an exact time, with an alarm sound when time is up.
- Date & Time
Time Calculator
Total work hours, add or subtract time, and convert between h:mm and decimal hours.
- Date & Time
Birthday Info (Zodiac, Star Sign, Birthstone)
Look up the zodiac animal, star sign, birthstone, birth flower, and day of the week for any date of birth.
- Date & Time
Japanese School Grade Chart
Looks up the Japanese school grade, entry year, and graduation year from a date of birth, or the birth dates for a grade, with early-born support and an adjustable school year.
- Date & Time
Anniversary Calculator
List 100-day, monthly and yearly anniversary dates from a start date, with days remaining, plus a countdown to any event.
- Date & Time
Rokuyo & Lunar Calendar (Taian, Butsumetsu, Solar Terms)
A monthly calendar showing rokuyo lucky days (Taian, Butsumetsu…), old lunar dates, 24 solar terms and holidays, plus a date lookup (1900–2100)
- Date & Time
Japanese Lucky Day Calendar (Tensha, Ichiryumanbai, Tora)
Find Japanese lucky days (Tenshanichi, Ichiryumanbai, Tora, Mi) and unlucky Fujoju days. Filter by wedding, business launch or wallet.
- Date & Time
Nine Star Ki (Kyusei Kigaku) Calculator
Look up your Nine Star Ki year star and month star from your birth date, with element and a year-to-star chart.
- Date & Time
Shift Schedule Maker (Auto-Assign, Printable)
Make a printable monthly shift or duty roster. Auto-assigns fairly, honors days off and a max streak, and exports CSV.
- Date & Time
Week Number Calculator
Find the ISO week number, ISO year, weekday, day of year and quarter for any date, or look up a week's Monday-to-Sunday dates.
Image & Design59
- Image & Design
Color Converter
Converts color codes between HEX, RGB, and HSL, with a color picker for choosing colors visually.
- Image & Design
Color Space Converter (RGB, CMYK, Lab, OKLCH)
Convert between RGB, HEX, HSL, CMYK, HWB, Lab and OKLCH, and copy CSS lab(), oklch() and hwb() values.
- Image & Design
Chart Maker (Bar, Line, Pie) to PNG
Paste CSV or a table to make a bar, line or pie chart and save it as a PNG. Supports multiple series, titles and axis labels.
- Image & Design
Image Format Converter
Converts PNG, JPEG, GIF, and BMP images to WebP, JPEG, or PNG with adjustable quality, and supports converting several files at once.
- Image & Design
Image Resizer & Compressor
Resizes images by pixel size or percentage and compresses them to WebP, JPEG, or PNG, with support for processing several files at once.
- Image & Design
Image to Base64 Converter
Converts an image file to a Base64 string or Data URL, and converts a Base64 string or Data URL back into a downloadable image.
- Image & Design
Favicon Generator
Generates favicon.ico (bundling 16/32/48px) and multiple PNG sizes (apple-touch-icon, etc.) from a single image, plus the HTML link tags to reference them.
- Image & Design
EXIF Viewer & Remover
Reads a JPEG photo's Exif metadata (date taken, camera, lens, exposure, GPS location, and more), and lets you download a copy with only the Exif data removed, at full quality.
- Image & Design
Pixelate, Mosaic & Color Reduction
Pixelates or mosaics an image by block size and reduces its color palette, then exports it as WebP, JPEG, or PNG.
- Image & Design
Image Color Palette Extractor
Detects the dominant colors in an image and lists each as a HEX/RGB code with its usage percentage, ready to copy.
- Image & Design
SVG Optimizer (SVGO)
Optimizes SVG files or code with SVGO, stripping unnecessary metadata to reduce file size.
- Image & Design
Placeholder Image Generator
Generates dummy placeholder images from a width, height, colors, and text, and saves them as PNG, JPEG, or WebP.
- Image & Design
Cat Logo Text Generator
Creates cat-style logo text and lets you place ears, whiskers, paws, hearts, stars and moons freely, then saves it as a transparent PNG.
- Image & Design
SVG Wave & Blob Generator
Generate SVG wave section dividers and organic blob shapes. Adjust waves, amplitude, randomness and color, reproduce with a seed, and copy SVG or CSS.
- Image & Design
Color Blindness Simulator
Simulate how an image or color code looks with protanopia, deuteranopia, tritanopia or total color blindness. Check design accessibility and contrast.
- Image & Design
Color Contrast Checker (WCAG)
Calculates the contrast ratio between text and background colors and checks it against WCAG AA/AAA levels for normal and large text.
- Image & Design
SVG to PNG Converter
Converts SVG files or code to PNG at 1x to 4x resolution, with a transparent, white, or custom background.
- Image & Design
OGP Image Generator
Creates a social share (OGP) image at 1200×630 as PNG from a title and site name, with adjustable background and text colors.
- Image & Design
Image Cropper, Rotator & Flipper
Crops images to any area, rotates in 90° steps, and flips horizontally or vertically, with aspect ratio locking and PNG, JPEG, or WebP output.
- Image & Design
Image Background Remover (With Outline)
Makes a solid-color background transparent and saves a PNG, with edge cleanup for leftover background color and an optional outline of any color and width.
- Image & Design
HEIC to JPG Converter
Converts iPhone HEIC and HEIF photos to JPEG, PNG, or WebP, with batch conversion and adjustable quality.
- Image & Design
Image Merger
Combines multiple images into one, side by side, stacked, or in a grid, with reordering, spacing, margin, background color, and size matching, saved as PNG, JPEG, or WebP.
- Image & Design
Add Text or Watermark to Image
Adds text to an image or tiles a watermark across it, with position, size, color, opacity, outline, and angle controls, saved as PNG, JPEG, or WebP.
- Image & Design
GIF Maker
Creates an animated GIF from several images in order, with frame delay, width, background color, looping, and ping-pong playback, all processed in your browser.
- Image & Design
OCR-Resistant Image Obfuscator
Adds subtle distortion, noise, and fine lines to text in an image to make automatic OCR reading harder. No guarantee of effect. Saves as PNG.
- Image & Design
Image to Text (OCR)
Extract text from images in English or Japanese. Recognition runs in your browser and the image is never uploaded. Accuracy is not guaranteed.
- Image & Design
Image Blur & Mosaic
Drag to select parts of an image and hide faces or personal info with mosaic, blur, or a solid fill.
- Image & Design
Color Palette Generator
Generate complementary, analogous and triadic color schemes from one base color and copy HEX, CSS variables or JSON
- Image & Design
Image Filter & Color Adjustment
Adjust brightness, contrast, saturation, black & white, and sepia with sliders. Compare before and after, then save.
- Image & Design
Image to ASCII Art Converter
Convert an image into ASCII art with adjustable width, character set and invert, then copy or save it as text
- Image & Design
Round Image Cropper (Circle & Rounded)
Crop an image into a circle or rounded corners and save a transparent PNG or WebP. Great for profile icons.
- Image & Design
Image Padding (Add Margins & Make Square)
Add margins to an image or fit it to 1:1, 4:5, or 16:9 with a background color or transparency. Saves as PNG, JPEG, or WebP.
- Image & Design
Image Splitter (Grid & Instagram 3x3)
Split an image into equal rows and columns and save all tiles as one ZIP. Supports the Instagram 3x3 grid, 3-panel carousels and 2x2, as PNG, JPEG or WebP.
- Image & Design
Hanko & Date Stamp Maker
Make a round hanko, square company seal, or date stamp image with your name and save a transparent PNG.
- Image & Design
Signature Maker (Transparent PNG)
Draw a handwritten signature with your mouse or finger and save it as a transparent PNG with pen width, color, and auto-trim.
- Image & Design
Japanese Traditional Colors
Browse 260+ traditional Japanese colors with names, readings, HEX and RGB codes. Search and click to copy.
- Image & Design
ASCII Art Text Generator (FIGlet-style Banner)
Turn text into big ASCII art lettering (text banners) with 8 fonts such as Standard, Slant and Doom (including a dot font for Japanese), adjustable spacing and code-comment output
- Image & Design
Image Compare Slider
Compare two images with a draggable before/after slider. Switch horizontal or vertical, show labels, and save a side-by-side PNG.
- Image & Design
Image Frame Maker (Polaroid, Border & Rounded)
Add Polaroid, border, picture-frame, rounded and shadow frames to photos. Pick the color, thickness and corners and save as PNG, JPEG or WebP.
- Image & Design
Gradient Wallpaper Generator
Create linear, radial or conic gradient wallpapers at any resolution and save as PNG or JPEG.
- Image & Design
Device Mockup Generator (Phone, Laptop & Browser)
Put a screenshot into a phone, tablet, laptop or browser frame and save the mockup as a PNG. Transparent background and shadow options.
- Image & Design
Avatar Generator (Initials & Identicon)
Makes avatar icons from initials or a seed string (GitHub-style identicon), with color, shape and font options, and saves them as PNG.
- Image & Design
Tailwind Color Scale Generator
Generate a Tailwind-style 50-950 color scale from one base color. Copy as CSS variables, Tailwind v4 @theme or tailwind.config.js.
- Image & Design
Pixel Art Editor
Draw pixel art in your browser with pen, eraser, fill and picker tools, then export a scaled transparent PNG.
- Image & Design
Screenshot Annotator
Paste a screenshot and add arrows, boxes, numbered badges and text, then save as PNG. Runs in your browser.
- Image & Design
Mosaic to Smooth Gradient
Replace a mosaic area with a smooth color blend built from its blocks and the surrounding pixels.
- Image & Design
Image Reveal Mask
Cover an image with a solid color and cut out shapes like circles, stars and hearts to reveal the original underneath.
- Image & Design
Compress Image to Target Size
Compress an image to under a target file size such as 200KB. JPEG or WebP quality is found automatically.
- Image & Design
Image DPI Changer
Change PNG/JPEG DPI without re-encoding and check the print size in mm and paper fit
- Image & Design
Image Diff (Pixel Comparison)
Compares two images pixel by pixel and shows the difference rate on a heatmap. Set a tolerance, handle mismatched sizes, and save the diff as PNG.
- Image & Design
Image Logo Watermark
Overlay a logo on an image with nine positions, size, opacity, margin, rotation, and tiling. Save as PNG or JPEG. Runs in your browser; no upload.
- Image & Design
Meme Generator
Add bold outlined top and bottom captions to any image to make a meme. Text auto-shrinks and wraps to fit. PNG/JPEG, in your browser.
- Image & Design
Sticker Outline Maker
Add a sticker-style outline to a cutout PNG, with custom width and color, a double border, a shadow, and hole filling.
- Image & Design
Screen Color Picker
Pick any color on your screen with the eyedropper and get HEX, RGB and HSL codes. Image mode for other browsers.
- Image & Design
Photo Collage Maker
Make a collage from 2-9 photos with layout templates. Set spacing, borders, corners and background; save as PNG, JPEG or WebP. Runs in your browser.
- Image & Design
Document Scan Filter (Shadow Removal & B&W)
Remove shadows and whiten phone photos of documents. Choose color, grayscale or black & white. Runs in your browser; nothing is uploaded.
- Image & Design
SVG Path Viewer
Split an SVG path d attribute into commands and see start, end and control points on the shape. Edit coordinates or trim decimals.
- Image & Design
Color Mixer
Mix two colors by ratio and generate N intermediate shades in RGB or OKLab
- Image & Design
GIF Splitter & Speed Changer
Split an animated GIF into frames and save a PNG sequence as ZIP, or change the frame delay in bulk and rebuild the GIF. Runs in your browser, no upload.
Encode/Decode12
- Encode/Decode
Base64 Encoder/Decoder
Converts text to and from Base64, with full support for multibyte characters.
- Encode/Decode
URL Encoder/Decoder
Converts text to and from percent-encoding, with full support for multibyte characters in query parameters.
- Encode/Decode
HTML/JS String Escape & Unescape
Escapes and unescapes HTML special characters (& < > " ') and JavaScript string escape sequences such as newlines and quotes.
- Encode/Decode
JWT Decoder
Decodes a JWT (JSON Web Token) and displays its header and payload as formatted JSON, with time-based claims like exp/iat shown as human-readable dates. The signature is not verified.
- Encode/Decode
Multi-Step Encode/Decode & Hash Chain
Chain Base64, URL, hex, HTML escape, MD5/SHA-256 and more in any order and convert in one go, with every intermediate result shown.
- Encode/Decode
Classical Cipher Tool (Caesar, ROT13)
Encrypt and decrypt with Caesar, ROT13, ROT47, Vigenere, or Atbash. Includes a brute-force list of all 25 Caesar shifts.
- Encode/Decode
Base32/58/62/85 & Hex Encoder
Encode or decode text as Base16 (hex), Base32, Base58, Base62 or Base85 in your browser.
- Encode/Decode
Text to Binary / Hex Converter
Convert text to binary, octal or hex bytes in UTF-8, UTF-16 or Shift_JIS, and back
- Encode/Decode
Punycode Converter
Convert IDN domains to xn-- Punycode and back
- Encode/Decode
File to Base64 / Data URI Converter
Converts any file (PDF, audio, fonts, ZIP) to Base64 or a Data URI, and decodes Base64 back into a downloadable file.
- Encode/Decode
SVG to Data URI Converter
Convert SVG code to a data URI for CSS background-image, using compact URL encoding or Base64.
- Encode/Decode
JWK to PEM Converter
Convert JWK to PEM (SPKI / PKCS#8) and PEM back to JWK for RSA, EC, and Ed25519 keys. Runs in your browser; nothing is sent.
Generate20
- Generate
UUID Generator
Generates 1 to 100 random UUIDs (v4) at once, with optional hyphen removal and uppercase formatting.
- Generate
Password Generator
Generates strong random passwords by choosing character types (uppercase, lowercase, numbers, symbols) and length, with a strength estimate.
- Generate
Hash Generator
Computes MD5, SHA-1, and SHA-256 hashes from text in real time.
- Generate
QR Code Generator
Generates a QR code from a URL or text and downloads it as a PNG, with a selectable error correction level.
- Generate
Barcode Generator
Generates CODE128, EAN-13, EAN-8, UPC, CODE39, and ITF barcodes and lets you download them as PNG images.
- Generate
ULID & NanoID Generator
Generates 1 to 100 time-sortable ULIDs or compact, URL-friendly NanoIDs at once, with custom length and alphabet for NanoID.
- Generate
Dummy Personal Data Generator (JSON, CSV)
Generate up to 1,000 fake people with names, emails, phones, addresses, and birthdays as JSON, CSV, or TSV, with a seed for repeatable output.
- Generate
Random String & Number Generator
Generate up to 1,000 random strings from your characters, or random integers and decimals in a range with no duplicates
- Generate
Number Sequence & Date List Generator
Generate zero-padded number sequences and date lists with weekdays, skipping weekends
- Generate
Graph Paper, Lined & Dot Grid Generator
Make printable graph paper, lined paper or dot grid sheets in A4, A3, Letter and more with an exact cell size in mm. Print or save as SVG.
- Generate
Checksum Calculator
Calculates CRC-32, CRC-16, Adler-32, and Fletcher checksums of text or files.
- Generate
ICS File Generator
Create an .ics calendar event file or Google Calendar link with recurrence, reminders and all-day events.
- Generate
vCard Generator (.vcf & QR)
Create a vCard (.vcf) contact file and a contact QR code from name, phone, email and address.
- Generate
Math Drill Generator
Make printable addition, subtraction, multiplication and division worksheets with an answer sheet.
- Generate
Envelope Address Printer
Print recipient and sender addresses on Japanese envelopes at true size, with postal code boxes, vertical or horizontal.
- Generate
Wi-Fi QR Code Generator
Create a Wi-Fi QR code from an SSID and password. Supports WPA, WEP, open and hidden networks
- Generate
Tokushoho Notice Generator (Japan Commercial Transactions Act)
Draft the legal disclosure page required for online sales in Japan from the required items, as text, Markdown or HTML. A template, not legal advice
- Generate
Privacy Policy Template Generator
Generate a privacy policy template with Google Analytics, AdSense, cookie and affiliate clauses (Japan). Not legal advice
- Generate
Business Card Maker
Make a 91 × 55 mm business card with a vCard QR code and print it life-size, 10 per A4 sheet.
- Generate
Resume Maker (Rirekisho)
Make a Japanese resume (rirekisho) in a JIS-style layout and print it on A4. Add an ID photo and save a draft in your browser. Nothing is uploaded.
Development60
- Development
Regex Tester
Tests a regular expression against sample text with match highlighting, a capture group list, and a live replacement preview.
- Development
Chmod Permission Calculator
Converts file permissions between checkboxes, octal notation (e.g. 755), and symbolic notation (e.g. rwxr-xr-x), with setuid/setgid/sticky bit support.
- Development
CIDR / Subnet Calculator
Calculates the network address, broadcast address, and usable host count from CIDR notation or an IP address plus subnet mask.
- Development
Keycode (e.code / e.key) Checker
Shows the event.key, event.code, keyCode, location, and modifier keys of any key you press, in real time. Handy for checking values while implementing keyboard event handling.
- Development
Screen Size & Viewport Checker
Shows the viewport size, window size, screen resolution, device pixel ratio, and current Tailwind CSS breakpoint in real time. Handy for checking responsive designs.
- Development
JSON Path / JSON Pointer Tester
Tests a JSONPath or JSON Pointer (RFC 6901) query against your JSON data and lists every matched value with its absolute path. Handy for checking a query before pulling a value out of an API response.
- Development
Base Converter (Binary/Octal/Decimal/Hex)
Converts numbers between binary, octal, decimal, and hexadecimal in real time. Supports 0x/0b/0o prefixes and negative numbers.
- Development
CSS Gradient Generator
Builds linear/radial CSS gradients with a live preview from color stops, angle, and shape.
- Development
CSS clip-path Generator
Build clip-path shapes by dragging polygon points, or use circle, ellipse and inset, with presets like triangle, star and speech bubble.
- Development
CSS Box-Shadow Generator
Builds multi-layer CSS box-shadow declarations with a live preview from offset, blur, spread, color, and inset.
- Development
CSS Border-Radius Generator
Builds a CSS border-radius with a live preview from four independent (or linked) corner values, with px/% unit switching.
- Development
px to rem Converter
Converts between px and rem in real time with a customizable base font size.
- Development
Meta Tag & OGP Generator
Generates basic meta tags, Open Graph (OGP), and Twitter Card tags from a page title, description, URL, and image, with a social share preview.
- Development
cURL to Fetch / Axios Converter
Converts a curl command to JavaScript fetch or axios code. Handles headers, JSON bodies, form data, and basic auth; it only parses the command and never sends a request.
- Development
HTTP Header Analyzer & Security Check
Check pasted response headers for missing or weak HSTS, CSP, and cookie flags, and copy recommended nginx, Apache, or _headers config.
- Development
CSS clamp() Calculator
Generate a fluid typography clamp() expression from min/max font sizes and viewport widths.
- Development
CSS Flexbox & Grid Generator
Generate Flexbox and Grid CSS with a live preview by choosing direction, alignment, gap and columns.
- Development
Unicode Character Inspector
Look up code points, UTF-8/UTF-16 bytes and categories of characters, or convert U+XXXX back to text
- Development
URL Parser & Query Editor
Split a URL into protocol, host, path, query and hash, edit parameters and rebuild it
- Development
User-Agent Parser
Parse a User-Agent string into browser, OS, rendering engine and device type, and see the UA of your own browser automatically.
- Development
CSS Text-Shadow Generator
Builds multi-layer CSS text-shadow declarations with a live preview, including neon and outline presets.
- Development
CSS Glassmorphism & Neumorphism Generator
Generates CSS for frosted-glass (backdrop-filter) and neumorphic (layered box-shadow) elements with material presets and a live preview.
- Development
CSS Animation Generator
Builds CSS @keyframes animations from presets with cubic-bezier easing, duration, delay, iterations, and a live preview, plus prefers-reduced-motion output.
- Development
HTTP Status Codes List & Search
Search HTTP status codes such as 404, 301, 500, and 429 by number, name, or keyword, with meanings, causes, and fixes.
- Development
MIME Type Lookup
Look up the MIME type (Content-Type) for a file extension, or the extensions for a MIME type, with partial-match search
- Development
robots.txt Generator
Generate robots.txt with per-user-agent Allow/Disallow rules, sitemaps, and AI bot blocking
- Development
sitemap.xml Generator (from URL list)
Turn a URL list into sitemap.xml with bulk lastmod, changefreq and priority, invalid/duplicate URL removal, and splitting past 50,000 URLs
- Development
.htaccess Generator (Redirects, Force HTTPS, www)
Generate .htaccess rules for forcing HTTPS, www canonicalization, per-URL 301/302 redirects and error pages, with loop warnings
- Development
IP Address Converter
Convert IPv4 to decimal, hex and binary, and compress or expand IPv6 addresses. The input format is detected automatically.
- Development
Semver Calculator
Compare semver versions and check ranges (^ ~ >= || x, hyphen) with prerelease support, npm-compatible.
- Development
JSON-LD Structured Data Generator
Generate JSON-LD structured data for FAQ, Article, Product and BreadcrumbList from a form, and copy the script tag.
- Development
UTM Builder
Build campaign URLs with UTM parameters. Presets, bulk URLs and history. Runs in your browser.
- Development
Htpasswd Generator (Basic Auth, bcrypt/SHA-1)
Generate .htpasswd lines for Basic auth with bcrypt or SHA-1, for multiple users, plus Authorization headers.
- Development
nginx Redirect Generator
Generate nginx config for forced HTTPS, www canonical, trailing slashes and 301/302 redirects
- Development
Port Number List & Search
Look up TCP/UDP port numbers like 22, 80, 443, and 3306 by number, range, or service name, with their uses.
- Development
HTML Table Generator
Build an HTML table by choosing rows and columns. Merge cells with colspan and rowspan, add a header row, and copy the code with CSS.
- Development
Date Format String Builder
Builds date format strings for strftime, Java, PHP, Day.js/Moment.js and .NET from a sample, and converts between them.
- Development
Regex Pattern Library
Copy-ready regex patterns for Japanese postal codes, phone numbers, katakana, email, URL, IPv4, dates, and UUIDs, with match and non-match examples.
- Development
Bitwise Calculator
Calculate AND, OR, XOR, NOT, shifts and rotates for 8/16/32/64-bit values, with a bit-by-bit view and two's complement.
- Development
IEEE 754 Float Viewer
View float32/float64 sign, exponent and mantissa bits, convert from bits, and see why 0.1+0.2 is off. Handles NaN, Infinity, subnormals.
- Development
Clipboard Inspector
List pasted clipboard formats: MIME types, HTML source, images and files
- Development
Snowflake ID, ObjectID & UUID Timestamp Decoder
Decode the creation time and parts of Snowflake IDs, MongoDB ObjectIDs, UUID v1/v6/v7 and ULIDs. Batch decoding supported.
- Development
Open Source License Generator
Generate MIT, Apache-2.0, BSD, ISC and other license text with your name and year, plus SPDX IDs.
- Development
Directory Tree Diagram Generator
Turn an indented folder list into a ├── └── tree for your README. Aligned comments, depth folding, ASCII style and reverse conversion.
- Development
CSS Filter Generator
Build CSS filter code with live preview: blur, brightness, contrast, grayscale, hue-rotate, drop-shadow and more.
- Development
CSS Transform Generator
Builds CSS transform declarations with a live preview: translate, rotate, scale, skew, 3D rotation, perspective, and origin.
- Development
CSS Specificity Calculator
Calculate CSS selector specificity (a, b, c) line by line and compare selectors to see which rule wins.
- Development
CSS Button & Toggle Switch Generator
Generate CSS buttons, pure-CSS toggle switches, triangles and arrows with hover effects, a live preview and contrast check.
- Development
CSS Pattern Background Generator
Generate stripe, polka dot and checkerboard backgrounds as CSS gradients or SVG, preview them and copy the code.
- Development
mailto, tel & SMS Link Generator
Generate mailto, tel and SMS links with subject, body, CC and BCC. Get an encoded href and an HTML anchor tag.
- Development
CSS Color Names List
Browse all 148 CSS named colors with HEX and RGB values. Search by name or code and click to copy.
- Development
HTML Entity List
Look up HTML character entities by name, decimal or hex code, then copy them.
- Development
Cron Expression Generator
Build cron expressions visually by picking minute, hour, day, month and weekday. Supports steps, ranges, lists and Quartz output.
- Development
ISO 8601 Duration Converter
Converts ISO 8601 durations (PT1H30M, P1Y2M3D, P2W) to seconds, minutes, hours and days, converts seconds back, and adds a duration to a date.
- Development
Cookie Parser (Cookie & Set-Cookie)
Parses Cookie and Set-Cookie headers into name, value, Domain, Path, Expires, Max-Age, Secure, HttpOnly and SameSite, and flags common mistakes. Values are masked.
- Development
umask Calculator
Find the permissions new files and directories get from a umask, or work back to the umask you need.
- Development
docker run to docker-compose Converter
Converts a docker run command to a docker-compose.yml file. Handles ports, volumes, env vars, --name and --restart, and warns about options it cannot convert.
- Development
Regex Explainer
Break a regular expression into character classes, quantifiers, groups, lookarounds and flags, and read what each part does. Syntax errors show their position.
- Development
CSS Unit Converter
Convert px, rem, em, vw, vh, vmin, ch and pt between each other with your viewport and font sizes.
- Development
Fetch / Axios to cURL Converter
Converts JavaScript fetch or axios code to a curl command. Handles method, headers, JSON bodies, and FormData; it only parses the code and never runs it.
Calculate69
- Calculate
Hourly Wage Converter & Overtime Pay Calculator
Converts between hourly, daily, monthly, and annual wages, and simulates overtime, holiday, and late-night premium pay.
- Calculate
Consumption Tax & Discount Calculator
Converts between tax-included and tax-excluded prices, and calculates the discounted price from a discount rate or amount.
- Calculate
Ratio & Percentage Calculator
Reduces a ratio to its simplest whole-number form, solves for a missing term in a proportion, and converts between a part, a whole, a percentage, and a rate of change.
- Calculate
BMI Calculator
Calculates your Body Mass Index from height and weight, shows the WHO weight category, and gives the healthy weight range for your height.
- Calculate
Freelancer Take-Home Pay Calculator
Estimates a Japanese freelancer's income tax, reconstruction surtax, and resident tax from annual revenue, expenses, and deductions, with a rough take-home pay figure.
- Calculate
Mortgage Prepayment Comparison Calculator
Compares the interest saved, term shortened, or monthly payment reduced by a lump-sum mortgage prepayment, for both the "shorten term" and "reduce payment" strategies.
- Calculate
Investment Growth Simulator
Solves for any one of initial investment, monthly contribution, annual return, or time horizon from the other three under compound interest, with a chart and year-by-year table, plus a sustainable monthly withdrawal estimate.
- Calculate
JASSO Student Loan Repayment Simulator
Estimates the monthly payment, total repayment, and total interest for a JASSO Type 2 (interest-bearing) student loan, comparing the fixed-rate and rate-review repayment methods.
- Calculate
Unit Converter (Length, Weight, Area, Volume, Temperature, Data)
Convert length, weight, area, volume, temperature, and data size, including metric, imperial, traditional Japanese units, and KB vs KiB.
- Calculate
Split Bill Calculator (Rounding & Uneven Shares)
Split a total among people with rounding up, down, or to the nearest unit, and let some people pay more. Shows the extra or shortfall.
- Calculate
BMR & Calorie Calculator
Estimate your basal metabolic rate and daily calorie needs from age, sex, height, weight, and activity level, with calorie targets for losing or gaining weight.
- Calculate
Japan Salary Take-Home Pay Calculator
Estimate annual and monthly take-home pay in Japan from gross salary after social insurance, income tax, and resident tax, using 2025-2026 rules.
- Calculate
Furusato Nozei Donation Limit Calculator
Estimate the furusato nozei (hometown tax) donation limit for a ¥2,000 out-of-pocket cost from your salary and deductions, using 2025-2026 rules.
- Calculate
My Number & Corporate Number Validator
Validates or calculates the check digit of a Japanese My Number (12 digits) or Corporate Number (13 digits, incl. the invoice registration number). Nothing is sent to a server.
- Calculate
Electricity Cost Calculator (Watts to Monthly & Yearly Cost)
Estimate what an appliance costs to run from its wattage, daily hours, and rate per kWh. See cost per hour, day, month, and year.
- Calculate
Download Time Calculator (File Size & Internet Speed)
Calculate how long a download takes from the file size and your connection speed in Mbps, Gbps, or MB/s, with a real-world speed factor.
- Calculate
Statistics Calculator (Mean, Median, Standard Deviation)
Paste numbers to get mean, median, mode, variance, and standard deviation at once, plus a T-score for any value.
- Calculate
Break-Even Calculator (Units, Sales & Target Profit)
Work out break-even units and sales from price, variable cost, and fixed costs, plus the volume needed for a target profit.
- Calculate
Fuel Cost Calculator
Calculate fuel cost and cost per km from distance, fuel economy and price, and split a road trip among passengers.
- Calculate
Aspect Ratio Calculator
Simplify a width and height to an aspect ratio, or find the missing side from a ratio and one dimension. Includes 16:9 and 4:3 presets.
- Calculate
Roman Numeral Converter
Convert numbers 1–3999 to Roman numerals and back. Non-standard forms like IIII are flagged with the standard form, with lowercase and Unicode (Ⅻ) output and a quick-reference table.
- Calculate
Prime Factorization, GCD & LCM Calculator
Factor an integer into primes, list its divisors with their count and sum, and check primality. Also finds the GCD and LCM of several integers, with BigInt support.
- Calculate
Permutation & Combination Calculator
Calculate nPr, nCr, factorials and repetition variants exactly, with every digit shown even for huge values.
- Calculate
GPA Calculator
Calculate GPA from course credits and grades. Supports 4.0, 4.3 and Japanese university scales.
- Calculate
Screen Size Calculator
Convert a screen diagonal in inches to width and height in cm, and get PPI, dot pitch and a viewing distance estimate. Works backwards from cm too.
- Calculate
Due Date & Pregnancy Week Calculator
Estimate your due date, current pregnancy week and month, and key milestones from your last period, ovulation date, or a known due date.
- Calculate
Paid Leave Days Calculator (Japan)
Calculate annual paid leave grant dates and days in Japan from your hire date and weekly schedule, including proportional grants.
- Calculate
Running Pace Calculator
Calculate running pace, speed, finish time and distance, plus race predictions and heart rate zones.
- Calculate
Loan & Revolving Payment Calculator
Estimate monthly payments, total interest and payoff time for amortizing, equal-principal and revolving credit, with a repayment schedule.
- Calculate
Size Converter (Clothing, Shoes & Rings)
Convert women’s and men’s clothing, shoe and ring sizes between Japan, US, EU and UK. A handy guide for overseas shopping.
- Calculate
Invoice, Quotation, Receipt & Delivery Note Generator
Create invoices, quotations, receipts and delivery notes in Japan’s qualified invoice layout and save them as PDF, with per-rate tax totals and rounding options
- Calculate
Unit Price Comparator
Compare products by price per 100 g, 100 ml or item. Handles 3+ products, pack counts and tax, and shows the cheapest and the gap.
- Calculate
Savings Goal Calculator
Enter two of target amount, time frame and monthly savings to solve the third. Handles a starting balance and 0% interest, with a yearly table.
- Calculate
Rental Initial Cost Calculator
Estimate upfront rental costs in Japan (deposit, key money, agent fee, prepaid rent) and a rent guide from income.
- Calculate
Bonus Take-Home Pay Calculator (Japan)
Estimate your net bonus in Japan after social insurance and withholding income tax, from the gross bonus and last month’s pay (2025 brackets).
- Calculate
Japan Income Wall Checker (Take-Home Reversal)
Check Japan’s income walls (¥1.06M, ¥1.3M, ¥1.6M) for part-timers and dependents and see where take-home pay drops. Estimate only.
- Calculate
Unemployment Benefit Calculator (Japan)
Estimate Japan's unemployment insurance basic allowance: daily amount, benefit days and waiting period by age, insured period and reason.
- Calculate
Childcare Leave, Maternity & Sickness Benefit Calculator (Japan)
Estimate Japan’s childcare leave benefit (67% / 50%), maternity allowance and sickness allowance from your pay and standard remuneration.
- Calculate
Retirement Allowance Tax Calculator
Estimate tax on a Japanese retirement allowance: retirement income deduction, half taxation, income tax and resident tax.
- Calculate
Rental Property Yield Calculator
Estimate gross yield, net yield (NOI) and cash flow after loan payments for a rental property.
- Calculate
Macro (PFC) Calculator
Calculate daily protein, fat, and carb grams from your calorie target and macro ratio. Estimate calories from BMR and activity.
- Calculate
Sleep Calculator
Work out your bedtime or wake-up time from 90-minute sleep cycles, with an adjustable time to fall asleep.
- Calculate
Pet Age Calculator (Dog & Cat)
Convert your dog's or cat's age to human years, with a chart by dog size.
- Calculate
Cooking Unit Converter
Convert tablespoons, teaspoons, cups, grams and ml for flour, sugar, butter, honey and more, with a weight chart.
- Calculate
Recipe Scaler
Scale an ingredient list to any number of servings. Handles fractions, ranges and units
- Calculate
Wallpaper, Paint, Tile & Flooring Quantity Calculator
Estimate rolls of wallpaper, cans of paint, and tiles or flooring boxes from room size, minus doors and windows, plus waste.
- Calculate
A/B Test Significance & Sample Size Calculator
Check if an A/B test result is significant (p-value, z-test, confidence interval) and estimate the sample size you need.
- Calculate
Linear Regression & Correlation Calculator
Fit a least-squares regression line to x,y data: slope, intercept, correlation r and R², with a scatter plot and predictions.
- Calculate
Matrix Calculator
Add, multiply, transpose and invert matrices up to 6x6 and find determinants, with exact fractions or decimals.
- Calculate
Quadratic & Linear System Solver
Solve quadratic equations and 2- or 3-variable linear systems with step-by-step working, including complex roots and no-solution cases.
- Calculate
Area & Volume Calculator
Find the area of circles, triangles and trapezoids and the volume of cylinders, cones, spheres and boxes, with formulas and steps.
- Calculate
Function Grapher
Plot y=f(x) graphs online. Overlay up to 6 functions, pan and zoom, switch degrees/radians and save as PNG.
- Calculate
Scientific Calculator
Online scientific calculator with trig, logs, roots, powers and factorials. Keyboard input, degrees/radians, history.
- Calculate
Daily Proration Calculator
Prorate monthly rent, salary or subscription fees by days or dates, with calendar, 30-day or 365-day basis and rounding options
- Calculate
Luhn Checker & Card Brand Detector
Validate card numbers with the Luhn algorithm and detect the brand by IIN. Includes public payment test numbers.
- Calculate
ISBN & EAN-13 Check Digit Validator
Validate or calculate ISBN-10, ISBN-13 and EAN/JAN check digits and convert ISBN-10 to ISBN-13.
- Calculate
Print Size Converter
Convert mm, pt, px and inches by DPI, with an A-series and B-series paper size chart
- Calculate
Lat/Long Converter (DMS) & Distance Calculator
Convert latitude and longitude between decimal degrees and DMS, and calculate distance, bearing and midpoint of two points with Haversine.
- Calculate
Ohm's Law Calculator
Find voltage, current, resistance or power from any two. Also series/parallel resistance and LED resistor values.
- Calculate
Resistor Color Code Calculator
Read 4-, 5- and 6-band resistor color codes or convert a resistance to bands, with tolerance and the nearest E series value.
- Calculate
Withholding Tax Calculator for Fees
Calculate Japanese withholding tax on freelance fees (10.21%, 20.42% above ¥1M), the amount transferred, and net-to-invoice reverse math.
- Calculate
Stamp Duty Calculator (Contracts & Receipts)
Look up the Japanese revenue stamp tax for contracts, receipts and bills by document type and amount, including the relief rates.
- Calculate
Gift Tax Calculator (Japan, Calendar-Year)
Estimate Japanese gift tax with the ¥1.1M basic deduction, special and general rate tables, and split calculation for mixed gifts.
- Calculate
Depreciation Calculator (Japan, Straight-Line & Declining)
Yearly depreciation from cost and useful life: straight-line and 200% declining balance, monthly proration, and Japan small-asset checks.
- Calculate
Parcel Size Checker (Sum of Sides & Weight Class)
Enter length, width, height and weight to see the Yamato, Yu-Pack and Sagawa size class and whether Nekopos, Yu-Packet or Letter Pack fits. Shows the limit exceeded.
- Calculate
FX Calculator (Pips, Lot Size, Margin)
Calculate forex profit and loss in pips and yen plus required margin from the pair, lots, leverage, direction, entry and exit rate.
- Calculate
METs Calorie Calculator
Calculates calories burned from METs, body weight, and time. Includes a METs table of common activities and totals several exercises.
- Calculate
Histogram Maker & Frequency Table
Make a frequency distribution table (relative and cumulative) and a histogram from pasted data. Set the bin width and save as PNG.
- Calculate
Large Number Chart
Idle-game number cheat sheet: compare commas, K/M/B/T suffixes and Japanese units (万・億・兆), and convert any value.
PDF13
- PDF
PDF Merge, Split & Extract
Merge several PDFs into one, split a PDF by page count, or extract just the pages you need.
- PDF
PDF ⇔ Image Converter
Convert PDF pages to PNG or JPEG images, or combine several images into one PDF.
- PDF
PDF Compressor
Reduce PDF file size by recompressing each page as an image.
- PDF
PDF Page Editor
Rotate, delete and reorder PDF pages, or remove the password from a PDF you know the password for.
- PDF
PDF Password Protector
Add a password to a PDF and encrypt it with AES-256, with optional print/copy/edit restrictions.
- PDF
PDF Redactor
Black out names, addresses and amounts in a PDF by dragging, and export a file where the hidden text cannot be recovered.
- PDF
PDF Page Numbers & Watermark
Add page numbers and watermark text such as CONFIDENTIAL or DRAFT to every page of a PDF, with position, size, opacity and angle controls.
- PDF
PDF Metadata Editor
View, edit or remove a PDF’s title, author, keywords and dates. Handy for clearing personal details before sharing.
- PDF
PDF to Markdown & Text Converter
Extract PDF text and convert it to Markdown or plain text with headings, lists and tables detected. Handy for preparing documents for AI tools.
- PDF
PDF N-up (2-up, 4-up Pages per Sheet)
Shrink several PDF pages onto one sheet with 2-up, 4-up, 6-up, 8-up or 9-up layouts. Set orientation, order, margin and borders.
- PDF
PDF Margin Cropper
Crop PDF margins by number, drag or auto-detect. Trim all pages at once or page by page, and save the file with a new CropBox.
- PDF
PDF Signature & Stamp Placer
Place a signature or stamp image on a PDF: drag to position, resize, and apply to one or many pages. Not a digital signature; runs in your browser.
- PDF
PDF Image Extractor
Extract the images embedded in a PDF as PNG and save them all as a ZIP. Supports a page range and a small-image filter.
Camera4
- Camera
Webcam & Microphone Test
Check your webcam video, actual resolution, frame rate (FPS) and microphone level in the browser. Ideal before a call or stream.
- Camera
QR Code Reader (Camera & Image)
Scan QR codes with your camera or from an image file, with URLs and Wi-Fi details recognized automatically. Reads common barcodes too in supporting browsers.
- Camera
ID Photo Maker (Passport & Resume)
Take a photo with your webcam or phone, or pick one, and crop it to ID photo sizes like 35×45mm or 30×40mm. Fill the margins with any color.
- Camera
Camera Color Picker (Live Eyedropper)
Point your camera at anything and pick its color as HEX, RGB or HSL by moving over the live video. Handy for matching paint, clothes and products.
Security17
- Security
Password Strength Checker
Rates a password by length, character types, and weak patterns like sequences and keyboard runs, and estimates how long it would take to crack.
- Security
Text Encryptor & Decryptor
Encrypt text with a password using AES-256-GCM and share it as Base64, then decrypt it with the same password.
- Security
File Encryptor & Decryptor
Encrypt a file with a password using AES-256-GCM and save it as .enc, then decrypt it with the same password.
- Security
HMAC Generator
Compute HMAC-SHA1/256/384/512 signatures from a message and secret key, and compare them with a received signature.
- Security
JWT Generator
Generate HMAC-signed JWTs (HS256/HS384/HS512) from a header, payload and secret for API auth debugging and learning.
- Security
TOTP Code Generator
Generate and verify 2FA TOTP codes from a Base32 secret or an otpauth:// URI, for debugging and testing.
- Security
Bcrypt Hash Generator & Verifier
Generate a bcrypt hash from a password and verify it against an existing hash, with an adjustable cost factor.
- Security
X.509 Certificate Decoder
Paste a PEM SSL/TLS certificate to read its issuer, validity dates, SANs, public key, and fingerprints.
- Security
SSH Key Fingerprint Viewer
Compute the SHA256 and MD5 fingerprint of an SSH public key, including multi-line authorized_keys.
- Security
Key Pair Generator
Generate RSA, ECDSA, or Ed25519 public/private key pairs in PEM format. Keys are created in your browser and never sent.
- Security
CSP & SRI Hash Generator
Build a Content-Security-Policy per directive and copy it as nginx, Apache, or _headers config. Also generates SRI integrity hashes and tags.
- Security
Passphrase Generator (Diceware)
Generate memorable Diceware passphrases from the EFF large wordlist (7,776 words), with word count, separator and entropy options.
- Security
SPF & DMARC Record Generator
Build SPF and DMARC TXT records and check existing ones for the 10-lookup limit, +all, and pct errors. No DNS queries.
- Security
Email Header Analyzer
Paste raw email headers to trace the Received path and hop delays, read SPF, DKIM and DMARC results, and spot From mismatches.
- Security
Shamir's Secret Sharing (Split & Combine)
Split a text secret into n shares and recover it from any k of them with Shamir secret sharing. Runs in your browser.
- Security
RSA Encrypt & Decrypt
Encrypt with a PEM public key using RSA-OAEP and decrypt with the private key
- Security
Digital Signature Tool
Create and verify digital signatures with RSA-PSS or ECDSA using PEM keys. Output is Base64.
File7
- File
File Hash Calculator
Drag and drop files to calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes, and compare them with a published checksum.
- File
ZIP Maker & Extractor
Bundle files into a ZIP, or open a ZIP, browse its contents and save only the files you need. Works with non-English file names.
- File
File Type Detector
Identify a file’s real format from its magic number, warn when the extension does not match, and view a hex dump
- File
Duplicate File Finder
Find duplicate files by SHA-256 hash from multiple files or a folder, see the wasted space per group, and copy or export the results as CSV.
- File
File Splitter & Joiner
Split a large file into .001, .002 parts of any size to fit email limits, then join them back into the original.
- File
Bulk File Renamer
Rename many files with numbering, find and replace, and case changes, then save them as a ZIP
- File
Hex Viewer
View any file as hex and ASCII, jump to an offset, and search for hex or text bytes, even in large files
Hardware18
- Hardware
Microphone Test (Level & Recording)
See your microphone input level live, detect clipping, and record a clip to play back. Handy before a call or stream.
- Hardware
Keyboard Tester (Test Every Key)
Press every key and see it light up on an on-screen keyboard so missed keys are obvious, with the key name and code shown.
- Hardware
Dead Pixel Test (Screen Check)
Fill the screen with a solid color to check a monitor or phone for dead pixels and uneven color, cycling through 9 colors with a click or the arrow keys.
- Hardware
Gamepad Tester (Buttons, Sticks & Drift)
Check every button, stick and trigger on your controller. Spot stick drift and try the rumble motors.
- Hardware
Speaker Test (Stereo Check & Tone Generator)
Check left and right channels on speakers or headphones, and play tones from 20 Hz to 20 kHz or a frequency sweep.
- Hardware
Mouse Tester (Click Speed & Polling Rate)
Measure click speed (CPS), check every mouse button, detect double-click chatter and estimate the polling rate.
- Hardware
Screen Recorder
Record your entire screen, a window or a browser tab right in the browser and save it as a video file. Nothing to install.
- Hardware
Refresh Rate Test (60/120/144Hz)
Measure your monitor or phone refresh rate in Hz from browser frame timing and see whether it is 60Hz, 120Hz, 144Hz and more.
- Hardware
Touch Screen Test (Multi-Touch & Ghost Touch)
Swipe the screen to check simultaneous touch points, drag trails, dead zones and ghost touches. Useful for diagnosing phone and tablet touch problems.
- Hardware
Noise Meter (Sound Level in dB)
Measure ambient noise in approximate dB with your microphone. Shows current, max and average levels, a graph and a noise guide. Nothing is recorded.
- Hardware
Screen Ruler (cm / inch, actual size)
Show an actual-size cm and inch ruler on screen. Calibrate it by matching the frame to a credit card; horizontal and vertical modes.
- Hardware
Spirit Level
Check if a surface is level with your phone’s tilt sensor. Bubble, angle and slope, plus zero-point calibration.
- Hardware
Motion Blur & Frame Skip Test
Check ghosting, motion blur and skipped frames with a moving object in full screen
- Hardware
Monitor Gamma & Banding Test
Check gamma, banding and black/white clipping on your monitor with fullscreen gray ramp, step and gamma checker patterns.
- Hardware
Hearing Test (Mosquito Tone)
Play high-frequency tones from 8 to 20 kHz to check your hearing range, with a rough age guide.
- Hardware
Screenshot Capture
Take a screenshot of your screen, a window or a browser tab in the browser and save or copy it as PNG. Delay timer included. No install needed.
- Hardware
Device Info Viewer
View screen resolution, DPR, CPU cores, memory, GPU, touch input and supported Web APIs, and copy the report.
- Hardware
MIDI Device Tester
Check MIDI keyboard and controller connections in your browser and watch notes, CC and pitch bend live
Games & Fun48
- Games & Fun
Roulette, Random Picker & Dice
Spin a roulette wheel from your own list, draw several winners without repeats, or roll dice like 1d6 and 2d6+3 using cryptographic randomness.
- Games & Fun
Amidakuji (Ghost Leg) Generator
Create an amidakuji ghost-leg ladder from names and outcomes. Hide results and trace one player at a time, reveal everyone, or save it as an image.
- Games & Fun
Gacha Probability Calculator
Calculate drop chances, pity cap expectations and gems needed
- Games & Fun
Random Team Generator
Paste a name list and split it into random teams by team count or team size. Leftovers are spread evenly; reshuffle and copy the result.
- Games & Fun
Bingo Caller & Card Generator
Call bingo numbers with history and full screen, and print a batch of bingo cards
- Games & Fun
Seating Chart Randomizer & Order Shuffler
Randomize a classroom seating chart or speaking order from a name list, with fixed seats and pairs kept apart
- Games & Fun
Omikuji (Daily Fortune)
Draw a free Japanese omikuji fortune slip. Get a daily fortune for today, or redraw as often as you like, with lucky color and number.
- Games & Fun
Typing Speed Test
Measure your typing speed in English or Japanese romaji. Get WPM, CPM, accuracy and your weakest keys. Accepts alternate romaji spellings.
- Games & Fun
Reaction Time Test
Click when the color changes. Measures your average and best reaction time in ms over 5 rounds
- Games & Fun
Sudoku
Play sudoku puzzles generated on the spot, with notes, hints and a mistake check
- Games & Fun
Memory Match
Flip emoji cards and find every pair. Choose 12, 16 or 30 cards and save your best moves and time
- Games & Fun
Sliding Puzzle
Play the 15 puzzle with numbers or your own image. 3×3, 4×4 and 5×5, always solvable, with best moves and time
- Games & Fun
2048
Merge tiles to reach 2048 by swiping or with arrow keys. 4×4, 5×5 and 6×6 boards, undo and best scores
- Games & Fun
Minesweeper
Classic mine-clearing puzzle with Beginner, Intermediate, Expert and custom boards. Safe first click, long-press flags on touch screens and best times
- Games & Fun
Reversi (Othello)
Play Reversi against the computer at four strength levels. Choose first or second, with legal-move hints and undo, right in your browser
- Games & Fun
Maze Generator
Generate a random maze by choosing its size and difficulty. Show the solution, save it as a PNG or print it for activity sheets
- Games & Fun
Word Search Generator
Make a word search puzzle from your own word list. Choose grid size and difficulty, show the answer key, save a PNG or print it for class or parties
- Games & Fun
Crossword Generator
Make a crossword puzzle from your own answers and clues, with numbered Across and Down clues, an answer key, PNG download and printing
- Games & Fun
Color Sense Test
A 60-second game of picking the one slightly different color tile. The difference shrinks as you go and your score sets your rank. For fun, not a color vision test
- Games & Fun
Game of Life
Conway’s Game of Life in your browser. Draw cells, play, step and adjust speed, and drop in presets like the glider, pulsar and Gosper gun
- Games & Fun
Picross (Nonogram)
Play picross puzzles with a single solution in 5×5, 10×10 or 15×15, or turn your own drawing or image into a puzzle
- Games & Fun
Invaders Game
A classic invaders-style shooter: shoot down the descending cat fleet. Keyboard and on-screen buttons, shields, a bonus UFO, levels and a best score
- Games & Fun
Snake Game
The classic Snake game: eat food to grow, avoid walls and your own tail. Arrow keys, WASD, swipes or on-screen buttons, with a saved best score
- Games & Fun
Falling Block Puzzle
The classic falling block puzzle: rotate and stack blocks to clear lines. Hold, next preview and landing guide, with keyboard and on-screen buttons
- Games & Fun
Rock Paper Scissors Game
Play rock paper scissors against the CPU and track your win streak, best streak and total record.
- Games & Fun
Breakout Game
Classic brick-breaker: bounce the ball off the paddle and clear every brick. Play with mouse, touch or keys.
- Games & Fun
Four in a Row
Drop discs and line up four to win. Play the computer at three levels as first or second player.
- Games & Fun
Hit and Blow Number Guessing Game
Guess a hidden 3–5 digit number from Hit and Blow clues. Choose repeated digits or not, review your guess history, or give up to see the answer
- Games & Fun
Lights Out
Lights Out puzzle: pressing a cell flips its neighbors. 3×3 to 7×7, always solvable, with a move counter and hints.
- Games & Fun
Mental Math Trainer
Practice mental arithmetic with a rank and best score. Choose operations, digits and a time limit.
- Games & Fun
Coin Toss
Flip a coin online and see heads or tails on a 3D coin. Flip several times in a row and track history and streaks using cryptographic randomness.
- Games & Fun
Loto & Numbers Number Picker
Pick random numbers for Japan’s Loto 6, Mini Loto, Loto 7 and Numbers 3/4, just for fun. Runs in your browser.
- Games & Fun
Aim Trainer
Click 20 targets to measure your average hit time, accuracy and misses. Best score saved in your browser.
- Games & Fun
Whack-a-Mole Game
Whack the cats popping out of holes in 30 seconds. It speeds up as you play and saves your best score.
- Games & Fun
Color & Sound Memory Game
Remember and repeat the order of four glowing, sounding panels. Keys 1-4 supported.
- Games & Fun
Number Memory Test
Memorize a number flashed on screen and type it back. One more digit each round.
- Games & Fun
Cat Clicker
A cozy idle clicker: pet the cat, buy upgrades and watch fish pile up. Progress is saved in your browser.
- Games & Fun
Tower of Hanoi
Play the Tower of Hanoi with 3 to 8 discs, compare your moves with the minimum, and watch the optimal solution.
- Games & Fun
Cat Jump Game
Flap a cat through pipe gaps with one button. Tap, click or press Space. Saves your best score. Free, mobile friendly.
- Games & Fun
Peg Solitaire
Jump pegs to remove them and leave just one. English 33-hole and European 37-hole boards, with undo.
- Games & Fun
Hangman
Guess the hidden English word one letter at a time. Pick a category like animals, food or travel.
- Games & Fun
Tic-Tac-Toe
Play against the computer at three levels, including an unbeatable minimax mode. Choose to move first or second.
- Games & Fun
Gomoku (Five in a Row)
Play Gomoku against the computer on a 15×15 board. Four levels, choose first or second, undo moves, no restricted moves.
- Games & Fun
Box Push Puzzle
Push every box onto a goal across 20 levels. Arrow keys, swipe or buttons, undo, and best-move records. Free browser puzzle.
- Games & Fun
Blackjack
Play blackjack against a computer dealer. Hit, stand or double down with virtual chips that have no cash value. For fun only.
- Games & Fun
Optical Illusions Gallery
Try 9 classic optical illusions such as Müller-Lyer and café wall. Show guide lines to see what is really equal or parallel.
- Games & Fun
One-Stroke Puzzle
Trace every line exactly once in one stroke. Three difficulty levels with undo, hints and endless new puzzles.
- Games & Fun
5-Letter Word Guessing Game
Guess the hidden five-letter English word in six tries, using green, yellow and gray clues.
Video & Audio16
- Video & Audio
Video & Audio Converter, Trimmer, Compressor
Convert video and audio to MP4, WebM, MP3 and more, trim a section, or shrink the file by lowering quality and resolution. Runs in your browser, no upload.
- Video & Audio
Video to GIF & Frame Extractor
Turn part of a video into an animated GIF with your FPS and width, or save any frame as PNG. Runs in your browser, no upload
- Video & Audio
Metronome & BPM Tap Tempo Counter
An online metronome from 20 to 300 BPM with time signatures and subdivisions, plus a tap tempo counter to find the BPM of a song
- Video & Audio
Instrument Tuner (Guitar, Bass, Ukulele)
Tune with your microphone using live pitch detection. Presets for guitar, bass and ukulele plus chromatic mode, with a cents meter
- Video & Audio
Audio Speed & Pitch Changer
Change audio speed and pitch (key) in semitones, preview, and save as WAV. Runs in your browser.
- Video & Audio
Text to Speech (Built-in Browser Voices)
Read text aloud with voices built into your device. Choose voice, speed, pitch and volume. Cloud voices are never used.
- Video & Audio
Noise Generator
Play white, pink or brown noise for focus and sleep, with a timer and fade-out.
- Video & Audio
Virtual Piano
Play a piano with your computer keyboard, mouse or touch. Four sounds and octave shift.
- Video & Audio
Audio Merger
Join several audio files into one with reordering, crossfades, silent gaps and fade in/out. Preview and save as WAV in your browser.
- Video & Audio
BPM to Delay Time Calculator
Convert BPM to delay times in ms and Hz per note value, plus reverb pre-delay and decay guides.
- Video & Audio
SRT ⇔ VTT Subtitle Converter
Convert subtitles between SRT and WebVTT, shift timings, fix frame rate drift, and detect Shift_JIS or UTF-8 encoding.
- Video & Audio
BPM Detector
Detect the BPM (tempo) of an MP3 or WAV file automatically, with half and double tempo candidates. Runs in your browser.
- Video & Audio
Note to Frequency Converter (Hz, MIDI, Cents)
Convert note names, MIDI note numbers and frequencies in Hz. Change the A4 reference pitch and see cents offsets and a frequency table
- Video & Audio
Video Speed Changer (Fast Forward & Slow Motion)
Speed up or slow down a video from 0.25x to 4x and save as MP4 or WebM. Runs in your browser, no upload
- Video & Audio
Video Merger
Join multiple videos into one MP4 or WebM in your browser. Reorder clips; size and fps follow the first video. Silent clips are padded. No upload.
- Video & Audio
Audio Silence Remover
Detect silent parts in audio on a waveform, then cut or shorten them with a dB threshold, minimum length and padding. Save as WAV.
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