🐾 NyankoTools

A collection of handy tools that run entirely in your browser. None of your data is ever sent to a server.

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  Character Counter

  Counts the characters, words, and lines of your text in real time.

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  JSON Formatter

  Formats and minifies JSON data, with clear syntax error messages.

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  Base64 Encoder/Decoder

  Converts text to and from Base64, with full support for multibyte characters.

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  URL Encoder/Decoder

  Converts text to and from percent-encoding, with full support for multibyte characters in query parameters.

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  UUID Generator

  Generates 1 to 100 random UUIDs (v4) at once, with optional hyphen removal and uppercase formatting.

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  Password Generator

  Generates strong random passwords by choosing character types (uppercase, lowercase, numbers, symbols) and length, with a strength estimate.

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  Hash Generator

  Computes MD5, SHA-1, and SHA-256 hashes from text in real time.

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  QR Code Generator

  Generates a QR code from a URL or text and downloads it as a PNG, with a selectable error correction level.

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  Color Converter

  Converts color codes between HEX, RGB, and HSL, with a color picker for choosing colors visually.

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  Unix Timestamp Converter

  Converts between a Unix timestamp (epoch seconds or milliseconds) and a date/time, and shows the current timestamp.

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  Full-width / Half-width Converter

  Converts between full-width and half-width for alphanumerics, symbols, katakana, and spaces, with each character type selectable individually.

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  Hiragana / Katakana Converter

  Converts Japanese text between hiragana and katakana — handy for learners checking vocabulary, flashcards, and loanwords.

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  YAML to JSON Converter

  Converts between YAML and JSON, handy for checking Docker Compose or GitHub Actions config files.

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  CSV to JSON Converter

  Converts between CSV and JSON using the header row as keys, with support for comma/tab delimiters and quoted fields.

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  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.