Encode/Decode Tools

A list of our Encode/Decode tools. Nothing you enter is sent to a server; it is all processed in your browser.

• Base64 Encoder/Decoder

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

• URL Encoder/Decoder

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

• HTML/JS String Escape & Unescape

  Escapes and unescapes HTML special characters (& < > " ') and JavaScript string escape sequences such as newlines and quotes.

• 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.

• 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.

• 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.

• Base32/58/62/85 & Hex Encoder

  Encode or decode text as Base16 (hex), Base32, Base58, Base62 or Base85 in your browser.

• Text to Binary / Hex Converter

  Convert text to binary, octal or hex bytes in UTF-8, UTF-16 or Shift_JIS, and back

• Punycode Converter

  Convert IDN domains to xn-- Punycode and back

• 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.

• SVG to Data URI Converter

  Convert SVG code to a data URI for CSS background-image, using compact URL encoding or Base64.

• 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.