Encoders & Decoders

20 tools

Encoding and decoding are everyday tasks for developers — whether you're working with APIs, authentication tokens, cryptographic keys, or data serialization. All tools below run entirely in your browser using the Web Crypto API and built-in browser standards, so your data never leaves your device.

Base64 Encoder / Decoder
Encode & decode Base64 strings
Popular
URL Encoder / Decoder
Encode & decode URL components
HTML Entity Encoder
Encode & decode HTML entities
JWT Decoder & Verifier
Decode & verify JWT tokens with signature check
Popular
Hash Generator
MD5, SHA-1, SHA-256 & SHA-512 hashes
Base64 Image Encoder
Convert images to Base64 data URIs
Base64 Image Decoder
Decode Base64 strings back into images
GZIP Compress / Decompress
Compress & decompress text with GZIP
Text Escape / Unescape
Escape & unescape JSON, HTML, URL, XML & more
Backslash Escape / Unescape
Escape & unescape backslash sequences per language
Bcrypt Hash Generator
Hash & verify passwords with PBKDF2-SHA256
HMAC Generator
Generate HMAC-SHA256/384/512 message digests
AES Encrypt / Decrypt
Encrypt & decrypt text with AES-256-GCM
Popular
PDF Signature Checker
Check PDF files for digital signatures
Base32 Encoder / Decoder
Encode & decode Base32 strings (RFC 4648)
Punycode Encoder / Decoder
Convert internationalized domain names to Punycode
Morse Code Translator
Translate text to Morse code & back with audio
Hex String Encoder / Decoder
Convert text to hex strings & back
PBKDF2 Key Generator
Derive cryptographic keys with PBKDF2
Base58 Encoder / Decoder
Encode & decode Base58 (Bitcoin & Flickr alphabets)

What’s included

  • Base64 encoding & decoding for text, binary, and image data
  • URL encoding & decoding for query strings and path components
  • JWT decoding, inspection, and signature verification
  • Cryptographic hashing with MD5, SHA-1, SHA-256, and SHA-512
  • AES-256-GCM encryption and decryption
  • HMAC generation for message authentication
  • GZIP compression and decompression

Common use cases

  • Debugging API authentication tokens and JWTs
  • Encoding credentials or binary data for HTTP headers
  • Verifying file integrity with hash checksums
  • Encrypting sensitive data client-side before storage
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