Free Encoder/Decoder & Hash Lab

Base64 · URL · HTML Entities · JWT Decode · SHA-256 / SHA-1 / MD5

What does this tool do? Encode, decode, and hash text using common algorithms. Perfect for debugging API requests, verifying data integrity, or decoding JWT tokens.

Zero uploads — all cryptography in your browser

View Technical Specifications (For Developers)

Base64: btoa()/atob() with UTF-8 safe encoding via TextEncoder
Hashing: SubtleCrypto.digest() for SHA-256/384/512, SHA-1. Pure JS MD5
JWT: Header/payload decoded via Base64URL. No signature verification (client-only)

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