Encoding & Cryptography Tools
Free online tools for Base64 encoding, URL encoding, hash generation (MD5, SHA-256, BLAKE3), number base conversion, and JWT token handling. Works offline.
Encode
Base64, URL, HTML, Hex
Hash
MD5, SHA, BLAKE2/3
Base
Binary, Octal, Hex
JWT
Sign & verify tokens
About Encoding & Cryptography Tools
Encoding transforms data between representations — Base64 for binary-to-text, URL-encoding for safe query strings, hex for low-level debugging. Cryptographic hashing creates fixed-size fingerprints used for integrity checks, password storage, and digital signatures. JWT (JSON Web Tokens) combine both worlds: Base64url-encoded payloads with HMAC or RSA signatures. These tools let you encode, decode, hash, and verify without installing anything. All computation stays in your browser.