Hash, encrypt, sign, and verify — locally.
Hashing, symmetric encryption, HMAC signing, and key derivation — the building blocks of secure systems. Every tool tagged here uses the Web Crypto API on your device, so secrets never leave the browser.
Decode JSON Web Tokens to inspect header, payload, and expiry.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
Generate HMAC signatures (SHA-1/256/384/512) from a message and secret key. Uses WebCrypto.
Encrypt or decrypt text with a passphrase using AES-GCM. Runs entirely in your browser.
Generate BIP39 seed phrases (12/15/18/21/24 words) offline in your browser. Useful for cryptocurrency wallets.