🔐 Cryptography

Cryptography tools that run entirely in your browser. Keys and secrets you enter never leave your device.

Hashing

#️⃣ HashHash text, hex or files with MD5, SHA-1/2/3, Keccak, BLAKE2/3 and RIPEMD-160 🔏 HMACCompute an HMAC with any hash 🧂 Password HashHash and verify passwords with bcrypt, scrypt and Argon2

Key Derivation

🧬 Key DerivationDerive keys with PBKDF2 and HKDF

Encryption

🛡️ EncryptionEncrypt and decrypt with AES (GCM, CBC, CTR) and ChaCha20-Poly1305

Keys

🗝️ Key GeneratorGenerate Ed25519, X25519, P-256/384, secp256k1 and RSA keys 🔄 Key ConverterConvert keys between PEM, DER, JWK and raw bytes 🤝 ECDHCompute a shared secret with X25519, P-256 or secp256k1

Signatures

✍️ Sign & VerifySign and verify with ECDSA, EdDSA, Schnorr (BIP340) and RSA-PSS 🖋️ DER SignatureConvert a signature between raw (r, s) and DER

Certificates

📜 X.509 / CSR DecoderDecode a certificate or signing request 🌳 ASN.1 DecoderDecode ASN.1 DER or PEM into a tree

Secrets

🎲 Random GeneratorGenerate random bytes, passwords and passphrases 🧩 Secret SharingSplit a secret into shares and recover it (Shamir) ⏱️ TOTP / HOTPGenerate one-time codes from a secret

Math

➗ Modular ArithmeticModular inverse, power and GCD with big integers