Your files stay on your device

Hashing and encryption tools

Hashes and checksums for text or files, bcrypt and Argon2 password hashing, HMAC, and AES encryption, computed entirely in your browser.

9 tools

- Hash generator

SHA-2, SHA-3, Keccak, BLAKE and legacy checksums, for text or files.
 (/crypto/hash)
- Password strength

Score a password with zxcvbn, the guessing model, with matched patterns shown.
 (/crypto/password-strength)
- HMAC

Keyed MACs over text: SHA-1/256/384/512 through WebCrypto, keys as text/hex/base64.
 (/crypto/hmac)
- bcrypt

Hash with bcryptjs at cost 4 to 15 in a disposable worker; verify against a pasted hash.
 (/crypto/bcrypt)
- Argon2id hasher

Password hashing with presets, bounded custom parameters, PHC output, and verify.
 (/crypto/argon2)
- AES-GCM encrypt

Authenticated encryption with raw keys or PBKDF2 passphrases and a versioned envelope.
 (/crypto/aes-gcm)
- Key generator

RSA, ECDSA, ECDH, and Ed25519 key pairs exported as JWK and PEM.
 (/crypto/key-generator)
- HKDF deriver

RFC 5869 extract-then-expand key derivation with explicit salt and info.
 (/crypto/hkdf)
- Checksum manifest

sha256sum-style multi-file verification with missing, extra, and per-line errors.
 (/crypto/hash-manifest)

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Canonical HTML: https://nutter.tools/crypto/
Markdown version: https://nutter.tools/crypto/index.md
Plain-text version: https://nutter.tools/crypto/index.txt
Agent index: https://nutter.tools/llms.txt