A hash is a fixed-length fingerprint computed from any input. The same input always produces the same hash, but the hash cannot be reversed back into the original data. Hashes are used to verify file integrity, store passwords safely, and sign messages.

Is MD5 still safe to use?

MD5 is broken for security purposes — collisions can be manufactured — so never use it for passwords or signatures. It remains fine for non-security uses like checksums, cache keys and deduplication. For anything security-related, use SHA-256 or HMAC-SHA256.

What is the difference between SHA-256 and HMAC-SHA256?

SHA-256 hashes the input alone. HMAC-SHA256 combines the input with a secret key, so only someone who knows the key can produce or verify the hash — that's what APIs use to sign webhooks and requests.

Is it safe to hash sensitive text here?

Yes. Hashing runs entirely in your browser using the Web Crypto API — your text and keys never leave your device and nothing is stored on any server.

Hash Generator

Generate MD5, SHA-256, and HMAC-SHA256 hashes

100% Private — your data never leaves your device

Your text is hashed entirely in your browser — it is never uploaded, logged, or stored anywhere.

Hash Generator

Generate cryptographic hashes for your text

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About Hash Functions:

MD5: 128-bit hash (not recommended for security)
SHA-256: 256-bit secure hash algorithm
HMAC-SHA256: Hash-based message authentication with secret key