Hash Generator
Compute the MD5, SHA-1, SHA-256, SHA-512 and CRC32 of any text in one click — or add a secret key to compute a keyed HMAC (HMAC-SHA256 and friends). Useful for checksums, data integrity and signing. Runs on the server for that request only; nothing is stored.
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Frequently asked questions
What is a hash?
A hash is a fixed-length fingerprint of some data. The same input always produces the same hash, but you cannot reverse a hash back into the original text. Hashes are used to verify file integrity, index data and store password verifiers.
Which algorithms are shown?
This tool outputs MD5, SHA-1, SHA-256, SHA-512 and a CRC32 checksum for your input at once, so you can copy whichever your task needs.
What is the HMAC secret key field?
Leave it empty for a normal (unkeyed) hash. Enter a secret key and the tool computes an HMAC instead — a keyed hash that proves a message came from someone who knows the key. HMAC is what signs things like webhooks and HS256 JWTs (HMAC-SHA256). CRC32 has no HMAC form, so it is omitted in keyed mode.
Should I use MD5 or SHA-1 for security?
No. MD5 and SHA-1 are broken for security use (collisions are practical) — they are fine only as non-security checksums. For anything security-sensitive use SHA-256 or stronger, and for passwords use a dedicated algorithm like bcrypt/argon2, not a raw hash.
Is my text sent anywhere or stored?
It is sent to the server to compute the hash for that one request and nothing is stored in a database or log. Do not paste secrets you do not want to transmit.
Why is the same text giving the same hash?
That is by design — hashing is deterministic. Identical input always yields identical output, which is exactly what lets you verify that two pieces of data match.