Hash Generator & Verifier

Hash Generator: MD5, SHA-1, SHA-256, SHA-512 and Known Hash Lookup

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for text or files entirely in your browser, and check whether a hash matches a known file in the CIRCL hashlookup database. Hashes are used to verify downloads, detect tampering and identify known software or malware samples.

Hash Generator (All Algorithms)

Enter text to hash: Or upload a file:

Known Hash Lookup

Checks the hash against CIRCL’s public known-file database (NSRL-style), useful for identifying known software or malware files by hash. This does not crack passwords or reverse arbitrary hashes.

Enter MD5, SHA-1, or SHA-256 hash:

How to use it

Type text or choose a file, then press Generate Hashes.
Copy the algorithm you need.
To identify a file, paste its MD5, SHA-1 or SHA-256 hash into Known Hash Lookup.

Frequently asked questions

Which hash should I use to verify a download?

Use SHA-256 or SHA-512 and compare it with the value published by the vendor. MD5 and SHA-1 are fine for checksums but are no longer collision resistant.

Does the lookup crack passwords?

No. It only tells you whether a hash matches a known file in the CIRCL database, which is useful for malware triage.

Are my files uploaded?

No. Hashing happens locally in your browser.