Generate a hash
MD5, SHA-1 and SHA-256 checksums for text or a file, computed on your device.
A hash is a fingerprint: the same input always gives the same string, and any change gives a completely different one. That makes it the standard way to check that a downloaded file arrived intact, or that two copies really are identical.
Type or paste text to hash it as you type, or pick a file to fingerprint the file itself. SHA-256 is the sensible default; MD5 and SHA-1 are here because checksums published years ago still use them.
File hashing happens on your device, so hashing a 2 GB install image doesn’t mean uploading a 2 GB install image.
How to use it
- Paste your text, or choose a file.
- Pick the algorithm (SHA-256 by default).
- Copy the hash and compare it with the one you were given.
Frequently asked questions
Should I still use MD5?
Only for comparing against an existing MD5 checksum. It’s broken for security purposes — two different files can be made to share an MD5 — so for anything that matters, use SHA-256.
Can I get the original text back from a hash?
No. Hashing is one-way. Short or common inputs can be guessed from precomputed tables, which is why passwords need salting and a slow hash, not a plain SHA-256.
My hash doesn’t match the one on the site.
Check you’re comparing the same algorithm, and that the download completed. A single changed byte changes the whole hash — that’s the point.
How big a file can I hash?
The file is read into memory, so very large files depend on your device. A few gigabytes works on a desktop; a phone will manage less.
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