File checksum verifier — hash a file and compare
Pick a file (or paste text), compute its MD5, SHA-1, SHA-256 or SHA-512 checksum, and compare it to an expected value. It runs entirely in your browser (0 uploads, works offline) — your file never leaves your device.
How to use it
- Choose an algorithm and select a file, or paste text.
- The checksum is computed on your device.
- Paste an expected checksum to see whether it matches.
FAQ
How do I verify a file checksum for free?
Choose the algorithm, select the file, and paste the checksum the publisher provided. This page hashes the file in your browser and tells you whether the values match — with no upload.
Is my file uploaded anywhere?
No. The file is read and hashed entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi. That is the only way to check a private file's integrity safely.
Which algorithms are supported?
MD5, SHA-1, SHA-256 and SHA-512. Prefer SHA-256 or SHA-512 for security; MD5 and SHA-1 are useful only for matching legacy published checksums.
Why does a checksum matter?
It confirms a download arrived intact and unmodified. If the computed value matches the publisher's, the file is byte-for-byte what they released.
Limits
Verifies integrity against a checksum; it does not verify a cryptographic signature or the publisher's identity.
Related
The hash generator hashes text; the AES tool encrypts data.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.