About File Hash Checker

Hash Check computes the checksum of a file or a piece of text and compares it to the value a download page published. A green line means the download arrived intact; a red line means it did not.

The file is read with the browser File API and hashed with the built-in Web Crypto API, all on your device. Nothing is uploaded.

How to use it

  1. Choose 'A file' and drop your download in, or choose 'Text' and paste a string.
  2. Select the algorithm the source used. SHA-256 is the common one.
  3. Read the digest, or press Copy to put it on the clipboard.
  4. Paste the published value into 'Expected value'. A whole sha256sum line works; the tool finds the hash in it.
  5. Check the result line: green for a match, red for a mismatch, amber if the value fits a different algorithm.

Common questions

Is the file uploaded to check it?

No. Hashing happens in the page with the Web Crypto API. The file stays on your device.

Why is there no MD5?

Modern download pages publish SHA-256. MD5 and SHA-1 are kept out for file verification; SHA-1 is offered only for legacy checksums.

Can I paste a sha256sum output line?

Yes. Paste the whole line and the tool extracts the hash, ignoring the filename after it.

Does a large file work?

Yes, it is hashed in one pass. Very large files take a few seconds and use memory while they run.