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Compare File Checksums

Calculate a file’s SHA-256 checksum. Compare two files or check a trusted expected hash locally, without uploading their contents.

Processed on your deviceFree · No account needed

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How to use it

  1. Choose the file you want to check.
  2. Optionally select a second file or paste an expected SHA-256 checksum from a trusted source.
  3. Calculate, read the comparison and copy or download the checksum if needed.

Example: The bundled example files both contain exactly abc. Despite different filenames, both produce SHA-256 starting ba7816bf8f01cfea.

Details & limits

Up to two files, each at most 50 MiB. SHA-256 only; expected values need exactly 64 hexadecimal characters. HTTPS and browser cryptography support are required.

Does a matching checksum prove a file is safe?

No. It checks file bytes, not whether the content is trustworthy or free of malware. Comparing against a checksum is useful only when the expected value comes from a trusted source. Visually identical documents may have different bytes and therefore different checksums.

Different names can contain the same bytes

A filename is not a content check. Two differently named copies can produce the same SHA-256, while two visually identical PDFs can differ because of their internal data. Select the files themselves to calculate their hashes locally. For a published download, obtain the expected checksum from a trusted source. A matching hash does not establish that a file is safe or that its author is trustworthy.

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