PRIVACY / FREE TOOL

Document fingerprint

Hash files and check whether their contents changed.

On this device

Drop your files here

Or choose files. Up to 100 MB per file.

Choose files

Make it yours

Hash algorithm

Recommended integrity hash for checking whether a file changed.

Compare options

Choose the digest used to identify this file. SHA-256 is recommended; older formats are supplied for compatibility.

SHA-256: Recommended integrity hash for checking whether a file changed.
SHA-1: Legacy hash for compatibility. Do not rely on it for strong security.
MD5: Legacy checksum for compatibility. Do not rely on it for strong security.

Expected fingerprint

Paste a known hash to compare with the current file. Even a one-byte change produces a different hash.

Optional recipient provenance tag

Optional provenance label for your records. A label/hash does not prove who leaked a file.

Choose a file to begin.

No platform watermark is added. Your source files stay unchanged.

Add files and choose a hash algorithm. SHA-256 is recommended.
Compare against a known fingerprint to detect changes. Hashes/provenance labels do not identify who leaked a document.

Where are my files processed?

The badge shows the selected processing location. Local jobs stay on this device. Cloud jobs require the cloud option and use temporary storage.

How do I save the result?

When the tool finishes, preview the result and use Download. Your original files stay unchanged. Use ZIP to save a batch together.

How do I clear my workspace?

Use Privacy & local data in the sidebar. AI keys can be forgotten separately from AI settings.

How did this tool work for you?