Free tools

PDF hash checker (SHA-256)

See a file's SHA-256 fingerprint and check it against the one you expect.

Choose a file to see its SHA-256.

The file is read in your browser. It is never uploaded.

Questions

What is a SHA-256 hash?

A 64-character fingerprint of a file. If even one byte of the file changes, the fingerprint changes completely. Matching hashes mean the files are identical.

How do I check a SignKaro document?

The certificate page of every signed SignKaro PDF lists the "Original document SHA-256". Check the file the sender uploaded here, and the hash should match that line exactly.

Is my file uploaded?

No. Your browser reads the file and computes the hash on your device with the Web Crypto API. Nothing is sent to SignKaro.

Does it work for files other than PDFs?

Yes. It works for any file type. Very large files can take a few seconds.

More free tools

Signature generatorType or draw your signature and download it as a transparent PNG.Free contract templatesFill in the blanks and send for signature.All free toolsSmall tools for signing and checking documents.

Get your next contract signed with a full audit trail.

Start free

Free during early access: every feature, including team members, branding, bulk send, and audit export. AI drafting is limited to 10 actions a month for each person.