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Signature checks

Real verification of every signature in a PDF — what the certificate claims about the signer, what the signature actually covers, whether the sealed bytes still match, and what happened to the file afterwards.

Signed PDF

Drop a PDF here, or click to browse

Verification uses the certificates carried inside the file. Chain trust against a root store and revocation are not evaluated — an intact signature proves the document is unchanged, not who the signer is. Advisory only, nothing stored.

Choose a PDF to verify its signatures.

Compare two signature marks

Geometric similarity of two signature images — ink overlap, shape, and stroke directions after normalization. Not handwriting identification: genuine signatures vary, traced forgeries can score high. A comparison aid, never proof.

Signature A — drop or click
Signature B — drop or click

Add two signature images to compare.

From an existing scan

Signature presence and byte-range checks already run on every full analysis — pick a scanned document to see what it found.

Choose a scanned document above.