Verify a PDF Digital Signature

Upload any PDF and we'll check every embedded digital signature — PAdES and PKCS#7 — and report whether each one covers an unmodified byte-range. Your file is processed in memory and discarded the moment the response is returned.

PDF to verify

Click to choose a PDF or drag one here

Maximum 10 MB · .pdf only

The file is never saved to disk or shared with third parties.

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This public tool checks cryptographic integrity only. It does not validate certificate authorities, expiry dates, or revocation status. Results indicate whether the signed byte-range has been modified since signing — not whether the signer is trusted.