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Any SignSecure PDF. We compare its fingerprint to our tamper-proof record and show you exactly who signed, when, and whether a single character has changed.

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Verified · Untouched
Contract-2026-11.pdf
Signed by 3 · 2 hours ago
Drag & dropAny SignSecure PDFFingerprint matchFull signer chainTamper-evidentFree foreverDrag & dropAny SignSecure PDFFingerprint matchFull signer chainTamper-evidentFree foreverDrag & dropAny SignSecure PDFFingerprint matchFull signer chainTamper-evidentFree forever
1 char
Detects an edit as small as a single character anywhere in the document.
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Free and account-free. Verify anything you receive, anytime.
Chain
Full signer chain with time and location of every signature.
How it works

Proof, on demand. Every document.

  1. 01 —

    Drop the file in

    Any PDF signed with SignSecure. No account, no upload limits, no waiting room.

  2. 02 —

    We fingerprint it

    The document is hashed and compared against our tamper-proof record within seconds.

  3. 03 —

    See the signer chain

    Every signer, every timestamp, every device — the full audit surface, human-readable.

  4. 04 —

    Trust it or don't

    Green if untouched. Red if a single character has changed. No middle ground.

Verify

The receipt for every promise.