Server-Side PDF Verification
NUBSEAL
PDF Integrity & Anti-Tamper Check
Upload a sealed PDF to verify digital seal integrity, QR payload, and detect tampering instantly.
Click to select a PDF or drag it here
PDF Verification Test Files
Download sample PDFs to test different verification outcomes.
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Verified File
A server-sealed file that has not been modified after sealing.
⚠️
Tampered File
A sealed file whose text was later modified by PDF editors.
🛑
Re-created Copy
An attempt to forge the seal by copying signatures to a new file entirely.