Verify a PDF digital signature: ICP-Brasil, gov.br, e-Notariado and Registro Civil
Drag in the signed PDF and see who signed, whether the chain is recognised, whether the certificate was revoked, whether there is a timestamp and, above all, whether anyone changed the document after signing. The file never leaves your browser.
✓ no upload✓ unlimited use✓ annual plan! in testing
The document is processed in your browser and is never sent anywhere.
How it works
A PDF digital signature (PAdES standard) stores a cryptographic digest of part of the file and the signer's certificate. Verifying means recomputing that digest, checking the signature with the certificate's public key, following the chain to a recognised root authority and consulting revocation lists. ARU PDF does all of this in the browser and also examines, object by object, what was added to the file after each signature.
- 01Select the file
Drag the PDF into the tool area or click to choose it. It stays in your browser's memory only.
- 02Local processing
The PDF engine runs on your computer, in JavaScript and WebAssembly. Nothing is sent; you can watch the Network tab.
- 03Download the result
The finished file is saved straight from the browser to your disk. Close the tab and no copy remains anywhere.
Frequently asked questions
Does it verify gov.br signatures?
Yes. The Brazilian federal government root is recognised, as are every current ICP-Brasil root, ICPEdu, e-Notariado and the civil registry PKI (Registro Civil do Brasil).
What does "changed after signing" mean?
That additions were made to the file that change the document after the signature. The tool shows what changed and offers to download the version exactly as it was signed.
Do I need an internet connection?
Only to download the issuers' public revocation lists. Your PDF is never sent at any point.
Does it work with several signers?
Yes. Each signature gets its own card, and each one's coverage of the final file is shown separately.