PDF Signature Verifier

Indian government PDFs — e-PAN from the Income Tax portal, e-Aadhaar, digitally signed certificates and challans — carry a Digital Signature Certificate (DSC) that proves the document came from the issuing authority and has not been altered since. The problem is that most PDF readers on phones, and many desktop readers, either do not check that signature or show a warning that looks alarming but means nothing.

This tool reads the signature embedded in the PDF and shows an Adobe-style validity mark right on the signature field: green when the signature is valid and the document is unmodified, yellow when the signature is present but the certificate chain cannot be fully established in this environment, and red when the document has been changed after signing.

That last case is the one that matters. A PDF that was signed and then edited — a figure changed, a name corrected, a page swapped — fails verification, and that is exactly what an office accepting the document is checking for. Verifying before you submit tells you whether a downloaded document is genuinely the issued one, and verifying a document someone hands you tells you whether it has been tampered with.

After verifying you can preview, print, or download the verified copy with the validity mark visible, which is useful when an office wants to see the verification rather than take your word for it.

Verification takes a few seconds.

Step 1: Upload the signed PDF
Drag the file in or click the upload zone. Use the original downloaded file — not a printout that was rescanned, and not a copy that has been through an editor, because both destroy the signature.

Step 2: Read the validity mark
Green means the signature is valid and the document has not been modified since signing. Yellow means a signature is present and the content is intact, but the issuing certificate could not be fully chained in this environment — common with some government certificate authorities and not by itself a sign of a problem. Red means the document was changed after it was signed.

Step 3: Check the signer details
The signature panel shows who signed it and when. Confirm the signer is the authority you expect — a valid signature from the wrong entity is still the wrong document.

Step 4: Preview, print or download
Take a copy with the validity mark shown, so the office can see the verification result rather than having to run it themselves.

Always verify the original downloaded file. Printing and rescanning a signed PDF destroys the signature — the paper copy carries no cryptographic proof at all, which is why offices increasingly ask for the digital file.

Do not edit a signed PDF. Compressing it, adding page numbers, watermarking it or rearranging pages will all break the signature. If you need a compressed version for an upload limit, keep the signed original separately and verify that one.

Understand yellow. It usually means the certificate chain could not be fully established here, not that the document is suspect. Check the signer details and whether the content is reported as unmodified before assuming there is a problem.

Take red seriously. A document altered after signing is exactly what verification exists to catch. If a red result appears on a document someone gave you, ask for a freshly downloaded original.

Verify before you submit, not after a rejection. It takes seconds and tells you whether the file you are about to upload is the issued one.