PDF Signature Check

Read the signature fields of a PDF: who signed, when, why, and how much of the file the signature actually covers.

PDF documents Client-side Signature /V dictionary + signed byte-range coverage

Tool preview

How to use it

! The certificate chain is not verified here; the tool reads the signature dictionary and measures the signed byte range.
! Only AcroForm signature fields are found; a digitally certified but unsigned document may show none.
! A low coverage percentage means content sits outside the signed range — it may have changed after signing.

Does a signed field prove the document is authentic?

Not by itself. The signature must be verified against the signer certificate by a trusted application.

What does the coverage percentage mean?

It is the share of the file inside the /ByteRange the signature protects. Anything outside that range is not covered by the signature.

Is the PDF uploaded?

No.

Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.

Inspect a PDF author, producer, creation date and XMP data.

Delete the author, producer, timestamps and XMP from a PDF.

Permanently delete the text instead of covering it with a black box.