pdfsig - Man Page

Portable Document Format (PDF) digital signatures tool


pdfsig [options] [PDF-file] [Output-file]


pdfsig verifies the digital signatures in a PDF document. It also displays the identity of each signer (commonName field and full distinguished name of the signer certificate), the time and date of the signature, the hash algorithm used for signing, the type of the signature as stated in the PDF and the signed ranges with a statement wether the total document is signed. Moreover, with option -sign it can sign a PDF document.

The signer certificate validation uses the trusted certificates stored in the Network Security Services (NSS) Database. The NSS Database is searched for in the following locations:


-nssdir [prefix]directory

Specify the database directory containing the certificate and key database files. See certutil(1) -d option for details of the prefix. If not specified the other search locations described in Description are used.


Do not validate the certificate.


Dump all signatures into current directory. -sign  number Sign the document in the signature field with the given number.

-nick  nickname

Use the certificate with the given nickname for signing.

-kpw  password

Use the given password for the signing key (this might be missing if the key isn't password protected).

-digest  algorithm

Use the given digest algorithm for signing (default: SHA256).

-reason  reason

Set the given reason string for the signature (default: no reason set).


Create a signature of type ETSI.CAdES.detached instead of adbe.pkcs7.detached.


Print copyright and version information.


Print usage information. (-help and --help are equivalent.)


The pdfsig software and documentation are copyright 1996-2004 Glyph & Cog, LLC and copyright 2005-2015 The Poppler Developers - http://poppler.freedesktop.org

See Also

pdfdetach(1), pdffonts(1), pdfimages(1), pdfinfo(1), pdftocairo(1), pdftohtml(1), pdftoppm(1), pdftops(1), pdftotext(1) pdfseparate(1), pdfunite(1) certutil(1)

Referenced By

pdfattach(1), pdfdetach(1), pdffonts(1), pdfimages(1), pdfinfo(1), pdfseparate(1), pdftocairo(1), pdftohtml(1), pdftoppm(1), pdftops(1), pdftotext(1), pdfunite(1).

28 October 2015