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Adobe Acrobat DC on windows support this feature. While snap package adobe acrobat is partially functional on linux, as it logs incompatibility message.

So actually I am looking for signing my offer letter pdf for joining I want to do it on ubuntu 20.04. Is there any software (long term supported) for that?***

Requirement:

  1. I will be putting my name in the signature in text or image form.
  2. The whole thing will get digitally signed by some encryption algorithm.

Mostly what I am getting is merely signing and securing the document but not a visible signature. Any wayout?

Sayan Dey
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2 Answers2

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Not recommended (options 1): use deb installation commercial Foxit https://www.foxit.com/pdf-editor/ or online solution.

Not recommended (options 2): long way to install w$ on VirtualBox and use the latest Abode Reader DC or try to use deb installation Adobe Reader 9.

Recommended (options 3): In Ubuntu install apt-get install xournal add annotate picture as sign and sign all document by yours pgp key.

Sign:

gpg --clearsign --output=sign_file.pdf file.pdf

Verify:

$ gpg --verify sign_file.pdf

gpg: Signature made czw, 3 lut 2022, 12:45:58 CET
gpg:                using RSA key 14644CCD80A59C3A15E226568C199B37E09FA079
gpg: Good signature from "xxxxx" [ultimate]
gpg:                 aka "xxxxxx" [ultimate]

You can add this command to filemanager-actions

Credit: How do I digitally sign a PDF with a S/MIME certificate?

Zanna
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C2RLOS
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  • Thanks I just tried this out, exactly what i want except the ux is a bit difficult to work with. – Sayan Dey Feb 14 '22 at 05:49
  • There's a spanish open source signature tool called [AutoFirma](https://firmaelectronica.gob.es/Home/Descargas.html) which can: sign pdfs, binary and xm files with advanced signatures (complying PAdES, CAdES and XAdES standards) and verify those signatures. – erny Mar 27 '23 at 17:26
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I think you can do something like that on Gimp, potentially with a picture of your signature that you scan

OdaKah
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    Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – ThunderBird Oct 22 '21 at 18:43
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    Digital signiture is signing a document with encryption involved, whereas e-signiture is putting an electronic version of a signiture (same as siging on paper, but using electronic equipment to produce it) that you are refering to. The OP is looking for digital signiture. – Shobeira Nov 23 '22 at 09:39