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?***


  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?

  • I believe that you can do that in LibreOffice, although I am not sure of the details.
    – Eagle_Mike
    Mar 11, 2021 at 16:26
  • pdftk, PDF ToolKit might help. Read man pdftk
    – waltinator
    Mar 11, 2021 at 16:30
  • @Eagle_Mike the signature line method is in libre office writer, pdf opens in libre office draw
    – Sayan Dey
    Mar 11, 2021 at 17:23

2 Answers 2


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.


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


$ 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?

  • Thanks I just tried this out, exactly what i want except the ux is a bit difficult to work with.
    – Sayan Dey
    Feb 14, 2022 at 5:49
  • There's a spanish open source signature tool called AutoFirma which can: sign pdfs, binary and xm files with advanced signatures (complying PAdES, CAdES and XAdES standards) and verify those signatures.
    – erny
    Mar 27 at 17:26

I think you can do something like that on Gimp, potentially with a picture of your signature that you scan

  • 2
    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. Oct 22, 2021 at 18:43
  • 1
    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, 2022 at 9:39

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