Modify Sign Document on Linux For Free

If you want to make extensive changes to a file signed by someone else or annotate, sign, or convert a locked (read-only) file, your best option to edit a digitally signed PDF is to contact the person who signed it and request the signature to be removed, receive an unsigned copy of the file, or to have them send you ...

How to Edit a Signed PDF with Google Docs Upload your signed PDF to Google Drive. Open the PDF in Google Docs. Make your edits. Press File. Press Download. Select PDF Document.

Inkscape. Inkscape is a popular open-source vector graphics editor that also functions as a PDF editor for Linux. It offers a wide range of features specifically designed for editing PDF documents. With Inkscape, you can import, edit, and export PDF files effortlessly.

Once a PDF has been digitally signed, it is usually impossible to edit without compromising the signature. And it's precisely the purpose of an electronic signature not to be able to tamper with a signed document! However, in some cases, it is possible to amend the file in a way that keeps the original signature valid.

When you sign a PDF using your digital ID, the PDF becomes read-only for others. If you received a PDF digitally signed by others, you can sign it, but can't edit it. While signing a PDF, if the signer chooses to lock the document after signing, the document becomes read-only for everyone, including the signer.

Digital signatures work by hashing the file being signed and combining that hash with the signer's public key: once the file is changed, the hash will change and the signature will be invalidated. If you want to edit the document you'll need to create a new copy.

If you want to make extensive changes to a file signed by someone else or annotate, sign, or convert a locked (read-only) file, your best option to edit a digitally signed PDF is to contact the person who signed it and request the signature to be removed, receive an unsigned copy of the file, or to have them send you ...