Sign PDF: Add Signature Image to PDF

A PDF document can be signed by inserting an image file with a signature (e.g. scanned copy of a written signature save as a .PNG file with a transparent background).

This can be done using a handwriting note-taking software with PDF annotation support that is called Xournal++.

It is an open-source and cross-platform application that supports Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows.

In this note i will show how to install the Xournal++ and use it to sign a PDF by adding an image file with a signature.

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Add Signature Image to PDF

To install the Xournal++, follow the official instructions depending on your operating system:

Once installed, the Xournal++ can be started from an application menu or by running this command from a Linux/macOS terminal:

$ xournalpp

Open a PDF file that needs to be signed (Ctrl + O):

Top Menu -> File -> Open

Select an “Image” tool (Ctrl + Shift + I):

Top Menu -> Tools -> Image

Click on a place in the PDF document where you want to paste a signature.

Locate the file with the signature (e.g. signature.png) and click on “Open” to insert it.

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The signature can be moved or resized using a “Select Rectangle” tool (Ctrl + Shift + R):

Top Menu -> Tools -> Select Rectangle

Finally save the signed file as a new PDF document (Ctrl + E):

Top Menu -> File -> Export as PDF

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