On this page, you will learn how to digitally sign PDF documents with LibreOffice.

For a digital signature you need a personal user certificate. The application for a personal user certificate is done via the RA portal. Afterwards you must import the issued certificate into the certificate store.

• On Windows, LibreOffice accesses the Windows certificate store.
• On Linux you can use a certificate manager (e.g., Kleopatra, Seahorse, GPA or KGpg).

Please note:
Group certificates or the digital ID of group certificates, as they are, for example, issued for functional email mailboxes, must not be used for digital signatures because they generally do not meet the requirement of being assignable to a single person.

To digitally sign documents in LibreOffice, follow these steps:

1. Open a LibreOffice application (e.g., Writer).
2. Create the document and save it before signing.
3. Navigate to File > Digital Signatures > Digital Signatures.
4. Click on Sign Document.
5. A window for certificate or key selection opens. If another window opens in the background, you can close it with Esc.
6. Select the appropriate certificate or key pair and optionally add a description for the signature.
7. Click on Sign and then on Close.

The document has been digitally signed and you can close the document.

Additional information:

• Digitally sign documents in Adobe Acrobat
• Digitally sign documents in JSignPDF