Okularĭeveloped by the KDE opensource community, Okular is a multi-platform document viewer that is fully free and licensed under the GPLv2+. In this guide, we have put together a list of PDF editors (both free and proprietary) that you can leverage to modify your PDF documents.
Occasionally, you might want to modify your PDF and maybe add text, images, fill forms, append a digital signature, and so on. You can seamlessly view a PDF document across multiple devices without visual alteration of its contents. The PDF file format is one of the most widely used document formats that is used to attach, transfer and download digital files thanks to its ease of use, portability, and ability to preserve all elements of a file.
