Press “File” → “Create New Document” and name it. 2. Now select the PDF file “example.” 3. Go to “Document Properties'' and then select “Page” in the Properties table 4. Under “Page Text Color” set the color “Black”. This color will be used as fill. 5. In order to fill the pages, go to “Page Setup” and set the document size to 20 × 20 cm. Note: In Step 4 for the PDF-Fill mode, there is a “fill color” option to pick the fill color. Also in Step 5, you have the size as an option. 6. Close the PDF and check to see that the fill color you've set works. Why Open-Xchange Editor is the best solution for PDF editing? — PDF Viewer, which is included in the PDF Change Plus bundle, works best for a PDF document only (which is most of the cases). — The PDF Form Designer is a “quick and easy” tool based on the “quick and easy” principle. You'll quickly be able to convert and edit an existing document. — Once you are familiar, it's super easy to switch to edit your PDF document using the Open-Xchange Editor. — It has a full suite of tools for converting, editing, managing, and formatting PDF. — It's completely compatible with all current Open-Xchange Viewers. This includes the Windows and Linux versions of PDF Change Plus and Open-Xchange PDF Viewer. — Once you download the Open-Xchange Editor, you don't have to update the software every time you want to convert or edit a PDF file.