Editing PDFs

For everyone wanting to do that:

1. Don’t. PDFs are made for printing and viewing. If possible, edit Text documents not PDFs.
2. For merging, removing, rotating, rearranging pages: PDFarranger, really stable and awesome tool even for 500+ pages
3. For adding Text or marking: Firefox, then Okular. Okular Flatpak has full portal support (does not need any filesystem permission)
4. For censoring stuff: GIMP. Just marking with black is not secure, you need to edit the image! If it is text, use Libreoffice Draw
5. Adding Signatures: Okular, Firefox (I think?)
6. For actually changing stuff in the PDF: Libreoffice Draw