Rather than one crowded editor, each job has its own tool. Edit PDF changes or deletes the words already in the file, inside the file itself. Add text to PDF writes new words anywhere on a page, and Fill a form types answers into the boxes of a fillable form. Sign PDF adds a signature you draw, type or upload. Add an image places a logo or a stamp, and Annotate PDF highlights, draws and leaves notes.
To finish a document, Add page numbers, Header and footer and Add watermark put the same mark on every page. Flatten PDF makes form answers part of the page, Edit PDF metadata changes the title and author the file reports, and Compare two PDFs shows what changed between two versions.
Arabic is treated as a first language, not an afterthought: letters are joined, lines run from the right, and Arabic mixed with English or numbers stays in reading order, so these tools suit Arabic documents as well as English ones. One honest limit: a signature made here is a picture of your signature, not a certified digital signature.