Retypo edits the text inside a PDF on your phone, including scanned ones. Tap a line, retype it, and the new text keeps the font and look of the original instead of a white patch pasted over it. Everything runs on the device: no account, no upload. It also fills in and signs forms, redacts (the text is deleted, not just covered), scans with the camera, merges and locks PDFs, and converts them to Word, Excel, PowerPoint and EPUB. Free to use; Premium is yearly or a one-time purchase.