A new text block can be added anywhere on the page (font, size, and color are configurable), and existing text can be edited in place – fix a typo in a header, correct a date, append a missing word. The highlight tool works like a paper marker: drag across lines to color them. The Comment tool drops a sticky note in the margin for a colleague.
Shapes include rectangle, ellipse, arrow line, and polygon (triangle, diamond, pentagon, hexagon, star), plus freehand drawing with three brushes: round, square, and marker. Stroke width, color, fill, and line style (solid, dashed, dotted) are adjustable for every shape. A separate Erase Area tool overlays a white rectangle on top of content – the safest way to hide personal data before publishing a scan.
Pages can also be edited in place: rotate a single sheet by 90/180/270° or delete an unwanted page – a blank cover after scanning, for example. Every action goes into a history with Undo/Redo, so experimenting is safe: a wrong step rolls back, and the source PDF stays untouched until you save.