Type into a form, add text anywhere, tick boxes, and drop in a signature — then save a flattened copy. This adds things on top of the page; it doesn't edit the text that's already there.
Choose a PDF
Drop a PDF hereor click to choose a file
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Pick a tool, then click on the page to place it. Drag to move, drag the yellow corner to resize, click the × to delete. Double-click text to edit.