Signing a PDF with a Photo of Your Handwritten Signature, No Printing Needed

Many people sign PDFs by printing, signing, and rescanning, or by drawing a signature with a trackpad that looks unlike their own. A simpler method is to photograph a signature made on white paper and let a PDF editor isolate the ink. In the osFoundry desktop app's PDF Editor, the photo is imported through the Fill & Sign panel, which removes the paper background and saves the signature for reuse. The signature is placed on the document as an editable stamp annotation, which is then flattened into the page content so it cannot be moved or removed in other readers. The approach produces an image of a signature rather than a cryptographic digital signature, so contracts requiring the latter need different tools.