If you've ever been asked to sign a PDF file, you know how tedious that can be. You have to print the PDF, sign it, then scan the PDF back into your computer so you can mail it back to the recipient. But with Preview, Mac users can easily capture their signature with their Mac camera and then use that to sign documents. Here's how to sign a PDF with the macOS Preview app.
1. Double click the PDF you need to sign to open the Preview application.
2. Navigate to Tools > Annotate > Signature > Manage Signatures
3. Sign your name on a white sheet of paper and hold it up to the camera, or sign your name on the trackpad to save and add the signature.
4. Go to Tools > Annotate > Signature and choose your signature to insert it in the PDF.