There are a few ways to sign a PDF document.
- Sign a document freehand with the Scribble tool
- Sign a document with an image of your signature. This is most common. There are several ways you can apply it.
- Sign a document securely with a digital signature using a digital certificate. Certain legal and governmental bodies require this. See Using a Digital Signature below.
Adding a Basic Signature
You can also insert a scanned image of your signature into a PDF just as you would any other image. When you do, it's often necessary to make the background of the signature transparent.
- Scan your signature, crop it to size, and save it as an image file, such as JPEG, TIFF, or PNG.
- Drag and drop the image into the PDF from Finder. For other ways to insert an image see Adding Images.
- With the signature selected, choose Edit > Make Transparent Image...
- In the window that opens, use the eyedropper
- Click Make Transparent.
- If your signature appears too thin, choose Edit > Undo, and repeat Step 3 with decreased tolerance.
- Use resizing handles, with the Shift key held down to constrain proportions, to resize the signature to fit appropriately.
Tips for Adding A Signature
- Once you've added your signature to a PDF, you can save it in the Library
- If your scanned image is too large, you can crop it first. (Cropping Images).
Using an Interactive Signature Field
See Signature Fields.
Using a Digital Signature
See Digital Signatures.