Mac OS Preview has a nice feature that can create a digital version of your signature and use in your PDF document files. It is easy to create the digital signature in Mac. You can use this signature in all the documents in your Mac.

Create signature image with trackpad or mouse Creating your signature image with Signature Maker is as simple as drawing and sketching on a piece of paper. Quicktime. Just use your finger or a stylus, sign your name using the built-in multitouch trackpad, mouse, or Magic Trackpad. You can easily get your digital signature in PNG image file with transparent background. Whenever you got a digital document that requires your signature, you don't bother printing, filling, scanning or faxing. Just insert your signature image, save you lots of hassles.