How to Sign Documents with Mac Trackpad Using Preview for Mac OS X
The Mac Preview app has long included the ability to digitally sign documents with a signature, but up until the most recent versions of Mac OS X, users had to basically sign a piece of paper and then use the Macs front-facing camera to ‘scan’ and digitize the signature. That has changed with modern releases of Mac OS, and if your Mac is running Sierra, El Capitan, Yosemite, or newer, you can now sign documents using just a trackpad.