How do I add my own handwritten signature to a PDF file on a Mac? After Mac OS X Lion, the system comes with a "preview" feature that allows you to add a handwritten signature to your PDF file in a few easy steps. The following small series to introduce you to the following specific steps:
1. Find a blank sheet of paper (without any pattern) and sign your name.
2. Open Preview, select Preferences
3, Preferences set the last "signature", select Click Create Signature
4, this time will pop up a camera window, your signature to the camera, the camera preview window will have a blue line, note that all of your writing must be above the blue line. Your signature preview will appear on the right. Adjust to the appropriate position, select, accept.
5, at this time in the main PDF window, click on the "Edit" button, a row of options, click on the "signature" option and drop down to select your signature, the document appears the crosshairs, drag.