This is a compliment to an article I linked to a few weeks ago which centered on using the iSight camera to sign documents in Preview. In Yosemite, you can now use the trackpad of your computer to sign documents as well. One thing the article doesn’t mention is you can use a stylus if you like (the same one you use with your iPhone or iPad) if you want a more accurate signature than your finger can provide.

Read more at OSXDaily