How to Add a Signature to a PDF File on a Mac

Time needed: 2 minutes

To insert a handwritten and scanned signature to a PDF document on a Mac using Preview:

1. Create a signature for use in Preview.

2. Show the markup or the form filling toolbar.

   Here’s how: Click Show markup toolbar or Show form filling toolbar in the normal Preview toolbar; if you see Hide markup toolbar instead, for instance, the toolbar is already visible.
   Preview keyboard shortcut: Press Command Shift A to show and hide the markup toolbar.

3. Click Sign in the markup or form filling toolbar.

   Menu alternative: You can also always select Tools | Annotate | Signature from the menu.

4. Select the desired signature to insert it into the document.

   Pick the page: Go to the page on which the signature should appear before inserting so you do not have to move it too much around.
   

5. Position the signature in the desired location.

   Here’s how: Use three finger drag to move the signature into position and the handles to change its size; hold Option while you resize to keep the signature centered in its original spot.
   Rotate: To rotate the signature, twist two fingers on a trackpad with the signature selected.

6. Optional: Change the signature’s color.

   Here’s how: In the markup toolbar, click Border color, then pick the color you’d like to use for the signing ink.
   Local color: Select Show Colors… to pick a color from the document (or elsewhere on the screen) using the pipette.