1. Preview App
2. Mac Preview App Did Not Save Images

On Mac: Preview version 9.0 (macOS Sierra) can remove the alpha channel if you export or save the image. Preview version 10.0 (944.2) (macOS High Sierra) does not remove the alpha channel. Both Export and/or Save does not remove the alpha channel from the image.

Preview User Guide

Some PDFs are forms you can fill out and then print or send. If a form requires a signature, you can add your signature to any PDF. Free children's book publishing software for mac.

Fill out a PDF form

1. In the Preview app on your Mac, open the PDF form.

2. Click a field in the form, then type your text.

If you save the form (by choosing File > Export), you can close it, open it later, and continue to fill it out.

Create and use signatures

To sign PDFs, you can capture your signature using your trackpad, the built-in camera on your Mac, or iPhone or iPad.

1. In the Preview app on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button , then click the Sign button .

2. Follow the onscreen instructions to create and save your signature.

   • Create a signature using your trackpad: Click Trackpad, click the text as prompted, sign your name on the trackpad using your finger, press any key, then click Done. If you don’t like the results, click Clear, then try again.

     If your Mac has a Force Touch trackpad, you can press your finger more firmly on the trackpad to sign with a heavier, darker line.

   • Create a signature using your computer’s built-in camera: Click Camera. Hold your signature (on white paper) facing the camera so that your signature is level with the blue line in the window. When your signature appears in the window, click Done. If you don’t like the results, click Clear, then try again.

   • Create a signature using your iPhone or iPad: Click iPhone or iPad. On your iPhone or iPad, sign your name using your finger or Apple Pencil. When your signature appears in the window, click Done. If you don’t like the results, click Clear, then try again.

3. Add the signature to your PDF.

   Choose the signature you want to use, drag it to where you want it, then use the handles to adjust the size.

If you use iCloud Drive, your signatures are available on your other Mac computers that have iCloud Drive turned on.

Preview App

Delete a saved signature

Mac Preview App Did Not Save Images

1. In the Preview app on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button .

2. Click the Sign button , then click the X to the right of the signature you want to delete.