![](https://help.apple.com/assets/63599ACE3A2E3C21301FEA6A/63599AD33A2E3C21301FEA71/en_US/67b42e1eeb7bbfca6279218dff8b9ba1.png)
![The signature tool in Preview.](https://help.apple.com/assets/63599ACE3A2E3C21301FEA6A/63599AD33A2E3C21301FEA71/en_US/83168fdca018b1d69761cc135a194821.png)
Fill out and sign forms right on your Mac
You don’t need to print PDF forms. Just use the Markup tools to fill in the form and even add a signature.
![A password-protected PDF.](https://help.apple.com/assets/63599ACE3A2E3C21301FEA6A/63599AD33A2E3C21301FEA71/en_US/ae5a05c91254fef2789d00f1187ad6b6.png)
Protect your confidential documents
If a PDF contains sensitive information, you can keep it secure by adding a password.
![A page thumbnail from one PDF to the sidebar of another.](https://help.apple.com/assets/63599ACE3A2E3C21301FEA6A/63599AD33A2E3C21301FEA71/en_US/b09f783052ea7b9d008d3f2bd8ed20ee.png)
Combine PDF documents
Easily combine PDF documents and transfer pages from one PDF to another.
![The Export options in Preview.](https://help.apple.com/assets/63599ACE3A2E3C21301FEA6A/63599AD33A2E3C21301FEA71/en_US/73099525caaa71efa2c837cc028af58a.png)
Convert image files to a variety of file types
Preview supports a large set of image file types, including JPEG, PNG, PSD, and TIFF. When you receive a photo that you can’t open in your photo editing app, you may be able to convert it to a file type you can use.
To explore the Preview User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field.