![](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/67b42e1eeb7bbfca6279218dff8b9ba1.png)
![The signature tool in Preview.](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/6f464a224223513a4731e6893e513cff.png)
Fill out and sign forms—no printer needed
You can use Preview to fill out PDF forms and even add a signature. With enhanced AutoFill, you can fill in your information with a click.
![The “Optimize images for screen” option in Preview.](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/95f43edac558c1e5d21ac708d2bda38a.png)
Compress documents
You can reduce the size of a large PDF to save storage space.
![A password-protected PDF.](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/ae5a05c91254fef2789d00f1187ad6b6.png)
Protect your confidential documents
If a PDF contains sensitive information, you can keep it secure by adding a password.
![The Export options in Preview.](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/8de4748dbf77b72e6643c7b65785a450.png)
Convert image files to a variety of file types
Preview supports many types of image files. 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.
![A page thumbnail is dragged from the sidebar of one PDF to the sidebar of another.](https://help.apple.com/assets/66E20C11AAB692A44803F303/66E20C12A39D218AA90A13A6/en_US/b09f783052ea7b9d008d3f2bd8ed20ee.png)
Combine PDF documents
Easily combine PDF documents and transfer pages from one PDF to another.
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.