![](https://help.apple.com/assets/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_GB/54a8a920f0daf429e77e6077f976dd85.png)
![The signature tool in Preview.](https://help.apple.com/assets/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_GB/e98ab2d0a206d93fd3373e7041621800.png)
Fill out and sign forms right on your Mac
You don’t need to print out 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/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_GB/f18e105edb6f19672305f2a93037dcf1.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/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_GB/20312dc20bb22b7848a4df15e0a275a2.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/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_GB/4a03d57c2d476fffb09d1681e7209471.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 browse the Preview User Guide, click Table of Contents at the top of the page.