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Preview User Guide
for macOS Catalina
![The signature tool in Preview.](https://help.apple.com/assets/5E31B4CA680CE2D1513448C6/5E31B4DD680CE2D1513448CE/en_US/f7a893ea2a5e648d912279420728ffd5.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_US/a8764d997e66caa5ebee200bd7fc09e6.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_US/2aef19e1163d545693eff80d4ddc4843.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_US/f3e3b52f72a81eb84a7c7ed29831c56d.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.