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Preview User Guide
for macOS Mojave
![The signature tool in Preview.](https://help.apple.com/assets/5B8089700946229B75623758/5B8089720946229B7562375F/en_GB/c0d12b1820bd9d83e228339cabf7ba11.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/5B8089700946229B75623758/5B8089720946229B7562375F/en_GB/d57751a61816174c4080a43327b661f2.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/5B8089700946229B75623758/5B8089720946229B7562375F/en_GB/998cf4a85c6ab09924d27b3d813f160f.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/5B8089700946229B75623758/5B8089720946229B7562375F/en_GB/42cf89fe8c0de41a04d44a7f8ff92a49.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.