![](https://help.apple.com/assets/5FDCF672DE9F1523485DF641/5FDCF673DE9F1523485DF648/en_GB/67b42e1eeb7bbfca6279218dff8b9ba1.png)
![The signature tool in Preview.](https://help.apple.com/assets/5FDCF672DE9F1523485DF641/5FDCF673DE9F1523485DF648/en_GB/fa1085a35f4c620b15982a5fc8f8ec99.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/5FDCF672DE9F1523485DF641/5FDCF673DE9F1523485DF648/en_GB/4c2924c440b7e0ae49eec633a5c6d4a3.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/5FDCF672DE9F1523485DF641/5FDCF673DE9F1523485DF648/en_GB/b0f186508687694815ef7d8a8a422acd.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/5FDCF672DE9F1523485DF641/5FDCF673DE9F1523485DF648/en_GB/8fe5909be41bee245b00135d3851e927.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.