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![The signature tool in Preview.](https://help.apple.com/assets/6532FAB79D2139AC34081679/6532FABB9D2139AC3408167F/en_GB/8692d781042ab9713b889e4f7cf48442.png)
Fill out and sign forms — no printer needed
You can use Preview to fill out PDF forms and even add a signature.
![A password-protected PDF.](https://help.apple.com/assets/6532FAB79D2139AC34081679/6532FABB9D2139AC3408167F/en_GB/a3379d6c9b378103dcd1fb4e192bf22e.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/6532FAB79D2139AC34081679/6532FABB9D2139AC3408167F/en_GB/8b28d10e64143ad424026a8b780ed6ca.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/6532FAB79D2139AC34081679/6532FABB9D2139AC3408167F/en_GB/a0f9211ac621b288791d83a186989263.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.