In Newzik, you can crop any PDF page to adjust its margins, optimize its size and straighten it. To do so, open the Features Menu and choose “Crop”.

Shortcut: tap anywhere on the screen with 3 fingers to open the Crop view.

To crop a page, use two fingers to zoom in and out in a pinching motion.

To rotate a page, slide the cursor at the top of the screen.

To apply saves changes on the current page, tap on "Done" or navigate to another page (using the arrows on either side of the screen or the thumbnails at the bottom).

If you want to apply your settings to all pages, click on the three dots button and select "Apply to all pages" (you can also choose to apply them to even or odd pages only).

You can also choose "Reset all" to revert back to the original crop and rotation settings.

Note: 

To change the orientation of a page (to portrait or landscape), you can do so in the "Reorder" menu.