Cropping PDF pages helps you create consistency within a PDF if the file is composed of pages with different sizes.
1. Open the PDF.
2. Click “Edit” on the top menu and choose the “Crop" option.
3. Drag a rectangle on the page you want to crop. Select either you want to "Crop All Pages" or "Crop Current Page".
4.Then click "Crop" to apply the changes. Or you can undo the cropping by clicking "Undo" under the "Edit" menu on top of the screen.