The crop tool allows you to adjust the page size. It is useful for trimming white margins and giving the document a coherent look by making it the same size. You can also crop PDFs in different dimensions if your content requires it.By cropping and rotating your document vertically, you will give it a more formal and businesslike look. Horizontal cropping results in the presentation style from Microsoft PowerPoint. Consider the style, purpose, and appearance of your doc in advance.