PDF Trim is a utility for intuitively trimming the edges of PDF pages. It also provides tools for cutting out a mid-section of a page, or deleting an entire page. PDF Trim is especially useful for quickly editing PDF pages saved from web articles.
When PDF Trim launches, it displays the "PDF Trim Tutorial" PDF, ready for you to edit. You can practice using the trimming tools on this PDF. At any point, you can reset the PDF to the original version, using the Help menu > "Show PDF Trim Tutorial PDF" command.
Updated August 2019. Requires macOS 10.12+