Why Crop a PDF
Documents often carry margins you don't want: a scanner that left wide white borders, a slide deck with empty space around each slide, a contract with a header and footer you'd rather drop, or a page that's hard to read on a phone because the real content sits in the middle. Cropping trims those edges so the page shows only what matters — tighter for reading on a small screen, cleaner for printing, and neater when placed into another document.
How Cropping Works — Non-Destructive and Lossless
Every PDF page has two boxes: the media box (its full physical size) and the crop box (the visible region). This tool adjusts the crop box on each page by the percentages you enter for the top, right, bottom and left edges, then saves a new file. Viewers and printers display and print only the cropped region. Because nothing is re-rendered, text stays selectable and graphics stay vector-sharp.
The trimmed content isn't destroyed — it remains in the file outside the crop box, so the crop can be widened again later if needed. Everything happens in your browser; the document is never uploaded.
Tips for Clean Margins
Start with small values (5–10%) and adjust — it's easy to over-trim. You can cut a different amount from each side, which is handy for removing a header from the top or a binding margin from one edge only. To trim the same amount all around, enter the same number in all four boxes.