Cut away oversized white margins — automatically, hugging each page's content, or by exact millimetre values — with the whole job running on your device.
Academic papers and reports are laid out for A4 paper, where generous margins look right. On a 7-inch e-reader or a phone, those margins can eat a third of the display, shrinking the text that's left. Cropping them away makes the content fill the screen — the single most effective readability upgrade for PDFs on small devices. The same trick helps when printing slides or embedding a PDF page in another document.
Auto-trim renders each page quietly in the background, finds the bounding box of the actual ink, and crops to it with a little breathing room — each page individually, so a title page with centered text and a dense body page each get the right cut. Fixed margins instead trims the millimetre values you enter from every page's edges — predictable and uniform, the mode to use when a print shop or a submission spec gives you exact numbers. Rotated pages are handled correctly in both modes.
Honesty matters here: PDF cropping works by setting each page's display rectangle. Viewers show only the cropped area, but the trimmed content still exists in the file, and tools can restore it. That's harmless when the goal is readability, and it's why the operation is instant and lossless — nothing is re-rendered, text stays selectable, quality is untouched. But never crop to conceal sensitive information; that job needs redaction, which destroys the content. As always on this site, the entire process runs in your browser with no upload, no account, and no watermark.
No. Margin detection and the crop itself run in your browser — the file never leaves your device.
No. Cropping only changes each page's display rectangle — pages aren't re-rendered, so text stays selectable and images keep their resolution.
Potentially, yes — the trimmed area is hidden, not deleted, and tools can restore it. Crop for layout and readability; use redaction to remove sensitive content.
Auto-trim. It hugs each page's actual content, which is exactly what maximizes text size on a small screen. Use fixed margins when you've been given precise measurements.
The original file on your device is untouched — the tool always produces a copy. And because cropping is non-destructive, even the cropped copy still contains the full pages.