Remove White Margins from PDF (Auto-Trim)
Paper margins too wide, scans with blank borders, body text too small on your e-reader — the preset here auto-trims white margins: each page’s content edges are detected and the surrounding blank space cropped (a 6pt safety margin is kept). Cropping only adjusts the visible page area — the content itself is untouched. You can also switch to precise millimeter margins. Everything runs locally in your browser.
Drop your file here
or choose from your device — no sign-up needed
Choose filesFiles are processed locally in your browser — never uploaded to any server
Details
Full-release pricing preview: $6.9/mo or $49/yr · 30-day email notice before billing starts · nothing is charged during the beta
How it works (3 steps)
Upload a PDF
The crop mode is preset to "Auto-trim white margins"; detection starts per page after upload.
Detect content edges
Each page is analyzed to find the actual content bounds; blank borders are cropped with a 6pt safety margin. Nearly blank pages keep their original size with a notice.
Download the result
Export the trimmed PDF — body text displays larger in readers and on e-book devices.
Popular searches
- crop white space from PDF
- trim PDF margins
- PDF margins too big
FAQ
Does trimming damage the content?
No. Cropping only adjusts the page’s visible area (CropBox); the content objects stay intact, and you can re-crop or restore later with the crop tool.
Try it ↑What if margins differ from page to page?
Auto mode detects content bounds per page independently, so each page is trimmed to its own content.
Try it ↑Can I control exactly how much is cropped?
Yes — switch to the "By margins (mm)" mode and set the top/right/bottom/left widths precisely. It is the same engine as the crop tool.
Try it ↑Does a digital signature survive processing?
No. Any change to a signed PDF (merging, compressing, watermarking…) invalidates the existing digital signature — that is the tamper-proof design of PDF signatures, not a limit of this site. Process first, then sign.
Try it ↑Can I trust the processing engine?
Yes — and you can verify it: the tool runs on open-source in-browser engines (pdf-lib, pdf.js, Tesseract OCR…) on your own device. Open DevTools → Network while processing and you will see no file upload requests.
Try it ↑