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
Files are processed locally in your browser — never uploaded to any server
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
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 ↑Auto mode detects content bounds per page independently, so each page is trimmed to its own content.
Try it ↑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 ↑No — detection and cropping run entirely in your browser.
Try it ↑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 ↑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 ↑Related tools
Crop PDF
Two crop modes: Auto scans each page for its content bounding box and trims the surrounding white space (keeping a small safe margin); Margins crops an exact millimetre amount from each side
Compress PDF to a Target Size
Type a target like 1MB / 500KB / 200KB and get a PDF under that size — made for visa applications, job portals and email attachment limits
PDF to Images
Render each PDF page as a JPG or PNG image and download everything as one zip