Automatically trim white margins from every page for a tighter, mobile-friendly PDF.
Auto-crop detects the content on each page and trims the surrounding white margins — no manual box-drawing needed. Great for maximising screen space when reading on phones and tablets. Files are processed securely and never stored.
Upload your file using the tool above.
Adjust any settings to your preference.
Click the process button and wait for results.
Download your output using the download button.
Mostly for reading on small screens. Academic papers and books carry generous print margins that waste a third of a phone or e-reader display, forcing you to zoom on every page. Trimming the white space makes the text fill the screen at a comfortable size.
Cropping hides the margin area rather than deleting text — the content is still in the file, just outside the visible page box. Watch out for anything living in the margins, though: page numbers, footnotes, marginal annotations and headers can disappear from view if the crop is aggressive.
Not from the cropped file here, so keep your original. Because cropping adjusts the visible page box rather than removing data, some PDF editors can restore the full page — but that is not guaranteed across tools, and relying on it is riskier than simply keeping a copy.
Yes, Crop PDF (Trim Margins) is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
Crop PDF (Trim Margins) uploads your file over an encrypted connection to our own processing server, converts it, and returns the result. The file is deleted immediately after processing and is never used for anything else. It is not sent to any third party, and we keep no copies.
Drop a PDF to auto-crop
Automatically trim white margins from every page
Drop your file into the stage to begin.
What it does: Automatically detects the printed content on each page and removes the empty white border around it — great for maximising screen space on mobile.
Privacy: Your PDF is sent over an encrypted connection, cropped in memory, and deleted immediately after — never stored.