Crop PDF Margins
Automatically detect and remove white margins from every page — bigger text on Kindle, reMarkable and tablets. Lossless, free, and files never leave your browser.
Drop your PDF here
or click to choose a file — no size limit, no signup
🔒 Files never leave your browser — all processing happens locally.
How it works
- Drop your PDF into the box above.
- Every page is scanned to find the content area, and uniform margins are cropped from all pages.
- Download the cropped PDF — the change is lossless and reversible.
Frequently asked questions
Does cropping reduce quality?
No. The tool only changes the page CropBox — the displayed area — and never re-encodes your content. It is lossless and reversible.
How does automatic margin detection work?
Each page is rendered in your browser, the content bounding box is measured pixel by pixel, and the smallest margins across all pages are removed so every page gets the same crop.
Why crop margins for an e-reader?
Papers and ebooks often have wide margins. Removing them makes the text substantially larger on Kindle, reMarkable, Onyx Boox and tablets without zooming on every page.
Is my PDF uploaded anywhere?
No. Rendering and cropping all happen locally in your browser — nothing is sent to any server.