Crop PDF Margins
Trim unwanted white margins off every page of a PDF by setting top, right, bottom, and left amounts in inches, centimetres, millimetres, or points — all in your browser.
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Quick answer
To crop a PDF, upload it and enter how much to trim from the top, right, bottom, and left of every page (in inches, cm, mm, or points). The tool sets a new crop box on each page, hiding the margins outside it, and downloads the result. It runs entirely in your browser with pdf-lib, so the file is never uploaded. Cropping changes the visible area without deleting the underlying content.
Formula & method
Your margin amounts are converted to PDF points (1 inch = 72 points) and subtracted from each page's box, producing a smaller crop box anchored at the page's lower-left plus the left/bottom margins. PDF viewers display and print only the crop-box region, so the margins disappear from view. The content itself remains in the file, so the crop is non-destructive and reversible.
Examples
- Input
- 0.5 in on every side
- Result
- Tighter margins
- Why
- Removes a uniform border from each page.
- Input
- Top 1 in, others 0
- Result
- Header trimmed
- Why
- Use a single-side margin to cut a header or footer band.
- Input
- Unit mm, 10 mm sides
- Result
- 10 mm trimmed
- Why
- Switch units for metric documents.
When to use this tool
- Removing wide white margins to fit more content on screen or when printing.
- Trimming a repeated header or footer band from scanned pages.
- Standardizing margins across a document before sharing.
Common mistakes
- Entering margins larger than the page, which would leave nothing visible — the tool blocks this.
- Expecting the hidden content to be deleted; cropping only changes the visible crop box.
- Mixing up units — confirm whether you mean inches, cm, mm, or points before cropping.
Frequently asked questions
How do I crop a PDF?
Upload it, pick a unit, enter the top, right, bottom, and left amounts to trim, and click Crop. The cropped PDF downloads.
Does cropping delete the hidden content?
No. It sets a new crop box, so viewers show only the trimmed area, but the original content stays in the file and the crop can be undone.
What units can I use?
Inches, centimetres, millimetres, or points. The tool converts everything to PDF points internally (1 inch = 72 points).
Is my PDF uploaded?
No. Cropping happens locally in your browser with pdf-lib.
Does it crop every page the same way?
Yes. The same margins are applied to every page. Pages of different sizes are each trimmed by the amounts you set.
Why can some viewers still show the full page?
A few tools ignore the crop box. Most standard viewers and printers respect it and show only the cropped area.
Sources & references
External references open in a new tab. We are independent and not affiliated with these organizations.
- ✓ Free to use
- ✓ No sign-up required
- ✓ Runs entirely in your browser — nothing is uploaded.
- ✓ Formula and method shown above
Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.
Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.
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