How is this different from other online PDF tools?

Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.

Are my PDF files uploaded?

No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.

Can I verify that files are not uploaded?

Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.

Does this tool work offline?

Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.

What happens when I refresh the page?

Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.

Does this tool store my files?

No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.

Can this tool unlock password-protected PDFs?

No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.

What technologies does this tool use?

This tool uses client-side JavaScript and pdf-lib to adjust each page's CropBox entirely within your browser — your files never leave your browser.

Does this tool use WebAssembly?

No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.

How do I crop the margins off my PDF?

Pick a PDF with the file picker, then type how many millimetres to trim from the top, right, bottom, and left in the four boxes. Press the crop button and save the result — everything runs locally in your browser, and the same margins are applied to every page.

Why is the cropped-away content still visible in some PDF viewers?

Cropping here shrinks each page's CropBox inward rather than deleting anything, so the content outside the box is hidden, not removed. Most viewers and printers respect the smaller box, but some can reveal the hidden area, so do not rely on this to permanently erase content.

Can I crop each page differently, and what happens if my margins are too large?

The four margin values are applied uniformly to every page, so per-page cropping is not currently available. If the margins you enter would leave a page with no visible area, the tool stops and tells you which page number is affected so you can lower the values.

Does the Crop PDF tool cost anything to use?

Cropping PDF margins is completely free — no account, no sign-up, and no cap on how many files or pages you trim, and it always will be. Your PDF is read directly by your browser and the CropBox is adjusted right there in your tab using pdf-lib, so the file never leaves your device and is never sent to any server.

Crop PDF Margins Privately — Trim White Space Without Leaving Your Browser

Select a PDF, enter the margins (in mm) to remove from each side, and download a cropped PDF — the same crop is applied to every page, all locally in your browser.

Quick answer

What it does: Select a PDF, enter the margins (in mm) to remove from each side, and download a cropped PDF — the same crop is applied to every page, all locally in your browser.
Free?: Yes — 100% free, no account or sign-up.
Files uploaded?: No — everything is processed in your browser.
Works offline?: Yes — once the page has loaded.
Best for: A researcher removes wide scanner borders from a digitised journal article to make it easier to read on a tablet.
Good to know: The same crop is applied to every page; per-page cropping is not currently supported.

How it works

Select a PDF file from your device using the file picker.
The file is read into browser memory — no data leaves your browser.
Enter the margin to remove from each side (top, right, bottom, left) in millimetres.
pdf-lib shrinks each page's visible CropBox inward by those margins, keeping the underlying content intact.
The cropped PDF is offered as a download directly from your browser.

When to use this tool

A researcher removes wide scanner borders from a digitised journal article to make it easier to read on a tablet.
A designer trims excess white space around a poster PDF before embedding it in a presentation.
A teacher crops a textbook page to hide margin answers before sharing it as a student worksheet.
Cropping adjusts the visible CropBox but does not permanently delete content outside it — some PDF viewers can still reveal the hidden area.

Frequently asked questions

How is this different from other online PDF tools?: Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.
Are my PDF files uploaded?: No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.
Can I verify that files are not uploaded?: Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.
Does this tool work offline?: Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.
What happens when I refresh the page?: Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.
Does this tool store my files?: No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.
Can this tool unlock password-protected PDFs?: No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.
What technologies does this tool use?: This tool uses client-side JavaScript and pdf-lib to adjust each page's CropBox entirely within your browser — your files never leave your browser.
Does this tool use WebAssembly?: No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.
How do I crop the margins off my PDF?: Pick a PDF with the file picker, then type how many millimetres to trim from the top, right, bottom, and left in the four boxes. Press the crop button and save the result — everything runs locally in your browser, and the same margins are applied to every page.
Why is the cropped-away content still visible in some PDF viewers?: Cropping here shrinks each page's CropBox inward rather than deleting anything, so the content outside the box is hidden, not removed. Most viewers and printers respect the smaller box, but some can reveal the hidden area, so do not rely on this to permanently erase content.
Can I crop each page differently, and what happens if my margins are too large?: The four margin values are applied uniformly to every page, so per-page cropping is not currently available. If the margins you enter would leave a page with no visible area, the tool stops and tells you which page number is affected so you can lower the values.
Does the Crop PDF tool cost anything to use?: Cropping PDF margins is completely free — no account, no sign-up, and no cap on how many files or pages you trim, and it always will be. Your PDF is read directly by your browser and the CropBox is adjusted right there in your tab using pdf-lib, so the file never leaves your device and is never sent to any server.