PDF Basics
How to Crop PDF Pages and Trim Margins
April 2026 · 5 min read
What cropping actually does to a PDF
Cropping a PDF page changes the visible region displayed by viewers - it does not delete the content outside the crop area. PDF uses a CropBox to define what region is shown. Content outside the CropBox still exists in the file; it is simply hidden from view.
This is an important distinction. If you crop a scanned page to remove a border and share the file, a recipient with a tool that ignores the CropBox might see the full original page. For most viewers and use cases, the crop works as expected, but it is not the same as permanently removing content.
To permanently remove content outside the crop area, you need to flatten or re-render the page. Some tools handle this automatically. PDFsuite applies a CropBox crop, which works correctly in all standard viewers.
Common reasons to crop
Scanned documents often have uneven margins - the scanner captures more of the page background than the actual document. Cropping trims these borders so the content fills the visible area cleanly. This is particularly noticeable with old documents scanned on a flatbed where the dark background around the page is visible.
Print-ready PDFs from design software sometimes include bleed area and crop marks that are not meant to be visible in the final distributed file. Cropping removes these before sharing with clients or publishing online.
Technical drawings and diagrams often have large margins of whitespace that make the actual content appear small in a viewer. Cropping to the content area makes the drawing more readable without changing its content.
How to crop with PDFsuite
Open /tools/crop and upload your PDF. The tool displays the first page with a draggable crop rectangle overlaid on it. Drag the handles to define the area you want to keep. The region outside the rectangle will be hidden in the output.
Apply the same crop to all pages with the apply-to-all option, or adjust each page individually if they have different content areas. Individual adjustment is useful for scanned documents where the content position varies slightly page to page.
Click Crop. The tool writes the new CropBox values and downloads the file. Open the result to confirm the crop looks correct. If you over-cropped, upload again and adjust - there is no quality loss from re-cropping because the underlying content is unchanged.
Cropping to remove headers and footers
Headers and footers in generated PDFs (page numbers, document titles, timestamps) can be removed visually by cropping the top or bottom margin. This is a quick approach when you cannot regenerate the PDF without those elements.
Set the crop rectangle to exclude the header or footer region. For consistent results across all pages, measure the pixel height of the header or footer area in the first page and apply the same crop to all. PDFsuite allows numeric input for precise crop dimensions.
Note that this hides the headers and footers rather than deleting them. If the recipient uses a tool that ignores the CropBox, the headers reappear. For a permanent solution, use a tool that re-renders the page content without the cropped regions.
Page size and crop
Cropping does not change the nominal page size of the PDF - it changes the visible area within that page. The PDF still reports its original MediaBox dimensions (the full page size). Some applications that read PDF dimensions may report the pre-crop size.
If you need the page size itself to change - for example, to convert an A4 page with large margins into a smaller document that fits its content - you may need to use the change-page-size tool after cropping, or flatten the crop and then resize.
For print workflows, check whether your printer or print shop reads the MediaBox or CropBox for page dimensions. Most modern print RIPs respect the CropBox. If you are unsure, ask your print provider before sending a cropped file for production.
Try it yourself
Process your PDFs in the browser.
All 28 tools. Files never leave your device. $29/year.