How to Crop a PDF online - for Free
Learn how to crop a PDF online free with no signup or install, pick a safe tool, and discover why cropping only hides content—plus how to delete it for good.
To crop a PDF online at no cost, upload your file to a browser-based tool like iLovePDF, Sejda, or Smallpdf, drag a crop rectangle over the area you want to keep, choose whether to apply the crop to one page or all pages, and download the result. No signup or software install is needed. But here is the critical caveat most guides skip: cropping only hides content; it does not delete it. Anyone with a basic PDF editor can recover whatever you cropped away.
What you need before you start
A modern browser (Chrome, Firefox, Safari, or Edge), the PDF file you want to crop, and a moment to consider what is in it. If the document contains sensitive data (Social Security numbers, signatures, medical records), read the sections below on permanent deletion and safe tool selection before you start.
No account, plugin, or desktop software is required for any of the tools covered here. File-size and page-count limits vary by tool; see the comparison table further down for specifics.
If you also need to merge, split, or compress PDFs, check out our roundup of free online PDF tools — merge, split, compress, convert (no signup).
Step-by-step: how to crop a PDF online at no cost
The walkthrough below uses Sejda as the representative tool. The process is nearly identical on iLovePDF, Smallpdf, DeftPDF, and FreeConvert; tool-specific differences are noted where they matter.
Open the online PDF cropper. Go to the tool's crop page (e.g., sejda.com/crop-pdf). No account creation is required.
Upload your PDF. Drag and drop the file onto the upload area, or click "Upload PDF" to browse your device. Sejda's free tier accepts files up to 200 pages or 50 MB and allows 3 tasks per hour (Sejda). Other tools have different caps (see comparison table below).
Select the crop area. A preview of the first page appears with draggable rectangle handles. Pull the handles inward to define the region you want to keep. For precision, type exact dimensions (width × height) or margin offsets in millimetres or inches in the input fields beside the preview.
Choose which pages to crop. Use the toggle to apply your crop rectangle to the current page only, a custom page range, or all pages. Sejda and Adobe Acrobat online both support per-page cropping; simpler tools like pdfresizer apply one crop to every page.
(Optional) Auto-crop white margins. If you are trimming scanned documents with excess whitespace, look for an "Auto Crop" or "Detect Margins" button. Sejda, pdfresizer, and FreeConvert can auto-detect and remove blank borders in one click.
Apply and download. Click "Crop PDF" (or "Apply"), wait a few seconds for processing, then download the cropped file. Most tools produce a watermark-free result on the free tier.
Does cropping a PDF remove the hidden content for good?
No. Standard PDF cropping only modifies the CropBox, the metadata rectangle that tells viewers which area of the page to display. The MediaBox and the underlying content stream stay intact. Every pixel and character outside your crop boundary is still in the file and recoverable with any PDF editor, or even a single Ghostscript command.
Apple's own Preview app once displayed an explicit warning: "Cropping a PDF document doesn't delete the content outside the selection … you might be able to view it in other applications" (tinyapps.org). A technical review commissioned by the Australian Government's Defence Signals Directorate documented the same principle: visually covering or cropping data leaves the underlying text and image objects intact and extractable, while only true redaction removes them from the file structure (National Security Archive / Australian Government DSD).
The bottom line: never use a simple crop to redact sensitive information such as SSNs, financial data, or signatures. If permanent removal is your goal, read the next section.
How to permanently delete the cropped-out area
If you need the cropped-out content gone for good, take one of these extra steps after cropping:
- Flatten / Print-to-PDF. Open the cropped PDF, then use your browser's or OS's "Print > Save as PDF" dialog. This rasterises only the visible content into a brand-new file, discarding everything hidden.
- Ghostscript re-render. Run the following command, which permanently discards all content outside the CropBox (tinyapps.org):
gs -sDEVICE=pdfwrite -dUseCropBox -o output.pdf input.pdf - Adobe Acrobat Pro's "Remove Hidden Information" / Sanitize Document. This built-in feature strips hidden layers, metadata, and cropped-out content in one pass.
These are the same principles behind proper redaction workflows. Whichever method you choose, open the output file in a text editor or PDF inspector afterwards to verify the hidden content is gone.
CropBox vs. MediaBox vs. TrimBox: what "crop" means inside a PDF
The PDF specification (ISO 32000) defines five page-boundary boxes. Knowing them prevents surprises when your "cropped" file behaves differently in another application or at the printer.
A key gotcha: some print workflows ignore CropBox and use TrimBox instead. If your cropped PDF prints differently than expected, check which box your printer's RIP is reading.
How to choose a safe online PDF cropper
Client-side (browser-only) vs. server-side upload tools
Client-side tools process the PDF entirely in your browser using WebAssembly or JavaScript. The file never leaves your device. Server-side tools upload it to a remote server for processing, then (ideally) auto-delete it after a set window.
For sensitive documents (tax forms, contracts, medical records), prefer a client-side tool. If your organisation must meet HIPAA or GDPR requirements, uploading protected data to a third-party server may violate your obligations. Check the tool's privacy policy and processing model before uploading.
Free-tier limits comparison table
Limits change often. Verify on each tool's site before relying on a specific cap. Table reflects data available as of mid-2025; check each site for current figures.
How to crop a PDF on Mac at no cost (using Preview)
Preview, the built-in PDF viewer on macOS, handles basic cropping without any downloads. Open the PDF in Preview, use the rectangular selection tool to draw a box around the area you want to keep, then go to Tools > Crop (or press ⌘K). The page snaps to your selection.
Important caveat: Preview's crop is non-destructive and reversible. You can undo it with Edit > Undo Crop, or revert to any previous version via File > Revert To (Apple Support). If you need the cropped-out content permanently removed, use the flatten or Ghostscript methods described above.
How to crop a PDF on iPhone or Android
On iOS, use the built-in Files app's Markup feature or a free app like iLovePDF Mobile or Xodo. Open the PDF, tap the markup/annotation icon, select the area, and crop.
On Android, open the file in Xodo, the iLovePDF app, or use Sejda's mobile web interface in your browser. Google Drive does not offer a built-in PDF crop. The same drag-to-crop workflow applies in any of these tools.
The same non-destructive caveat applies on mobile: cropping modifies the CropBox, not the content stream.
Power-user path: cropping PDFs from the command line
For developers, students, and anyone batch-processing hundreds of files, command-line tools are free, offline, and scriptable.
- pdfcrop (Perl script, part of TeX Live): auto-trims whitespace around page content. Requires Ghostscript ≥ 8.0 for rotated pages (CTAN).
pdfcrop input.pdf output.pdf - Ghostscript: crop to specific dimensions or honour the existing CropBox.
gs -sDEVICE=pdfwrite -dUseCropBox -o cropped.pdf input.pdf - qpdf: manipulate page boxes programmatically and pipe into other tools.
qpdf --pages input.pdf 1-5 -- input.pdf output.pdf
All three are open-source, cross-platform, and handle thousands of pages without browser-tab memory limits.
Troubleshooting and common mistakes
- "My file size didn't change after cropping." Expected. Cropping changes the CropBox metadata, not the content stream. Flatten or re-render to reduce size, or use a free PDF compressor.
- "The cropped area reappeared when I opened the file in another app." That app may be reading the MediaBox instead of the CropBox. Use the permanent-deletion steps above to strip the hidden content.
- "The tool added a watermark." You likely exceeded the free-tier task or page limit. Switch to another tool from the comparison table, or try pdfresizer/DeftPDF.
- "I can't crop individual pages differently." Not all tools support per-page cropping. Sejda and Adobe Acrobat online do; simpler tools apply one rectangle to every page.
- "Auto-crop cut off my content." Auto-detect can misjudge margins on scanned PDFs with dark edges or faint text. Switch to manual crop and set your own boundaries.
FAQ
Can I crop a PDF without Adobe Acrobat?
Yes. Free browser tools (iLovePDF, Sejda, DeftPDF), Apple Preview on Mac, and command-line utilities like pdfcrop and Ghostscript all crop PDFs without any Adobe product.
Will cropping reduce my PDF's file size?
Usually not. Cropping modifies CropBox metadata but leaves the original content stream intact. To shrink the file, flatten/re-render or compress it separately.
Is there a completely free PDF cropper with no watermark and no page limit?
Fully unlimited free online tools are rare. pdfresizer and DeftPDF have generous free tiers. For unlimited offline cropping, use Preview on Mac or pdfcrop from the command line.
What is the difference between cropping and trimming a PDF?
Cropping sets the visible CropBox (what viewers display). Trimming sets the TrimBox, which defines the finished page size for commercial print finishing. Both are non-destructive page-box changes defined in ISO 32000.
How do I crop a PDF to a specific size like A4 or Letter?
Use a tool that accepts custom dimensions, such as Sejda or iLovePDF, and enter the target size (e.g., 210 × 297 mm for A4, 8.5 × 11 in for Letter). You can also use Ghostscript with the -dDEVICEWIDTHPOINTS=612 -dDEVICEHEIGHTPOINTS=792 flags for Letter.
