Crop PDF
Crop PDF pages online for free. Trim custom margins in millimeters from all edges directly in your browser with native vector preservation and zero server uploads.
Choose a PDF File
Drag & Drop a PDF here or click to quickly browse
Local Processing • Max 200MB
100% Client-Side Privacy
Crop boundaries are adjusted in your browser using WebAssembly. Your files never leave your computer or phone.
Precision Millimeter Trimming
Set exact margin trims in millimeters for top, bottom, left, and right to cleanly remove scanner shadows or hole punches.
Optimized Mobile & Kindle Reading
Eliminates wide, wasted empty margins on multi-column textbooks and research papers to maximize readability on e-readers.
Native PDF Vector Preservation
Adjusts native PDF bounding boxes (CropBox/MediaBox) without rasterizing vector drawings or compressing embedded photos.
How to Crop PDF Pages Online in 3 Steps
Trim excessive margins and unwanted scan borders from your document directly in your browser with zero server uploads.
Upload PDF File
Drop your PDF into the upload area or click to select a document from your files.
Set Crop Margins
Enter the number of millimeters you want to trim from the Top, Bottom, Left, and Right edges.
Crop & Download
Click "Crop Document" to recalculate page boundaries and download your trimmed PDF immediately.
PDF Bounding Box Standards & Specifications
How modern PDF readers interpret page boundary geometry:
| Box Type | Definition | Primary Consumer | Modified by Crop Tool? |
|---|---|---|---|
| CropBox | Defines the visible region of the page displayed in viewers and printed | PDF Viewers (Acrobat, Chrome, Preview) | Yes (actively updated) |
| MediaBox | Defines the physical boundaries of the medium onto which the page is printed | Hardware Printers & Output Devices | Preserved as fallback |
| BleedBox | Defines the region to which page content should be clipped in production prepress | Commercial Print Shops | Synchronized to CropBox |
| TrimBox / ArtBox | Defines the intended finished dimensions and artwork bounding bounds | Publishing Layout Software (InDesign) | Preserved |
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Frequently Asked Questions
Does cropping reduce the resolution or file size of my PDF?
Cropping updates the PDF internal CropBox viewport tags. It hides the designated outer margins without rasterizing or compressing embedded content, ensuring 100% crisp typography and loss-free image reproduction.
How do I convert inches or centimeters to millimeters for crop inputs?
1 centimeter equals 10 millimeters (for example, 1.5 cm is 15 mm). 1 inch equals 25.4 millimeters (for example, a half-inch margin trim is roughly 12.7 mm).
Can I crop different amounts from different edges?
Yes. Each margin input (Top, Bottom, Left, and Right) is completely independent. For example, you can remove 20mm from the top and bottom while leaving left and right set to 0.
Is it safe to crop confidential financial or medical PDFs?
Yes. Because the tool runs client-side inside your browser sandbox, your files never touch external servers or cloud databases.
Can I crop a password-protected PDF?
If your PDF is password-protected, please use our free Unlock PDF tool first to decrypt the document. Once unlocked, you can set custom crop margins and download your trimmed file.