What does it mean to crop a PDF?
Cropping a PDF changes the visible part of each page. It is different from cropping a photo: a PDF page has a visible box called the CropBox, and changing that box tells PDF viewers which area to display or print. The original page content can still exist outside the visible area, so cropping is best understood as adjusting what the page shows. This is useful for removing white margins, centering scanned pages, hiding unwanted edges, or making a PDF easier to read on a small screen.
How to crop a PDF online
Upload your PDF, review the first-page preview, choose Detect white margins or adjust the top, bottom, left, and right margins manually, then download the cropped result. The current workflow applies the same crop to every page, which works well for scanned books, reports, exported slide decks, forms, and documents where each page has similar margins. Your original file stays unchanged on your device.
Auto-crop white margins
Auto-crop looks for the visible content on the first page and proposes margins that remove blank white space around it. This helps with scanner borders, book pages, PowerPoint exports, lecture notes, invoices, and PDFs that place a small document inside a larger sheet. Auto-detection works best on pages with dark text or images on a light background. If the page has a full-bleed image or colored background, manual crop controls are more reliable.
When you should crop a PDF
Use a PDF cropper when a document has unnecessary margins, when a scanned receipt sits inside a full-size page, when a shipping label needs to fill the printable area, or when an academic PDF is hard to read on a phone or e-reader. Cropping can also make scanned documents look cleaner before you run OCR. It does not rewrite text or edit objects inside the page; it changes the visible area of the page.
Visual crop vs permanent crop
Most simple PDF crop tools perform a visual crop: they change the CropBox so the viewer hides the outside area. That usually does not reduce file size much, and it should not be treated as a privacy redaction method. A permanent crop removes or flattens content outside the crop area, but that requires a heavier export workflow. This first browser version focuses on fast visual cropping that preserves PDF quality without converting pages into images.
Crop one page or every page
The first version applies one crop rectangle across the full document. That is the right default for documents with consistent layout, such as scanned chapters, statements, reports, forms, and slide exports. Page-by-page crop is useful for mixed-layout documents, and it can be added later as a more advanced workflow. For now, choose a crop that works across the whole file before downloading.
Crop PDF in your browser
This crop PDF tool runs in the browser. The page loads PDF.js for preview and pdf-lib for saving the cropped PDF. There is no upload queue, no account step, and no watermark added to the output. Browser-side processing is a practical fit for private contracts, invoices, internal files, medical paperwork, school documents, and PDFs you do not want to send through a hosted conversion service.
Crop PDF before OCR
If your PDF is scanned, cropping the margins can make the file easier to read, but it will not make text selectable. After cropping a scanned PDF, use PDF OCR to recognize the text and create a searchable PDF. Keeping these steps separate makes the workflow clearer: crop adjusts the page area, while OCR recognizes letters and creates a text layer.
FAQ
How do I crop a PDF for free?
Upload the PDF, adjust the crop margins in the preview, and click Crop PDF. The tool is free, with no signup and no watermark.
Does cropping reduce PDF file size?
Usually not by much. This visual crop changes the visible page area. It does not remove all hidden content outside the crop area.
Can I crop white space from a PDF automatically?
Yes. Use Detect white margins to analyze the first page and suggest a crop. You can then fine-tune each side manually.
Can I crop a scanned PDF?
Yes. Scanned PDFs are a common use case because they often contain wide margins, scanner borders, or shadows around the page.
Can I crop a PDF without losing quality?
Yes. The crop changes the PDF page's visible area instead of rasterizing the page into a lower-quality image.
Can I crop only one page?
The current version applies the same crop to every page. Page-by-page crop can be added later for mixed-layout documents.
Are my PDFs uploaded to a server?
No. The PDF is opened and cropped in the browser tab. The result is generated locally for download.
Is cropping a PDF the same as deleting pages?
No. Cropping changes the visible area inside each page. Deleting pages removes whole pages from the document.