Cortar PDF
Ajuste as margens e a área visível das páginas de um documento PDF.
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Everything You Need to Know About Cropping PDFs
How PDF Cropping Works
SlimPDF's crop tool adjusts the visible area of each PDF page by modifying the page's crop box. You specify how much to trim from each edge — top, bottom, left, and right — in millimeters or as a percentage of the page dimensions. The tool recalculates the page boundaries and applies the new crop box to create a trimmed version of your document. The underlying content is preserved; only the visible area changes.
When to Crop PDF Pages
PDF cropping is useful for removing unwanted whitespace or margins from documents. Scanned pages often have uneven borders that look unprofessional. Presentation slides converted to PDF may have excessive margins. Academic papers might need margin adjustments for binding. Cropping can also remove headers, footers, or watermarks from the visible area of a page when they are positioned near the edges.
Measurement Units
SlimPDF supports two measurement units for cropping: millimeters and percentage. Millimeters provide precise control for print-oriented documents where exact dimensions matter (e.g., trimming 10mm from each side). Percentage is useful when you want consistent proportional cropping regardless of page size (e.g., trimming 5% from all edges). Switch between units depending on your specific needs.
Privacy and Local Processing
When you crop a PDF with SlimPDF, your document stays entirely on your device. The cropping process runs locally in your browser using the pdf-lib JavaScript library. This is particularly important for documents containing sensitive information that you need to crop before sharing — the file never passes through any external server or service.
Tips for Precise Cropping
Start with small values and increase gradually until you achieve the desired result. For symmetrical cropping (same amount on all sides), enter the same value for all four margins. For documents with specific trim requirements (like print bleeds), use millimeter measurements for accuracy. Remember that cropping modifies the visible area but does not permanently remove the underlying content — the data outside the crop box still exists in the file.
FAQ
How do I crop a PDF?
Upload your PDF, set the crop margins for each edge (top, bottom, left, right) in millimeters or percent, and click Crop. The tool trims all pages to the specified dimensions, and you can download the cropped PDF immediately.
Does cropping apply to all pages?
Yes. The crop margins are applied uniformly to all pages in the document. This ensures consistent page dimensions throughout the entire PDF.
Can I undo cropping?
Since SlimPDF creates a new cropped file without modifying the original, you can always go back and process the original file again with different crop settings.
Are my files secure when cropping?
Yes. All cropping happens locally in your browser using client-side JavaScript. Your PDF never leaves your device, ensuring complete privacy.
What is the difference between mm and percent cropping?
Millimeters provide absolute measurements ideal for precise print requirements. Percentage calculates the crop as a proportion of the page dimensions, useful for consistent cropping across different page sizes.