--- title: "Crop PDF Online - Trim Page Margins Privately | CanDoYa" description: "Crop PDF pages online by trimming exact margins in millimetres. Preview the result, choose page ranges, and download privately with no upload." url: https://candoya.com/tools/crop-pdf/ locale: en type: browser-tool --- # Crop PDF Online Category: PDF ## How can I crop PDF pages online? A PDF cropper changes the visible boundary of each page so wide margins, scanner borders, or unwanted edge content no longer appear. Add a PDF, enter the top, right, bottom, and left margins in millimetres, choose the pages, preview the kept area, and download the result without uploading your file. **Crop one page range or the whole document.** The tool reads each page's existing CropBox and applies your margins relative to the edges you see, including rotated pages. It preserves the document's text, vectors, links, and image quality because it changes page geometry instead of rasterizing the PDF. Processing happens locally in your browser. Files up to 100 MB and 1,000 pages are supported, subject to the memory available on your device. ## How to use it 1. **Add your PDF** - Choose a local PDF or drop it into the workspace. The browser reads its page count and geometry. 2. **Set the crop margins** - Enter how many millimetres to trim from the top, right, bottom, and left visible edges. Check the shaded preview. 3. **Choose the pages** - Apply the same crop to every page or enter individual pages and ranges such as 1, 3-5. 4. **Download the cropped file** - Crop the PDF, review the summary, and save the new file to your device. ## Who it's for - **Students and e-reader owners** can remove wide textbook margins so content appears larger on a tablet. - **Office teams** can trim scanner shadows or empty borders before sharing a report. - **Print designers** can set a tighter visible page boundary for proofs without lowering source quality. - **Researchers** can crop selected pages in a mixed document while leaving the rest unchanged. ## Expert note Cropping a PDF normally changes its CropBox, which controls what viewers and printers display. It does not securely erase objects outside that box, so confidential material should be redacted rather than merely cropped. ## Frequently asked questions ### Is my PDF uploaded while I crop it? No. The PDF is opened, previewed, and cropped locally by code running in your browser. The file is not sent to CanDoYa for processing. Your browser only creates a new downloadable PDF on your device. ### Is this PDF cropper free? Yes. You can crop PDF pages without creating an account, adding a watermark, or paying for a download. The practical limits are 100 MB and 1,000 pages per file, plus the memory available to your browser. ### Does cropping permanently delete hidden PDF content? No. Standard PDF cropping sets the visible CropBox and usually leaves content outside that boundary in the document. Do not use cropping to conceal private text or images. Use a proper PDF redaction workflow when information must be removed. ### Can I crop only certain PDF pages? Yes. Choose Selected pages and enter page numbers or ascending ranges separated by commas, such as 1, 3-5, 8. The chosen pages receive the margins while every other page keeps its current crop boundary. ### Will cropping reduce PDF quality? No raster conversion is used, so text, vector artwork, images, links, and existing page content retain their original quality. The output changes only the visible page boundary for the pages you select. ### How are rotated PDF pages cropped? The margin labels always match the top, right, bottom, and left edges shown by a PDF viewer. The tool maps those visible edges back to the page's stored coordinates, so a 90-degree rotated page crops in the direction you expect. ### Can I crop pages with different sizes? Yes, but one margin set is applied to every selected page. The tool checks each selected page before processing and stops if the margins would leave any page too narrow or too short. Preview representative pages in mixed-size documents first. ## Related tools - [PDF Page Size Checker](https://candoya.com/tools/pdf-page-size-detector/) - [Rotate PDF](https://candoya.com/tools/rotate-pdf/) - [Reorder PDF Pages](https://candoya.com/tools/reorder-pdf-pages/) - [Split PDF](https://candoya.com/tools/split-pdf/) - [Delete PDF Pages](https://candoya.com/tools/delete-pdf-pages/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*