Crop PDF Pages

Trim PDF margins without uploading the document

Scanned pages can have dark borders, uneven white space or a strip of scanner bed around the useful content. Slide exports may have excess canvas around a diagram. A mixed PDF can contain pages whose visible areas need individual adjustment before printing or presentation.

DraftFort lets you draw the visible rectangle directly on each page. You can drag the frame, resize it from any edge or corner, enter exact percentages, and copy one proportional crop to a page range. The file is read and changed in your browser; it is not sent to DraftFort for processing.

The operation changes the PDF’s CropBox. It does not deliberately turn the page into a bitmap, recompress its images or overwrite the source file.

How to crop PDF pages

1. Add one PDF. The browser reads its page sizes and prepares a local preview.
2. Choose a page. Use the arrows or page-number field to move through the document.
3. Set the visible area. Drag inside the crop frame to move it. Drag an edge or corner to resize it. The four percentage fields provide finer control.
4. Reuse the crop where appropriate. Enter a range such as 1-3, 5 and choose Apply this crop. Each selected page receives the same proportional margins.
5. Check pages with different layouts. A crop that suits a portrait text page may not suit a landscape chart or an unusually positioned scan.
6. Download the cropped copy. DraftFort creates a separate file ending in -cropped.pdf; the original remains unchanged.

The 5% and 10% presets are quick starting points for regular borders. They are not automatic content detection. Always inspect the visible result before sharing or printing it.

Cropping is not redaction

This distinction is important: content outside the crop remains in the PDF. A PDF viewer normally hides material outside the CropBox, but another tool or a technical recipient may be able to reveal that material by changing the box again.

Do not crop a bank account number, medical detail, address, signature or other sensitive information and assume it has been removed. Use a dedicated, verified redaction process that removes the underlying text, images and related objects, then inspect the result independently.

DraftFort deliberately labels this limitation in the tool instead of creating a false sense of security.

Crop, resize, split or compress: choose the right PDF tool

These operations can look similar while solving different problems:

Cropping does not guarantee a smaller file because the hidden page content is still present. Resizing can add blank canvas or scale the page. Splitting removes complete pages from the new copy. Compression changes how page images are stored and can affect visual quality.

How proportional page-range cropping works

The four edge values are percentages of the page as displayed:

• Left and right define the horizontal margins to hide.
• Top and bottom define the vertical margins to hide.
• At least 5% of the page width and height must remain visible.

When you apply a crop to several pages, DraftFort copies those percentages rather than a fixed number of millimetres. A 5% edge therefore adapts to Letter, A4 and other page sizes. This is useful for a scanner that left a similar border on every page.

It is not always the right choice for a document with mixed orientations, off-centre originals or page-specific notes. Review those pages individually.

Rotated pages and existing PDF crop boxes

PDF coordinates begin at a different corner from most screen interfaces, and a page can also carry a 90°, 180° or 270° rotation. DraftFort translates the visual top, right, bottom and left edges into the correct PDF coordinates for each rotation.

The tool starts from the page’s current CropBox, if one already exists. That means a second crop narrows the area currently presented by the PDF instead of silently revealing content outside an earlier crop.

What remains in the cropped PDF

DraftFort changes the page view box while leaving the original MediaBox and page content in place. Ordinary text should remain searchable and selectable; vector artwork should stay sharp; images are not intentionally re-encoded. Annotations and form controls retain their original PDF coordinates.

That preservation also creates boundaries:

• a comment or form field can sit partly or fully outside the new visible area;
• bookmarks and links may still point to content that is no longer visible;
• print applications can interpret page boxes differently;
• advanced layers, scripts and accessibility structures need manual review; and
• rewriting a digitally signed file can invalidate its cryptographic signature.

If document properties such as the author, title, dates or XMP should not travel with the file, inspect the output separately with Remove PDF Metadata. That tool clears supported metadata; it still does not remove visible or hidden page content.

Keep the original file and open important output in the same PDF viewer and print workflow the recipient will use.

Why browser-only PDF cropping matters

PDFs commonly contain contracts, statements, identification, invoices, research, health information or internal business material. Cropping their margins does not require a document server. DraftFort loads the processing code only in your browser, works in temporary memory and returns the result as a local download.

The practical limit is your device. A long, image-heavy PDF can require more memory than a phone can provide. If that happens, close other heavy tabs or use a computer. The limitation is local capacity—not a hidden upload queue.