Crop & Resize PDF - Trim Margins, Set A4 or Letter Size Free

A PDF crop and resize tool adjusts how each page is framed inside the document without re-scanning paper or re-exporting from Word. Cropping trims excess margin space - the wide white borders phone cameras and flatbed scanners often leave around receipts, contracts, and textbook pages. Resizing scales an entire page (and its embedded content) to a standard paper dimension such as A4, US Letter, or US Legal so mixed-size archives print consistently. This page uses pdf-lib loaded on demand in your browser. Crop mode rewrites the page MediaBox and CropBox coordinates; resize mode calls setSize to scale content into the target frame. Neither path rasterizes text the way a screenshot workflow would, so selectable text and vector lines stay intact where the source PDF already had them.

Cropping is not the same as compressing, rotating, or deleting pages. Compression re-encodes images to shrink bytes; rotation changes viewing angle; deletion removes entire pages from the file sequence. Crop only clips the visible frame inward. If your problem is sideways scans, use the PDF rotate tool. If page order is wrong, use PDF sort. Many real workflows combine crop first (remove borders), then rotate (fix orientation), then compress (fit email limits).

PDF page boxes are defined in the ISO 32000 specification. The MediaBox is the physical page boundary; the CropBox is what viewers clip to by default. Professional prepress workflows also reference BleedBox and TrimBox for commercial printing. This browser tool adjusts MediaBox and CropBox together so everyday viewers - Adobe Acrobat, Chrome, Preview, mobile readers - clip consistently. It does not attempt print-shop bleed management; if your job requires precise trim and bleed for a commercial printer, validate output in their preflight software. Page count validation uses PDF.js; box math and scaling use pdf-lib loaded on demand - the same stack as other DevOkk PDF tools.

Most documents take under two minutes from upload to download. Nothing leaves your browser.

1. Upload your PDF - Drag and drop a PDF or click Choose PDF File. validatePdfUpload checks the MIME type and the 50 MB limit before pdf-lib loads.
2. Choose crop or resize - Crop trims margins in millimeters or points on each side. Resize scales selected pages to A4, US Letter, or US Legal.
3. Set values and page scope - Enter top, right, bottom, left margins, or pick a target paper size. Select all pages or a range like 1, 3-5.
4. Apply and download - Click Apply Crop or Apply Resize, then Download Processed PDF. Your original file on disk stays unchanged.

Imagine an expense report scanned on an office flatbed: eight portrait pages, each with roughly 12 mm of white border on every edge because the paper was smaller than the glass. Printing as-is wastes toner; emailing looks unprofessional. Crop fixes the frame without touching the scan quality inside the content area.

Steps on this page: upload the batch, confirm eight pages in the info panel, leave Operation on Crop margins, set unit to mm, enter 12 on all four sides, choose All pages, click Apply Crop, then Download. File size stays nearly identical because pdf-lib only changed box numbers - no JPEG pass occurred. If only the cover sheet had extra border, switch Pages to process to Page range and enter 1 instead.

Pick the operation that matches the problem. These tools complement each other.

Crop when margins are the problem; resize when page dimensions must match A4 or Letter; compress when file bytes must shrink for email. Many scan workflows run crop → rotate on PDF rotate → compress on PDF compressor in that order. Resize before merge when combining US and EU exports so every chapter prints on the same paper size.

These are the failures the UI surfaces on purpose, plus jobs this page will not pretend to do.

• Invalid upload. Non-PDF files and files over 50 MB are rejected before processing starts.
• Margins too large. If top + bottom (or left + right) exceed the page dimensions, pdf-lib cannot create a valid box and the tool reports the error.
• Encrypted PDFs. Password-locked files must be decrypted locally first.
• Box-only crop. Crop adjusts MediaBox and CropBox coordinates. Content drawn outside those boxes may still exist in the file stream but will not display in most viewers. This is not the same as visually selecting a rectangle in Acrobat Pro.
• No bleed/trim prepress. Commercial print shops use BleedBox and TrimBox for cutting guides. This tool does not set those boxes - validate with your printer before paying for a press run.
• Resize scales content. setSize proportionally scales page contents. Extremely wide tables may become small text - re-export from the source app when layout reflow is needed instead of scaling.
• Per-page mixed sizes preserved on unselected pages. Page range only affects listed indexes; others keep original boxes.
• Memory on huge files. Files near 50 MB may spike RAM during save. Close other tabs if the browser warns about memory.
• No undo stack. Keep the original file or re-upload if settings were wrong.

PDF crop and resize on this page runs entirely in your browser. pdf-lib and PDF.js load from the same origin; your document bytes are never POSTed to an API, never written to server logs, and never indexed. That makes the tool suitable for contracts, medical records, and financial statements - subject to your own device security policies.

We do not persist uploads in localStorage. Closing the tab discards in-memory state except any file you explicitly downloaded. No account means no cross-device history.