Whether you are standardizing contracts for print, fitting architectural drawings to ISO dimensions, or fixing mixed-page size documents, here is the complete guide to resizing PDF page dimensions accurately.
Page Dimension Resize vs. File Compression
Before starting, make sure you are resizing the right property! If you want to change physical paper dimensions (e.g. Letter to A4 or 4x6 label), follow this guide. If your goal is to shrink digital weight for email or web upload limits, use our Free Compress PDF Tool instead. Free Compress PDF Tool.
Method 1 (Recommended): Resize PDF Online with DocMatePDF
The fastest way to resize any PDF without installing desktop software is using the free DocMatePDF Resize Tool. It processes files directly in your browser using local WebAssembly (WASM), ensuring your private documents never leave your computer.
- DocMatePDF Resize Tool – Visit the DocMatePDF Resize Tool.
- Drag and drop your PDF into the upload workspace.
- Choose your desired target size from standard presets (e.g., A4, US Letter, A3, Legal, or 4x6) or enter custom millimetre dimensions.
- Click Resize PDF and download your perfectly scaled, print-ready document immediately.
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Method 2: How to Resize a PDF on Mac Using Apple Preview
If you are on a Mac, macOS includes a built-in virtual print engine that can rescale page dimensions without third-party downloads:
- Right-click your PDF and select Open With > Preview.
- Click File in the top menu bar and select Print (or press Cmd + P).
- Under Paper Size, select your target sheet dimensions (such as A4 or US Letter).
- Under the scaling options, select Scale to Fit and verify that Print Entire Image is checked so text isn't cut off.
- In the bottom left corner of the Print dialog, click the PDF dropdown and select Save as PDF.
Method 3: How to Resize a PDF in Windows (Microsoft Print to PDF)
Windows 10 and Windows 11 include a native virtual printer that allows you to change paper formats from any PDF viewer or web browser:
- Open your PDF in Microsoft Edge, Google Chrome, or Adobe Acrobat Reader.
- Press Ctrl + P to open the Print menu.
- Set the Printer destination to Microsoft Print to PDF.
- Open More settings and change Paper size to your required format (e.g., A4 or Letter).
- Choose Fit to printable area to prevent border clipping, then click Print to save your new file.
Common Standard Page Dimensions Quick Reference
When submitting official documents, visa applications, or college dissertations, choosing the right geographic standard is vital:
| Format Name | Millimetres (mm) | Inches (in) | Primary Region / Use Case |
|---|---|---|---|
| ISO A4 | 210 × 297 mm | 8.27 × 11.69 in | Global standard (Europe, UK, Asia, LatAm) |
| US Letter | 215.9 × 279.4 mm | 8.5 × 11.0 in | United States, Canada, Mexico |
| US Legal | 215.9 × 355.6 mm | 8.5 × 14.0 in | Contracts, government & legal filings |
| ISO A3 | 297 × 420 mm | 11.69 × 16.54 in | Posters, blueprints, spreadsheets |
| 4 × 6 Shipping Label | 101.6 × 152.4 mm | 4.0 × 6.0 in | Thermal couriers (FedEx, UPS, Amazon) |
Frequently Asked Questions
Everything you need to know about this topic.
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