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6 min read · Updated February 2025Standard PDF Page Sizes: ISO A4 vs US Letter vs ISO A3 Dimensions
Understanding the differences between international ISO 216 paper sizes (A4, A3) and North American standards (US Letter, Legal) is critical for ensuring clean document printing without unwanted scaling or clipped margins.
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Standard Paper Dimension Comparison Table
| Paper Format | Millimetres (mm) | Inches (in) | PDF Points (72 DPI) | Primary Geography |
|---|---|---|---|---|
| ISO A4 | 210 × 297 mm | 8.27 × 11.69 in | 595.28 × 841.89 pt | Global / International |
| US Letter | 215.9 × 279.4 mm | 8.5 × 11.0 in | 612 × 792 pt | United States, Canada |
| ISO A3 | 297 × 420 mm | 11.69 × 16.54 in | 841.89 × 1190.55 pt | Global (Posters, Schematics) |
| US Legal | 215.9 × 355.6 mm | 8.5 × 14.0 in | 612 × 1008 pt | North America (Court briefs) |
Why A4 vs US Letter Mismatches Cause Printing Errors
ISO A4 is slightly narrower and taller than US Letter (A4 is 210mm wide vs Letter 215.9mm; A4 is 297mm tall vs Letter 279.4mm). If an A4 document is printed on US Letter paper without scaling, the top or bottom 17.6mm of content gets clipped.
Using our PDF to A4 or PDF to US Letter tool scales the PDF media box proportionally, centering the content cleanly.
How to Convert PDF Page Dimensions Privately
- Step 1: Choose Your Resizing Tool
Select PDF to A4, PDF to A3, or PDF to Letter. - Step 2: Drop Your Document
The file is parsed in local RAM. - Step 3: Click Resize & Save
The engine adjusts the MediaBox and CropBox bounding rectangles and delivers your updated PDF instantly.