Choosing the right page size for your PDF is crucial for professional results. Different regions and use cases require different standards. This guide will help you select the perfect page size for your images.
| Size Name | Dimensions | Aspect Ratio | Primary Region | Best For |
|---|---|---|---|---|
| A4 | 210 × 297 mm | 1:√2 | Worldwide (except US) | Letters, documents, forms |
| Letter | 8.5 × 11 in | 1:1.294 | US, Canada, Mexico | Business documents, forms |
| Legal | 8.5 × 14 in | 1:1.647 | US, Canada | Legal contracts, forms |
| A3 | 297 × 420 mm | 1:√2 | Worldwide | Posters, diagrams, presentations |
| A5 | 148 × 210 mm | 1:√2 | Worldwide | Booklets, flyers, notepads |
Portrait vs Landscape
Portrait
Taller than wide (Vertical)
- ✓ Best for: Letters, documents, forms
- ✓ Standard for most business documents
- ✓ Ideal for portrait-oriented photos
- ✓ Better for reading on mobile devices
Landscape
Wider than tall (Horizontal)
- ✓ Best for: Presentations, wide images
- ✓ Ideal for panoramas and group photos
- ✓ Better for widescreen displays
- ✓ Perfect for before/after comparisons
How to Choose the Right Page Size
📸 For Photos and Images
Match page size to your image orientation. If your images are mostly portrait, use portrait orientation. For landscape photos, use landscape. If you have a mix, choose based on the majority or use "Contain" fit mode.
📄 For Scanned Documents
Use the original paper size. US documents -> Letter or Legal. International documents -> A4. This ensures the PDF matches the original paper size perfectly.
🎨 For Portfolios and Presentations
A4 or Letter with landscape orientation works best. This gives you a clean, professional look that displays well on screens and prints easily.
International vs US Standards: What You Need to Know
🌍 ISO Standard (A4, A3, A5)
Used in 95% of countries worldwide
- • Standard for all international business
- • Used in Europe, Asia, Australia, Africa
- • Scaled sizes (A0 to A10)
- • Aspect ratio: 1:√2 (very consistent)
🇺🇸 US Standard (Letter, Legal)
Used primarily in USA, Canada, Mexico
- • Letter: 8.5 x 11 inches (common)
- • Legal: 8.5 x 14 inches (legal docs)
- • Not part of ISO standard
- • Different aspect ratio
💡 Pro Tip
💡 Quick Tip: A4 vs Letter
A4 is slightly taller and narrower than Letter. For international audiences, choose A4. For US/Canada audiences, choose Letter. When in doubt, A4 is the safer choice for global distribution.
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