Image resolution determines how sharp and clear your images will appear in PDF format. Understanding DPI (dots per inch) and PPI (pixels per inch) is essential for creating professional PDF documents that look great on screens and in print.
📘 Info
📐 What is DPI vs PPI?
DPI (Dots Per Inch): Used for print - measures printer dots.
PPI (Pixels Per Inch): Used for digital images - measures screen pixels.
For PDF conversion, we focus on PPI of your source images.
Complete DPI Guide for Every Use Case
| Usage | Recommended DPI | Pixel Dimensions (for 8x10") | File Size Estimate |
|---|---|---|---|
| Web / Social Media | 72-96 DPI | 720-960 px | 100-500 KB |
| Email Attachments | 96-150 DPI | 960-1500 px | 200 KB - 1 MB |
| Presentations | 150 DPI | 1500 px | 500 KB - 2 MB |
| High Quality Print | 300 DPI | 3000 px | 2-10 MB |
| Professional Print | 300-600 DPI | 3000-6000 px | 10-50 MB |
| Archival/Museum | 600-1200 DPI | 6000-12000 px | 50-200+ MB |
✅ Good to Know
💡 The 300 DPI Rule
300 DPI is the industry standard for high-quality print. Anything less may look pixelated when printed. For web and screen viewing, 72-150 DPI is sufficient.
Print vs Web Resolution: Key Differences
🖨️ For PRINT
- • Requires 300 DPI minimum
- • File sizes are larger (2-10 MB per image)
- • Color profile: CMYK preferred
- • Sharp details matter
- • Soft proof before printing
💻 For WEB
- • 72-150 DPI is sufficient
- • File sizes are smaller (100-500 KB)
- • Color profile: sRGB preferred
- • Load speed matters most
- • Optimize for retina displays (2x size)
How to Check Your Image Resolution
Windows:
Right-click image → Properties → Details → Look for "Horizontal resolution" and "Vertical resolution"
Mac:
Right-click image → Get Info → More Info → Look for "Dimensions" and "Resolution"
Online Tools:
Use our resolution checker tool (coming soon) or free online image metadata viewers.
💡 Pro Tip
⚠️ Common Mistake
Don't confuse image resolution with image dimensions. A 4000x3000 pixel image at 72 DPI can print at 13x10 inches. The same image at 300 DPI prints at 3.3x2.5 inches. Size affects resolution!
Can You Improve Low Resolution Images?
Short answer: Not really. You cannot add detail that doesn't exist.
Long answer: AI upscaling tools can help, but they "guess" missing pixels. For critical documents, always start with high-resolution source images.
❌ What DOESN'T work:
- Simply increasing DPI in Photoshop
- Zooming in on a small image
- Saving a low-res image at high DPI
✅ What CAN help:
- AI upscaling tools (Topaz Gigapixel)
- Scan original at higher resolution
- Vector conversion for logos/graphics
Frequently Asked Questions
A: 150-300 DPI is ideal. 150 DPI for screen viewing, 300 DPI for print.
A: Yes, for screen viewing only. They will look pixelated when printed.
A: Calculate: (pixel width ÷ inches needed) = DPI. For 8" print at 300 DPI, need 2400 pixels width.
A: Modern PDF compression maintains resolution while optimizing file size through better encoding.
Ready to Create High-Resolution PDFs?
Convert your images to PDF while maintaining optimal resolution.
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