DPI (Dots Per Inch) affects how images appear in print. Understanding DPI helps you choose the right settings for your purpose.
What is DPI?
DPI measures how many dots (or pixels) fit in one inch when printed.
- Higher DPI = More detail, larger file, better print quality
- Lower DPI = Less detail, smaller file, sufficient for screens
DPI for Different Uses
| Purpose | DPI | Why |
|---|---|---|
| Web/Screen | 72 | Standard screen resolution |
| Presentations | 96-150 | Good screen quality |
| General Print | 150-200 | Acceptable quality |
| Professional Print | 300 | Industry standard |
| Large Format | 150 | Viewed from distance |
72 DPI for Web
- Standard screen resolution
- Smaller file sizes
- Faster loading
- No quality loss on screens
300 DPI for Print
- Professional print standard
- Sharp text and details
- Required for brochures, cards, posters
- Larger file sizes
Common Misconception
DPI doesn't affect screen display. A 72 DPI image looks identical to a 300 DPI image on a monitor—only file size differs. DPI matters only for print.
How to Set DPI
- Open Rune's Image Resizer.
- Upload your image.
- Adjust the DPI slider (72-300).
- Set dimensions and quality.
- Download.
Calculating Print Size
Print size = Pixels ÷ DPI
Example: 1800 x 1200 pixels at 300 DPI = 6" x 4" print
When to Increase DPI
- Preparing images for professional printing
- Creating assets for print design
- Exporting for high-quality reproduction
Conclusion
Use 72 DPI for web, 300 DPI for print. Rune's Image Resizer lets you set DPI for any purpose.