TLKey Takeaway
DPI (dots per inch) determines print quality — 300 DPI is the standard for sharp prints, 150 DPI works for large-format posters, and 72 DPI is for screens only. Check your image DPI before printing to avoid blurry results. Increasing DPI without adding pixels does not improve quality.
What Is DPI?
DPI (Dots Per Inch) = number of printed dots per physical inch.
- 72 DPI — Screen resolution. Terrible for print.
- 150 DPI — Acceptable for large prints viewed from distance
- 300 DPI — Gold standard for professional printing
A 3000×2000 pixel image prints at:
- 300 DPI → 10 × 6.67 inches (sharp)
- 150 DPI → 20 × 13.3 inches (acceptable)
- 72 DPI → 41.7 × 27.8 inches (blurry)
How to Check DPI Online
- Open minifypic.com/image-size
- Upload your image
- The tool shows: pixel dimensions, DPI/PPI, file size, format, EXIF data
- Calculate max print size: Pixels ÷ 300 = Print inches
DPI Requirements by Print Type
| Print Product | Recommended DPI | Viewing Distance |
|---|---|---|
| Business cards | 300 DPI | 6-12 inches |
| Brochures / flyers | 300 DPI | 12-18 inches |
| Photo prints | 300 DPI | 12-24 inches |
| Posters (small) | 200-300 DPI | 2-3 feet |
| Large posters | 150 DPI | 3-6 feet |
| Banners | 100-150 DPI | 6-10 feet |
| Billboards | 30-72 DPI | 30+ feet |
Common DPI Myths
❌ "72 DPI is for web, 300 is for print" — Websites don't care about DPI. They only care about pixel dimensions.
❌ "I can increase DPI to make it print-quality" — Increasing the DPI tag doesn't add pixels. It just makes the print smaller.
❌ "My phone only shoots 72 DPI" — Your phone shoots 12MP (4000×3000 pixels), which prints at 13.3×10 inches at 300 DPI. The DPI tag is irrelevant.
The Formula
Print Size (inches) = Pixel Dimensions ÷ DPI
Example: 8×10 inch print at 300 DPI needs 2400×3000 pixels.
Use the Image Resizer to set exact pixel dimensions for your target print size.
FAQ
Q: What DPI is my phone camera? A: The tag says 72, but what matters is pixels. 12MP = 4000×3000 = sharp 13×10 inch print at 300 DPI.
Q: Does changing DPI change file size? A: No. DPI is a metadata tag. It doesn't change pixels or file size.
Q: What DPI for a poster? A: 150-200 DPI for posters viewed from 3+ feet. 300 DPI for small posters viewed up close.
