Image DPI for printing, explained
Updated 26 September 2026
Tool for this guide: DPI checker
Short answer: DPI (or PPI) is only a label that tells printers how large to print an image. What decides print quality is the number of pixels. For sharp prints, aim for 300 pixels per inch of print.
How big can I print my photo?
Divide the width and height in pixels by 300 to get the size in inches at good quality.
| Pixels | At 300 DPI | At 150 DPI |
|---|---|---|
| 1200 × 800 | 4 × 2.7 in (10.2 × 6.8 cm) | 8 × 5.3 in |
| 3000 × 2000 | 10 × 6.7 in (25.4 × 16.9 cm) | 20 × 13.3 in |
| 4000 × 3000 | 13.3 × 10 in (33.9 × 25.4 cm) | 26.7 × 20 in |
| 6000 × 4000 | 20 × 13.3 in (50.8 × 33.9 cm) | 40 × 26.7 in |
150 DPI is fine for posters viewed from a distance.
Does changing DPI change the image?
No. Changing the DPI from 72 to 300 only edits a number stored in the file. The pixels, and how the image looks on screen, stay exactly the same. It's useful when a print shop or form insists on "300 DPI".
Check and change DPI
- Open the DPI checker and add your images.
- You'll see the saved DPI and the print size it gives.
- To change it, choose 300 DPI (or any value) and download. JPG and PNG files are updated without re-compressing.
Why does my image say 72 DPI?
72 and 96 DPI are common defaults on computers and phones. They don't mean the image is low quality. A 4000-pixel-wide photo labelled 72 DPI prints just as sharply as the same photo labelled 300 DPI once the printer is told the size you want.
Screens ignore DPI
On websites and in apps, only pixel dimensions matter. Use the image resizer to change how big an image appears on screen.
Check your image's DPI
Use the free DPI checker to see an image's DPI and print size, then change it to 300 DPI. Step by step: how to check the DPI of an image.
Try it now
Check the DPI (resolution) saved in an image, see how large it will print, and change the DPI without touching the pixels.
Open dpi checker