Drop a photo to see its pixel size, stored DPI and how sharp it will print at every common size. Nothing is uploaded: the check runs in your browser.
Drop the image into the checker above: it reads the pixel dimensions and the DPI stored in the file. On Windows you can also right-click the file and open Properties → Details; on a Mac, open it in Preview and choose Tools → Show Inspector.
The DPI in a file is a single number that printing software reads as a suggestion. A 4,000 × 3,000 photo saved at 72 DPI and the same photo saved at 300 DPI contain exactly the same pixels and print exactly the same. That is why the checker grades each size by pixels, not by the stored DPI.
Aim for 300 pixels per inch on small prints and about 150–240 on large ones that hang further away. The table shows the exact pixels each size needs and how close your image gets.
| Print size | Pixels at 300 DPI | Recommended |
|---|---|---|
| 4 × 6 in (10 × 15 cm) | 1,200 × 1,800 | 1,200 × 1,800 at 300 DPI |
| 5 × 7 in (13 × 18 cm) | 1,500 × 2,100 | 1,500 × 2,100 at 300 DPI |
| 8 × 8 in (20 × 20 cm) | 2,400 × 2,400 | 2,400 × 2,400 at 300 DPI |
| 8 × 10 in (20 × 25 cm) | 2,400 × 3,000 | 2,400 × 3,000 at 300 DPI |
| 8 × 12 in (20 × 30 cm) | 2,400 × 3,600 | 2,400 × 3,600 at 300 DPI |
| A4 · 8.3 × 11.7 in (21 × 29.7 cm) | 2,490 × 3,510 | 2,490 × 3,510 at 300 DPI |
| 12 × 12 in (30 × 30 cm) | 3,600 × 3,600 | 3,600 × 3,600 at 300 DPI |
| 11 × 14 in (28 × 35.5 cm) | 3,300 × 4,200 | 3,300 × 4,200 at 300 DPI |
| 12 × 16 in (30 × 40 cm) | 3,600 × 4,800 | 3,600 × 4,800 at 300 DPI |
| A3 · 11.7 × 16.5 in (29.7 × 42 cm) | 3,510 × 4,950 | 3,510 × 4,950 at 300 DPI |
| 12 × 18 in (30 × 45 cm) | 3,600 × 5,400 | 3,600 × 5,400 at 300 DPI |
| 16 × 20 in (40 × 50 cm) | 4,800 × 6,000 | 4,800 × 6,000 at 300 DPI |
| A2 · 16.5 × 23.4 in (42 × 59.4 cm) | 4,950 × 7,020 | 3,960 × 5,616 at 240 DPI |
| 18 × 24 in (45 × 60 cm) | 5,400 × 7,200 | 4,320 × 5,760 at 240 DPI |
| 20 × 30 in (50 × 75 cm) | 6,000 × 9,000 | 4,800 × 7,200 at 240 DPI |
| A1 · 23.4 × 33.1 in (59.4 × 84.1 cm) | 7,020 × 9,930 | 5,616 × 7,944 at 240 DPI |
| 24 × 36 in (60 × 90 cm) | 7,200 × 10,800 | 5,760 × 8,640 at 240 DPI |
| 30 × 40 in (75 × 100 cm) | 9,000 × 12,000 | 7,200 × 9,600 at 240 DPI |
| A0 · 33.1 × 46.8 in (84.1 × 118.9 cm) | 9,930 × 14,040 | 5,958 × 8,424 at 180 DPI |
| 40 × 60 in (100 × 150 cm) | 12,000 × 18,000 | 7,200 × 10,800 at 180 DPI |
AI upscaling adds real detail instead of stretching pixels, so a 2× or 4× upscale can turn a Fair or Poor rating into Good or Excellent. The table tells you which factor each size needs.
FAQ
Quick answers about DPI, pixels and print quality.
Drop it into the checker on this page. It shows the DPI stored in the file plus what actually matters: the pixel dimensions and the print sizes they support.
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