Drop a JPG or PNG, pick the DPI your print shop asks for and download it. Only the DPI value changes; the pixels stay exactly the same, and nothing is uploaded.
Drop the image into the converter above, choose 300 DPI (or 72, 150, 600 or any value) and click download. The new file keeps its name with the DPI added, for example photo-300dpi.jpg.
In Photoshop the same setting lives under Image → Image Size with Resample switched off; on a Mac, Preview's Tools → Adjust Size does it with Resample image unchecked.
No. DPI is a label that tells printing software how many pixels to place per inch. Changing it from 72 to 300 makes the suggested print size smaller, but the image has exactly the same pixels and the same sharpness.
That is also why this converter is lossless: it rewrites the DPI value in the file header and leaves the image data untouched, so there is no re-compression.
Many print shops and upload forms check the DPI value and reject files saved at 72 DPI, even when the pixels are plenty. Setting the label to 300 gets the file through. What decides whether the print is sharp is the pixel count: the table above shows how big your image prints well.
| 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 |
If the table shows Fair or Poor at the size you want, changing DPI won't help. AI upscaling adds real detail, so a 2× or 4× upscale turns those sizes into Good or Excellent.
FAQ
Quick answers about DPI values and print quality.
Drop it into the converter on this page, keep 300 DPI selected and download. The file gets the new DPI value without any change to its pixels.
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