Drop files here, or click to browse
Drop one or many images, or a whole folder. You can also paste with Ctrl+V.
How to use
Add your images
Drop, paste or import JPG, PNG or other images. The first file's pixel size and stored DPI appear at the top, or a note that no DPI is stored.
Pick the DPI and mode
Tap 72, 96, 150, 200, 300 or 600, or type any value. Keep Only the DPI value to leave the pixels alone, or choose Resize for a print size and enter a width.
Download
Press Set 300 DPI (or your value). Files save with a -300dpi suffix, and several files download as one ZIP. The result line shows the print size in cm and inches.
Why Change Image DPI
- Lossless DPI change for JPG and PNG, pixels untouched.
- Optional resize to a print width in cm, mm or inches.
- Shows the stored DPI and the resulting print size.
- Bulk mode with one ZIP, all in your browser.
Pixels, DPI and print size
Print size equals pixels divided by DPI. The same photo can print small and sharp or large and soft, depending only on the DPI you give it. Use the table to see how many pixels you need for common sizes.
For sharp prints, aim for 300 DPI at the final size. For screens, DPI does not matter at all; only the pixel size does.
| Print size | Pixels at 300 DPI | Pixels at 150 DPI |
|---|---|---|
| 3.5 x 4.5 cm passport photo | 413 x 531 | 207 x 266 |
| 2 x 2 in photo | 600 x 600 | 300 x 300 |
| 4 x 6 in print | 1200 x 1800 | 600 x 900 |
| 5 x 7 in print | 1500 x 2100 | 750 x 1050 |
| A4 (21 x 29.7 cm) | 2480 x 3508 | 1240 x 1754 |
Why forms ask for 300 DPI
Exam and job portals often copy print rules into their upload instructions, so they ask for 300 DPI even though they show the photo on screen. What they usually check is the value stored in the file, plus the pixel size and the size in KB.
Set the DPI here without changing the pixels, then check the other limits. If the form also gives a size in cm, use Resize for a print size, or the Image Resizer, which can hit a KB limit too.