DPI converter: change an image to 300 DPI
Change a JPG or PNG to 300 DPI, or any number, and keep every pixel. Or resize it to the pixels a print needs, like 1200 x 1800 for 4x6. Free, no upload.
Change a JPG or PNG to 300 DPI, or any number, and keep every pixel. Or resize it to the pixels a print needs, like 1200 x 1800 for 4x6. Free, no upload.
To change an image to 300 DPI, SafeResize writes 300 into the DPI field of your JPG or PNG and changes nothing else, so every pixel stays the same.
| What changes | Only the DPI number saved in the file. The pixels, the picture and the file type stay the same. |
|---|---|
| Print size at 300 DPI | The pixels divided by 300: a phone photo of 3024 × 4032 pixels prints 10.08 × 13.44 inches |
| Pixels for prints at 300 DPI | 4 × 6 inches: 1200 × 1800. 5 × 7 inches: 1500 × 2100. 8 × 10 inches: 2400 × 3000. |
| Files it works on | JPG and PNG. Other kinds, such as WebP and HEIC, have no standard place for a DPI. |
DPI (dots per inch) is a number saved inside a JPG or PNG that tells a printer how big to print it. It does not make the picture sharper: the pixels decide that. A photo of 1200 × 1800 pixels prints 4 × 6 inches at 300 DPI, and about 16.7 × 25 inches at 72 DPI, with the same detail spread wider.
This page opens Resize a photo with "Change only the DPI" chosen and 300 filled in. Add a JPG or PNG and press "Next". You get the same file with only its DPI changed, in the places where Windows and photo programs look for it. Not one pixel changes, and the picture is not saved again, so no quality is lost.
A form or a print shop that asks for 300 DPI can mean one of three things. Pick the one that matches what you have:
Add the JPG or PNG on this page: "Change only the DPI" is chosen and 300 is filled in. Press "Next" and download. The pixels stay exactly as they were; only the number saved in the file is new.
No. The DPI only tells a printer how big to print. The sharpness comes from the pixels, and they do not change here. For a sharper print at the same size, the photo needs more pixels.
Hardly. At most a few dozen bytes are added, and the picture itself is not saved again, so there is no loss of quality.
JPG and PNG. Other kinds, such as WebP, GIF or HEIC, have no standard place for a DPI, so the tool tells you. Save the photo as a JPG first, or use "My own size" in inches or cm, which makes a JPG with the DPI saved in it.
It depends on the print size: multiply the inches by 300. A 4 × 6 inch print needs 1200 × 1800 pixels, 5 × 7 needs 1500 × 2100, and 8 × 10 needs 2400 × 3000. In centimetres, 300 DPI is about 118 pixels for each cm.