Image DPI Converter
Set a JPG or PNG to 300 DPI without touching pixels.
Set the DPI a Printer or Form Asks For
Print shops, publishers and online application forms often insist on “300 DPI”. The DPI stored in an image is only a label that says how large to print it; the pixels are what count. Open a JPG, PNG or BMP to see its current DPI and the size it would print at, type the DPI you need, and download a copy with the new setting — every pixel untouched, so there is no quality loss.
The print size updates as you type: a 3000 × 2000 pixel photo at 300 DPI prints at 10 × 6.67 inches (25.4 × 16.9 cm). If that is too small for your print, the image needs more pixels, not a different label — the page explains the maths so you can check before you pay for printing.
Key features
- Lossless — only the DPI field changes; pixels and quality stay identical.
- Current DPI shown, including files that have none set.
- Print size calculator in inches and centimetres.
- JPG, PNG and BMP: JFIF and EXIF, pHYs, and the BMP header.
- Presets for 72, 96, 150, 300 and 600 DPI.
This tool does its work inside your browser using native Web APIs. The files and text you give it are processed on your device and are not uploaded to our servers.
How to use: Image DPI Converter
- Open the image
Drop a JPG, PNG or BMP onto the box. - Read the details
See the pixel size, the current DPI and the print size. - Set the DPI
Type a value or tap a preset such as 300. - Download
Press Download with new DPI; the file name notes the DPI.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Media |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Does changing the DPI change the quality?
No. DPI is metadata. The same pixels print smaller at a higher DPI and larger at a lower one — sharpness depends on the number of pixels.
How many pixels do I need for 300 DPI?
Multiply the print size by 300: a 4 × 6 inch print needs 1200 × 1800 pixels, an A4 page about 2480 × 3508.
Why does my file show 72 DPI?
Many phones and editors write 72 or no value at all. It does not mean the image is low quality — check the pixel dimensions.
Which formats are supported?
JPG, PNG and BMP, which store DPI in a way that can be changed without re-encoding.