Free Image DPI Changer
Set a JPG or PNG to 300 DPI (or any value) in seconds — the pixels never change.
Drop your JPG or PNG images here
or click to browse · edited locally, never uploaded
Target DPI
Most forms and printers ask for 300 DPI. Only the DPI label inside the file changes — the picture is not decoded or saved again, so there is no quality loss and the file stays the same size.
Something not working?
Tell us what went wrong — it helps us fix the tool. Only what you type below is sent; your files never leave your device.
Need more power? Meet Image DPI Changer Pro
One-time payment. Yours forever. No subscription.
| Feature | Free | Pro |
|---|---|---|
| Images per run | Up to 10 | Unlimited batch |
| File size | Up to 20 MB each | Unlimited |
| JPG & PNG DPI editing | Yes | Yes |
| Current DPI readout & print-size preview | Yes | Yes |
| ZIP download for batches | Yes | Yes |
| Target print-size mode (set DPI from cm / inches) | — | Yes |
| WebP & HEIC support | — | Yes |
| Ads | Shown on page | Ad-free |
| Updates | — | Lifetime free updates |
Frequently asked questions
Is my image uploaded to your servers?
No. The DPI label is rewritten entirely inside your browser using JavaScript. Your photo never leaves your device — you can verify this in your browser's network panel, or disconnect from the internet after the page loads and keep converting.
Will changing the DPI make my photo sharper or larger?
No — and any tool that promises that is misleading you. DPI is only a label that tells printers and forms how big each pixel should be on paper. This tool rewrites that label and nothing else, so the pixels, the quality and the file size stay exactly the same. If a form only complains about DPI, that is all it needs. If it also asks for a minimum pixel size, use our Social Image Resizer to add pixels first.
Where is the DPI stored? Why do different programs disagree?
A JPG can carry the DPI in up to three places — the JFIF header, the EXIF camera data and a Photoshop block — and different programs read different ones. This tool sets all three so they agree. A PNG carries it in one place, the pHYs chunk, stored as pixels per metre (300 DPI becomes 11,811 pixels per metre, which some programs show as 299.999 — that is the closest a PNG can hold, and every program treats it as 300).
What DPI do I need?
300 DPI is the standard answer for print, passport photos, visa forms and exam portals. 150 DPI is usually fine for large posters viewed from a distance, and 72–96 DPI is enough for screens. When in doubt, pick the number the form or printer asked for.