Change Image DPI to 300New
Set the DPI stored inside a PNG or JPG to 300 (or 150, 72, or any custom value) so print software stops flagging it — batch, with nothing re-encoded and nothing uploaded.
Runs in your browser — your files are never uploaded.
How to change a PNG or JPG's DPI to 300
Pick a DPI, drop in your PNG or JPG files, and download — the tool rewrites the DPI record stored inside the file and nothing else. It doesn't resize, resample or re-save the image data, so there's no quality loss and no wait: the whole thing runs on your own device.
- Choose a DPI — 300 for sharp, close-up prints, 150 for large-format prints viewed from further away, 72 for on-screen use, or type any custom number.
- Drop your images — PNG or JPG, one file or a whole batch.
- Check the print size shown on each card, and the quality badge — it tells you honestly whether that DPI will look sharp at your file's pixel size.
- Download a single file or everything at once as a ZIP.
Why print software rejects a “72 DPI” file
Every PNG and JPG can carry a small DPI record — the PNG pHYs chunk or the JPG JFIF density field — that tells a printer or print-on-demand partner how many of the image's pixels should land in each printed inch. Cameras, phones and most design tools default to 72 or 96 DPI, which is a leftover from early screen resolutions and has nothing to do with how many pixels the file actually has. Some print pipelines check that tag and warn or reject the file even when the pixel count is genuinely large enough — changing the tag to 300 clears that warning in seconds.
What the tag can't do is add detail. A 600 × 600 px image is still only 600 × 600 px after this tool sets it to 300 DPI — it will now print at a tiny 2 × 2 inches at that resolution instead of a soft 8.3 × 8.3 inches at 72 DPI. If you need it to print bigger and stay sharp, the pixels have to come from somewhere: use the AI Image Upscaler to add real detail first, then set the DPI here. The DPI Calculator is useful for checking exactly what size a given pixel count prints at before you commit.
What DPI should I use?
| DPI | Best for |
|---|---|
| 300 | Posters, framed prints, anything viewed up close |
| 150 | Large canvases, banners, big prints viewed from further away |
| 72 | On-screen use — DPI has no visual effect on a monitor |
Common mistakes
- Expecting the tag to fix a small file. If your design is genuinely low-resolution for the print size, no DPI tag changes that — upscale first.
- Setting a huge custom DPI to “trick” a checker. Some tools also compare the DPI against the pixel size and will still flag a mismatch — keep the tag honest and upscale if you need to.
- Re-saving through an editor afterwards. Opening the file again in some apps and re-exporting can reset the DPI tag back to a default — set it as your last step before uploading.
FAQ
Does changing the DPI make my image sharper?
No. DPI is a label stored inside the file that tells a printer how many pixels to fit per inch — it doesn't add or remove any pixels. If your file is too small for the print size you want, upscale it first, then set the DPI.
Why does Etsy or my print-on-demand partner say my file is the wrong DPI?
Most screenshots and web-exported images are saved at 72 DPI, and some print software reads that tag and rejects the file even though the pixel count might be fine. Setting the tag to 300 DPI here fixes that check instantly, as long as the image already has enough pixels for the size you're printing.
Does this recompress or resize my image?
No. The tool edits only the small DPI record inside the file (the PNG pHYs chunk or the JPG JFIF density field) and leaves every pixel byte exactly as it was — there is no re-encoding, so there is no quality loss.
What DPI should I use?
300 DPI is the standard for posters, framed art and anything viewed up close. 150 DPI is fine for large banners and canvases viewed from further away. 72 DPI is the historical default for screens and doesn't matter for on-screen use.
Does my image get uploaded anywhere?
No. Every file is read and rewritten in your browser, on your own device. Nothing is sent to a server, so there's no upload wait and your unreleased designs stay private.
Why only PNG and JPG?
PNG and JPG are the only common formats with a standard place to store a DPI value that print software actually reads (the pHYs chunk and the JFIF density field). WEBP and other formats don't have a widely supported equivalent.