Set your photos to 300 DPI (or any value) for printing, print shops, Etsy, KDP or forms that ask for a specific resolution. Pixels stay exactly the same, so there is zero quality loss.
Drop images here or choose files
JPG, PNG, WebP, GIF, BMP · up to 200 at once · files never leave your device
Each image gets the DPI that makes it print exactly this wide.
Everything runs inside your browser. Your images are never uploaded to a server, which also makes it fast for large batches.
DPI (dots per inch, also called PPI) is a small label stored inside the image file. It tells printers and design apps how many of the image's pixels to place in one inch of paper. It does not add or remove pixels.
A 3000 × 2400 pixel photo labelled 72 DPI is meant to print at 41.7 × 33.3 inches. The same pixels labelled 300 DPI print at 10 × 8 inches, sharp enough for a photo print. The file looks identical on screen either way.
That is why this tool edits only the label (the JFIF and EXIF fields in a JPG, the pHYs chunk in a PNG). The image data is copied byte for byte, so there is no recompression and no quality loss.
No. If an image only has 600 × 400 pixels, it can only print sharply at about 2 × 1.3 inches. Changing the label to 300 DPI makes it print at that small size, which is honest; it cannot invent detail. Use the DPI checker to see the largest size each image prints well at, or the print size calculator to see how many pixels a print needs.
No. This tool changes only the DPI value stored in the file. The pixels are copied unchanged, so the image is exactly as sharp as before.
Yes. Add up to 200 images, set one DPI value, and download them all in a single ZIP file.
No. All processing happens in your browser on your own device. Nothing is sent to a server.
JPG and PNG keep their format and are changed losslessly. WebP, GIF and BMP cannot store a DPI value reliably, so they are saved as PNG with the DPI you choose.
If a file has no DPI stored, Windows shows 96. After using this tool, right-click the new file, choose Properties, then Details, and you will see the new value.
300 DPI is the standard for photos and printed documents. 150 to 200 DPI is fine for large posters viewed from a distance. Many Japanese print shops ask for 350 DPI.