How to Change Image DPI

Changing an image’s DPI means changing the resolution value stored in the file’s metadata. It does not resize, sharpen, or add detail to the image.

What actually changes

If a 3000-pixel-wide image is labelled 300 DPI, software will suggest printing it 10 inches wide. Relabel it 150 DPI and the suggested width becomes 20 inches. The pixels are identical in both files.

What it cannot do

• It cannot turn a small image into a high-resolution print.
• It cannot recover detail that was never captured.
• It cannot make a blurry image sharp.

To genuinely increase print size at good quality, you need more pixels — a higher-resolution original, not a relabelled one.

How to do it here

Upload an image in the Change Image DPI tool, set a target DPI, and download the updated file. PNG output preserves transparency; JPEG output cannot, because JPEG has no alpha channel. All processing happens in your browser.

Try it: Change Image DPI · Image DPI Checker