Support: DPI Changer
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Common questions
How do I change an image to 300 DPI?
Open the JPG or PNG here, leave the DPI at 300, and download it. The file now carries a 300 DPI label, with its pixels and quality exactly as before. If a form or a printer was rejecting it for being 72 DPI, that is all it needed.
Does changing the DPI reduce the quality?
Not with this tool. It rewrites only the few bytes that hold the label and copies everything else across untouched, so the picture is never decoded or compressed again. Changing the DPI in an image editor usually re-saves the whole file, which for a JPG loses a little detail each time.
Will 300 DPI make my image print sharper?
No. Sharpness depends on how many pixels there are for each printed inch, and a label cannot add pixels. An image 600 pixels wide is good for a 2 inch print at 300 DPI whatever its label says. Use the [DPI Checker](/tools/dpi-checker/) to see whether an image has enough pixels for the size you want.
Why does my image say 72 DPI or 96 DPI?
Because the camera, phone, screenshot tool or website that made it wrote that default into the file, or wrote nothing and your software assumed it. It says nothing about the quality of the image. A 24 megapixel photo labelled 72 DPI has exactly the same detail as one labelled 300.
Why do different programs show different DPI for the same file?
A JPG can keep the resolution in up to three places: its basic header, the camera information block, and a block added by Photoshop. Programs do not all read the same one, so when they disagree you see two numbers for one file. This tool sets every one that is present, so they all match.
Does the file size change?
Hardly at all. If the file already had a label, the new one takes the same space and the size is identical to the byte. If it had none, the file grows by about 20 bytes to hold it.
Why does my PNG show 299.999 DPI instead of 300?
PNG stores resolution in whole pixels per metre, and 300 per inch is 11,811.02 per metre, so the nearest value a PNG can hold works out to 299.9994. Every program rounds it to 300. It is a limit of the PNG format, not of this tool.
Can I change the DPI of WebP, GIF or HEIC images?
Not here. Those formats either have no resolution label or almost no software reads it. Convert the image to JPG or PNG first, then set the DPI.
Are my images uploaded?
No. The images are read and relabelled by your browser on your own device. They are never sent to us or to anyone else, and closing the tab clears them.