Does changing DPI change my image quality?

No. DPI is just a print-density tag. In JPG, PNG, TIFF and BMP files we rewrite only that tag, so your pixels are untouched. WebP, HEIC, AVIF and GIF are saved once as a high-quality JPG or PNG of the same pixel size.

Why do print shops ask for 300 DPI?

300 dots per inch is the standard for sharp printed output. This tool sets that tag so their software accepts your file.

How big can I print my image at 300 DPI?

Divide the pixels by 300. A 3000 by 2400 pixel photo prints sharp at 10 by 8 inches. The DPI tag only tells the printer to use that density.

What is the difference between DPI and PPI?

Strictly, PPI is pixels per inch in the file and DPI is ink dots per inch on paper. In practice print shops use the words interchangeably and mean the value this tool sets.

Can I use a WebP, HEIC (iPhone) or AVIF image?

Yes. JPG, PNG, TIFF and BMP files keep every pixel: only the DPI tag is rewritten. WebP, HEIC, AVIF and GIF don't carry a DPI that Windows, print shops and online forms reliably read, so the tool saves the image as a high-quality JPG (or PNG if it has transparency or is a lossless graphic) at the same width and height in pixels, then sets the DPI. Everything happens on your device.

Change Image DPI — Free DPI Converter (300, 600, 150, 72)

Change image DPI to 300, 600, 150 or 72 without resizing — JPG, PNG, TIFF, WebP or HEIC. 100% free, no signup, no watermark, runs in your browser.

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JPG, PNG, TIFF: quality untouched · WebP, HEIC, AVIF, GIF: saved as JPG/PNG · never uploaded

"Please send the image at 300 DPI" is one of the most misunderstood requests in printing. DPI is not quality. It is a small number stored inside the file that tells print software how many of your pixels to place per inch of paper. Change the number and the picture itself does not change at all.

That is exactly what this tool does: it rewrites only the DPI tag, to 300, 600, 150, 72 or a value you type, and leaves every pixel as it was. No re-compression, no resizing, no loss. The file a print shop or a journal submission system rejected for saying 72 DPI is accepted once it says 300.

The honest part: the tag does not add detail. An image of 600 by 400 pixels tagged 300 DPI prints sharp at 2 by 1.3 inches and blurry at poster size, whatever the tag says. To know how large you can print, divide the pixel width by 300. If that is smaller than you need, you need more pixels, which is a job for the upscaler, not for DPI.

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Frequently asked questions

Does changing DPI change my image quality?: No. DPI is just a print-density tag. In JPG, PNG, TIFF and BMP files we rewrite only that tag, so your pixels are untouched. WebP, HEIC, AVIF and GIF are saved once as a high-quality JPG or PNG of the same pixel size.
Why do print shops ask for 300 DPI?: 300 dots per inch is the standard for sharp printed output. This tool sets that tag so their software accepts your file.
How big can I print my image at 300 DPI?: Divide the pixels by 300. A 3000 by 2400 pixel photo prints sharp at 10 by 8 inches. The DPI tag only tells the printer to use that density.
What is the difference between DPI and PPI?: Strictly, PPI is pixels per inch in the file and DPI is ink dots per inch on paper. In practice print shops use the words interchangeably and mean the value this tool sets.
Can I use a WebP, HEIC (iPhone) or AVIF image?: Yes. JPG, PNG, TIFF and BMP files keep every pixel: only the DPI tag is rewritten. WebP, HEIC, AVIF and GIF don't carry a DPI that Windows, print shops and online forms reliably read, so the tool saves the image as a high-quality JPG (or PNG if it has transparency or is a lossless graphic) at the same width and height in pixels, then sets the DPI. Everything happens on your device.

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🔒 Your files are processed on your device. This tool runs entirely in your browser — nothing is uploaded.