Practical guide 3 min read
What DPI means, and how to get a 300 DPI image
Why DPI changes print size and not quality, how large your photo can print, and how to set 300 DPI without re-compressing it.
New
Tool
Change Image DPI
Printers, publishers and some forms ask for images at 300 DPI. DPI is a setting stored in the file that tells software how large to print it, so it can be changed without altering or re-compressing a single pixel.
Drop JPG or PNG images here
or
You can also paste an image with Ctrl+V (⌘V on a Mac).
Your images stay on your device. Nothing is uploaded.
How to change the DPI of an image
- Choose or drop your JPG or PNG images.
- Pick the DPI you need. The print size it gives is shown as you choose.
- Select “Change DPI” and download the images, pixel-for-pixel unchanged.
Private by design
Most online image tools upload your pictures to their servers. This one doesn’t: Change Image DPI runs entirely in your browser, so family photos, IDs, screenshots and client work never leave your device. It’s free, with no watermark and no limit on how many images you process, and you don’t need an account.
Questions
Does changing the DPI change the quality or the size in pixels?
No. A 3000 × 2000 pixel image is still 3000 × 2000 pixels. Only the print size changes: at 300 DPI it prints at 10 × 6.7 inches, at 150 DPI at 20 × 13.3 inches.
My printer says the image is too small for 300 DPI. What now?
Then there aren't enough pixels for that print size. Print it smaller, or accept a lower DPI. Enlarging with Resize Image adds pixels, but not real detail.
Which formats store a DPI?
JPG and PNG, and both are changed here without re-compressing. Formats with no DPI setting, such as WebP and HEIC, are converted to JPG or PNG first.
Are my images uploaded?
No. Every tool runs in your web browser, so your images are read, changed and saved on your own device and never sent to LabAnvil or anyone else. Once the page has loaded, the tools even work offline.
Is it free? Do I need an account?
Free, with no watermark, no daily limit, no account and no cap on file size beyond what your device's memory can handle.
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