Change Image DPI
Set the DPI metadata of an image for printing, without touching the pixels.
Fill in the form and press “Set DPI” to see the result here.
How to use it
- 1Choose your file, or drag it onto the upload area.
- 2Adjust the options if you need something other than the defaults.
- 3Press the button. The conversion runs on the server and returns immediately.
- 4Download the result. The server copy is deleted as soon as you do.
About the Change Image DPI
DPI is metadata. Changing it does not alter a single pixel and does not make an image sharper - it tells a printer or a layout application how large to render the image on paper.
A 3000 pixel wide image at 300 DPI prints 10 inches wide; the same file at 72 DPI prints 41 inches wide and looks blurry. The pixels are identical in both cases.
Screens ignore DPI entirely. If a print shop asks for 300 DPI, what they usually need is enough pixels for the physical size - which means resizing, not relabelling.
Questions people ask
Will this make my image print more sharply?
No. DPI is a label. To improve print sharpness you need more pixels, which means a higher resolution original - no tool can add detail that was never captured.
Why does this tool upload my file when the others do not?
Because the software it needs does not exist in a browser. Most tools here run entirely on your device; the ones that need FFmpeg, LibreOffice or a full PDF engine cannot. Those run on an isolated worker with no network access, and the file is deleted as soon as the result is sent to you.
What happens to the file I upload?
It is stored under a random name that is not guessable, processed by an isolated worker, and deleted as soon as you download the result - and in any case automatically after 60 minutes. Uploads are never indexed, shared or used for anything besides producing your result.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.