Set the DPI of a JPG or PNG to 200, 300, 600 or another value. Printers, photo labs and many application forms ask for 200 or 300 DPI. You can convert several images in one go.
Upload it, select 300 DPI and download. The new file reports 300 DPI in its properties.
Changing only the DPI value keeps the same pixels and changes the print size. To get more pixels, resize or upscale the image.
No. The tool runs in your browser, so the image stays on your phone or computer.