How to use it
- Drop your image here, or paste it (Ctrl+V).
- Enter the KB limit, or choose a preset (photo, signature, document).
- Compress and download the result.
KB, pixels and DPI: what's the difference?
KB is the file size on disk, which is what most upload forms limit. Pixel dimensions are the width and height in dots; more pixels usually means a bigger file. DPI is only a note in the file header saying how large the image should print: it changes neither the file size nor the pixel count.
Many forms specify all three, for example: under 50 KB, 35×45 mm ratio, 200 DPI. Here you set them in one place: the image is cropped from the center to the pixel size, the DPI goes into the JPG header, and the file is compressed below the KB limit.
Presets and tips
The presets (photo up to 50 KB, signature up to 20 KB, scanned document 100 or 300 KB) are typical starting points; the exact rules of your form always win.
- For a signature, crop away the empty paper first.
- Sideways phone photos are rotated upright automatically when loaded.
- Need several files? Add them together; the ZIP also contains each one separately.
Nothing is uploaded: all processing happens in your browser.
Frequently asked questions
How much quality will I lose?
Only as much as the target requires. Above 100 KB the difference is hard to see on a typical photo; at 20 KB the image becomes small. Compare the result with the original using the slider.
Does changing DPI make the file smaller?
No. DPI only sets the print size; file size depends on the pixel count and the compression.
Does it work on my phone?
Yes. It runs in mobile browsers and also reads iPhone HEIC photos.
Last updated: November 13, 2026