smaller file
Compress an image without sending it anywhere
For upload limits, email attachments and pages that load slowly. Choose how far to push and the result tells you exactly how much came off.
Files are processed on your device · nothing is uploaded, stored or logged
How it works
Pick your file. The browser opens it straight from disk. There is no upload, so there is nothing to wait for.
Nothing is downloaded first. Unlike the video tools, image conversion uses what is already built into your browser. It starts instantly.
Your machine does the work. The image is drawn to a canvas and written out in the new format, which takes a fraction of a second.
Save the result. The file goes straight to your downloads folder and the original is untouched.
What compression actually removes
JPEG compression works by discarding detail the eye is least likely to notice — subtle variation in busy areas, fine gradients, the exact edges of textures. The harder you push, the more of it goes.
Photographs tolerate this remarkably well, which is why the format has survived thirty years. Screenshots and graphics tolerate it badly, because sharp edges and flat colour are exactly what the algorithm handles worst.
The dimensions are untouched. A 4000 pixel wide image comes back 4000 pixels wide; what changes is how much data describes each one.
The step most people skip
If a photo is still too large after compressing, the answer is usually to make it smaller in pixels rather than to compress harder. A 4000 pixel image displayed at 800 is carrying five times the detail anyone will see. Resizing removes that waste without any visible cost, and the two together achieve far more than either alone.
Common questions
How much smaller will it get?
Photographs typically drop by half to three quarters at the Balanced setting. Screenshots compress less well and may be better served by resizing.
Do the dimensions change?
No. Only the amount of data per pixel changes.
Can I compress the same image twice?
You can, but each pass discards more and the artefacts accumulate. Going back to the original gives a better result.
Is my image uploaded?
No, everything runs in this tab.