Compress image to 20KB
The strictest portal limit there is — met honestly, with dimensions and quality balanced on your own device.
Drop your image here
or
JPG, PNG, WebP, HEIC, SVG — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
20KB is where upload limits get brutal: scanned signatures for exam forms, thumb impressions, avatar fields on old systems, and the stricter tiers of government portals. At this size there is no room for waste — a full-resolution phone photo carries five hundred times too much data. This tool makes the cut honestly: highest fitting quality first, then measured dimension steps, never a blind resize that leaves your signature an unreadable smear.
The trick to a good 20KB file is starting from the right crop: a signature cropped tight to the ink compresses beautifully, while a whole sheet of paper wastes the budget on white space. Crop first, compress here second — and the result stays on your device, which is exactly where scans of your signature belong.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Choose quality or size
Pick a quality preset, set an exact KB target, or switch the output format — tuned for compress image to 20kb.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Can a photo really fit in 20KB?
Yes, at modest dimensions — 20KB carries a clear image around 300 to 500 pixels wide, which is precisely what signature and thumbnail fields display. The tool reduces dimensions as far as needed and refuses honestly in the rare case nothing fits.
My signature looks faint after compression — what helps?
Crop tight around the ink before compressing, and photograph or scan on clean white paper with strong light. The less empty background the 20KB budget has to carry, the more of it goes to the strokes that matter.
Why do exam portals demand such tiny files?
Their systems were built for dial-up-era storage budgets and display the uploads at small sizes anyway. Fighting the limit doesn't help — meeting it precisely with maximum retained quality does, which is what the exact-size search here is for.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.