Compress Image to 20 KB
Drop a photo and get a JPG of 20 KB or less. The tool tests different qualities and keeps the highest one that fits, so you do not have to guess with a slider. Nothing is uploaded.
How the 20 KB compressor works
Best quality that fits
Instead of one fixed quality, the tool tries several and keeps the highest one that stays under 20 KB. A simple photo may stay at 90% quality; a detailed one may need less.
Shrinks pixels only if it must
Quality is lowered first, down to 50%. If the image is still too large it is scaled down in small steps until it fits, so you do not lose more resolution than necessary.
Typical use at 20 KB
This size is commonly needed for signatures, small profile pictures and the smallest upload limits on application and exam forms.
Private by design
The search runs in your browser. IDs, signatures and documents are never uploaded to any server.
How to compress an image to 20 KB
- Set the target — it starts at 20 KB; change the number or pick 20, 50, 100, 200 or 500 KB.
- Upload — drop your image(s) onto the box or click to browse.
- Download — the result shows its dimensions, the quality used and the final size.
What we measured
We took a 4000 x 2667 camera-style photo (2.15 MB, a real photograph enlarged with sensor-style noise) and ran it through this tool.
| Setting | Result |
|---|---|
| Target | 20 KB or less |
| Result | under the limit, checked in the real page |
| Dimensions | 512 x 342 |
| JPG quality used | 51% |
The tool lowers quality first and shrinks pixels only when it has to. Full method and numbers: how to compress an image to a specific size.
Frequently asked questions
Will the file really be under 20 KB?
Yes. The limit is 20 x 1024 bytes, the way most upload forms count a kilobyte. If an image cannot be made that small without becoming unusable, the tool says so instead of pretending, and gives you the smallest it can do.
Why does my image get smaller in pixels at 20 KB?
Quality alone cannot always get a large photo under 20 KB. The tool lowers quality first, down to 50%, and only then shrinks the pixel dimensions, in the smallest steps that make it fit.
What if my image is already under the limit?
A JPG that is already under your target is returned unchanged, so it is not degraded by being re-compressed.
What format is the output?
Always JPG, because it gives the smallest files for photos and is accepted by almost every upload form. Transparent areas of a PNG are filled with white.
Why is there a tip about dimensions?
At 20 KB a photo has to be small. Expect roughly passport-thumbnail dimensions; if the form also asks for a minimum width and height, resize first and then compress.
Is this tool free?
Yes — every tool on ConvertPicto is completely free, with no account, no watermark and no file limits. The site is supported by ads.
Are my images uploaded to a server?
No. ConvertPicto runs entirely inside your browser using the Canvas API. Your files are read locally, processed on your device and never sent anywhere — we don't even have a server that could receive them.
Does it work on my phone?
Yes. The site is fully responsive and works in any modern mobile browser (Chrome, Safari, Firefox, Edge). Processing large images is naturally slower on a phone than on a laptop.
Guides worth reading
