20 KB leaves little margin, so every decision counts: this tool finds the optimal combination of quality and dimensions to squeeze the most out of the limit. It is the typical cap for forum avatars, corporate email signatures and some legacy document systems.
For best results, start from an image already cropped to the subject (a face, a logo): the fewer irrelevant pixels, the more quality fits into those 20 KB.
How it works
- 1
Drop your images: the target is already set to 20 KB.
- 2
Quality (and dimensions, if needed) are tuned automatically.
- 3
Check the final size on each card and download.
Frequently asked questions
What fits in 20 KB?
An avatar or portrait of roughly 300–400 px per side at acceptable quality, or a simple logo. For documents with readable text, 20 KB is usually not enough — use 50 or 100 KB if the platform allows it.
Why did my image come out smaller in pixels?
If even minimum quality cannot meet the target, the tool also reduces dimensions: it is the only mathematically possible way to respect the limit.
Are my images uploaded to a server?
No. All processing happens inside your browser using the Canvas API: your files never leave your device, there are no upload queues, and the tool even works offline once the page has loaded.