Compress image to 20 KB.
Need a signature or photo under 20 KB for an exam or government form? Drop it in and we hit the target in one click, entirely in your browser, so your image never leaves your device. No watermark, no signup, no upload limits.
Exact
Auto-tunes to your target
Private
Never leaves your device
Nothing stored
No upload at all
How it works
- 01
Add your image
Drop in a JPG, PNG or WebP photo or signature, or click to browse. It stays on your device. Nothing is uploaded.
- 02
We hit 20 KB
Your browser re-encodes the image, automatically finding the quality (and, if needed, size) that lands at or under 20 KB.
- 03
Download it
Grab the 20 KB image instantly. No upload, no server, no signup.
How many pixels fit in 20 KB
20 KB is 20,480 bytes, 163,840 bits. Quality drops first; then the size steps to 85, 70, 55, 40, 25 percent.
| Picture | Full size | At 70 percent | At 40 percent |
|---|---|---|---|
| 600 x 600 ID photo | 0.46 | 0.93 | 2.84 |
| 1280 x 720 screenshot | 0.18 | 0.36 | 1.11 |
| 1920 x 1080 picture | 0.079 | 0.16 | 0.49 |
| 4032 x 3024 phone photo | 0.013 | 0.027 | 0.084 |
| Bits per pixel | Pixels | Square |
|---|---|---|
| 8 | 20,480 | 143 x 143 |
| 4 | 40,960 | 202 x 202 |
| 2 | 81,920 | 286 x 286 |
| 1 | 163,840 | 404 x 404 |
| 0.5 | 327,680 | 572 x 572 |
| 0.25 | 655,360 | 809 x 809 |
- Fewer bits per pixel, harder squeeze: a big phone photo shrinks before it reaches 20 KB.
Common questions
Why compress to 20 KB?+
A 20 KB cap is one of the most common limits on exam and government application forms, especially for scanned signatures and passport photos. This gets you under it in one click.
Will a signature still be readable at 20 KB?+
Yes. Signatures and line art compress very well, so 20 KB is usually plenty. For a busy colour photo we also gently reduce the dimensions so it still fits while staying usable.
Is my image uploaded anywhere?+
No. This runs entirely in your browser using your device's own processor. Your image never leaves your computer or phone. Ideal for ID photos and signatures you'd rather not upload.
What if it can't reach 20 KB?+
For large or detailed images we reduce the dimensions too. If it still can't fit while staying usable, we give you the smallest version and tell you, never a broken file.
Which formats work?+
JPG, PNG and WebP. The result is a JPG (or WebP) since those compress to a precise size.
Is there a limit or watermark?+
No watermark, no signup, free, and since it's all in your browser, no upload size limits either.
More compression tools