Quick answer: 10 KB is very small: a photo usually ends up a few hundred pixels wide. Use JPEG, crop to the important part, and let the optimizer find the highest quality that fits. Open the optimizer with 10 KB selected — your image stays on your device.
How to compress an image to 10 KB
- Open the Exact Image KB Optimizer; 10 KB is already selected.
- Add your image: choose, drag or paste a JPG, PNG or WebP file (or several).
- Press Compress to 10 KB. The tool tries the highest quality first and measures every result.
- Check the result — size, dimensions, format and a before/after comparison — then download it.
What fits in 10 KB
At 10 KB a detailed photo has to shrink a lot; simple graphics and signatures keep more pixels.
| Image | Result at 10 KB |
|---|---|
| Detailed 12-megapixel photo (4000 × 3000 px) | 318 × 238 px, JPEG |
| Simple graphic with text (1600 × 900 px) | 465 × 262 px, JPEG |
Measured with the optimizer in Chrome in October 2026. Your results depend on the image: smooth or simple images keep more pixels than busy, detailed ones.
Is 10 KB counted as 10,000 or 10,240 bytes?
Both conventions are in use: some sites count 1 KB as 1,000 bytes, others as 1,024. The optimizer aims under the stricter 10,000 bytes, so the result passes either way. The target is a maximum: the file will be at or below 10 KB, usually just under it.
Getting a good result at a very small size
- Crop to what matters first — a signature, a face or a logo — before compressing; every pixel you remove leaves more room for quality.
- Use JPEG. PNG is lossless and usually has to shrink a lot to reach a target this small.
- For scanned signatures, a clean scan on white paper compresses far better than a photo of a page.
- Expect small dimensions: a few hundred pixels across is normal for a photo at this size.
If the target cannot be reached
Very detailed or noisy images may not fit even at small dimensions. The optimizer then tells you the smallest size it could reach instead of producing a broken file. Cropping the image, or choosing a slightly larger target if the form allows it, usually solves this.
Frequently asked questions
Can a photo really be under 10 KB?
Yes, but it will be small — about 300 px across for a detailed photo in our test. Cropping first keeps the subject larger.
Is 10 KB enough for a signature?
Usually. A signature on a plain background compresses very well, so it can stay much larger than a photo at the same size.
Why not just lower the JPEG quality more?
Below a certain quality, images break up into visible blocks. The optimizer stops at a minimum quality and reduces the dimensions instead.
Does it work for PNG?
PNG can only get smaller by shrinking. For 10 KB, JPEG almost always gives a better result; the tool offers to switch.
Related
- Exact Image KB Optimizer (10 KB selected)
- Compress an image to 20 KB
- Compress an image to 30 KB
- Image Requirements Checker — check a file against size, shape and format rules
- Social media image sizes