Resize an image to an exact KB target

Compress and resize an image to an exact kilobyte target online, free. Honest reporting when a target cannot be met. No upload required.

Private workspace Your image stays on this device.

The resize, compress, and check tools load in your browser. Nothing is uploaded to a server — all processing happens on this device. If you are reading this, the interactive tool is still loading or JavaScript is disabled.

Some upload forms set a strict file-size limit in kilobytes. This tool compresses your image toward a kilobyte target you choose, anywhere from 1 KB up to 10,000 KB. It searches encoder quality and, if needed, reduces dimensions to get under your target, then reports the actual size of the file it produced.

Sizes on this site use the convention that 1 KB equals 1000 bytes, and that same convention is used both for the number shown on screen and for deciding whether a target was met. If a target is too small to reach without destroying the image, the tool says the target was not met and shows you the smallest result it could make rather than claiming a false success.

FAQ

Does compressing reduce quality?: Compressing to a smaller file usually reduces quality, because fitting an image into fewer bytes means discarding some detail. The tool aims to keep as much quality as it can while meeting your target, and it always shows the actual size of the result so you can judge the trade-off yourself.
What if my target is too small to reach?: The tool will tell you the target was not met and present the smallest file it managed to produce, keeping your original image untouched so nothing is lost.
Are my images uploaded anywhere?: No. Images are decoded, resized, compressed, and checked inside your own browser. The image bytes, the filename, and the metadata never leave your device, which you can confirm in your browser’s network inspector.
Can I compress an image to MB instead of KB?: Yes. Enter a custom target and change the unit selector to MB. The preset links below cover common KB targets, while the custom field accepts a wider range.
Which formats can I compress?: The compressor can create JPEG, PNG, or WebP output. Choose the format that fits your needs for file size, image quality, and transparency.