Quick guide
Resize an image to a target KB size
- Choose an image.
- Select 20 KB, 50 KB, 100 KB, or enter a custom target.
- Choose the output format and select Resize to target KB.
- Compare the output size with your target and download the result.
How the target-size search works
The browser creates several candidate files at different quality levels. It keeps the candidate closest to the requested byte size. If quality changes cannot get close enough, it repeats the search at smaller dimensions.
Because JPEG and WebP encoders work from image content rather than arbitrary padding, the output may be a few percent above or below the target.
One tool for many file-size requirements
Application forms, profile photos, learning portals, and document systems often specify different limits. A single dynamic calculator provides distinct presets without creating separate thin tools for every number.
For a “maximum 100 KB” rule, use the Reduce Image Size in KB tool instead. This page is designed to get close to a specific target.