Reduce Image to Exact KB
Need a photo under 500KB for a form? 200KB for an email? Type the number, done.
Drop your image here
JPG, PNG, WebP. Output will be JPEG (PNG can't target KB reliably).
How to reduce an image to a specific KB size
Drop your image
Drag in any JPG or PNG. The file loads locally — nothing is sent to a server.
Enter target size in KB
Type the number you need — 100, 200, 500, whatever the form or upload limit requires.
Hit Reduce
The tool uses binary search to find the right quality setting that hits your target size.
Download
Check the file size matches, then save it. The dimensions are untouched.
Why you need a target KB tool, not just a quality slider
Most image compressors give you a quality slider and let you figure out the rest. That works fine when you just want the file to be smaller. But when you have a hard limit — a government form that rejects uploads over 200KB, an email system with a 500KB attachment cap, a job application portal that will not accept anything larger — guessing at quality settings is frustrating.
This tool takes a different approach. You tell it the target size in KB, and it runs a binary search through quality settings until it finds one that gets the file under your limit. Compress, check size, compress more or less, check again. It does all of that automatically.
The result is not always pixel-perfect to your exact number — compression does not work that way — but it gets you within a few percent of the target, which is usually close enough.