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Exact-KB compressor
Choose a maximum size or target range. The compressor will search for the best available quality without exceeding your limit.
Runs in your browser — the file never leaves your device
Drop an image here
or tap to choose JPG, PNG or WebP up to 25 MB
Choose imageYour before and after preview will appear here
Standard processing stays in this browser.
Report a rejected fileMost compressors give you a quality slider and leave you guessing at the resulting file size. This one works backwards from the number your form demands: you enter the KB limit, and it searches for the highest quality that still fits underneath. That matters when a portal rejects anything over its cap, because a single upload attempt is often all you get before the session times out.
What this fixes
Step by step
Type the maximum size, and a minimum too if the form gives a range like 20 KB to 50 KB.
The compressor searches for the sharpest quality that still fits your limit, scaling the image down only when it has to.
Check the result size in the preview, then download the sensibly named file — free and unwatermarked.
Common questions
The questions people actually ask about this tool — file sizes, formats and what a form will accept.
Still stuck? Contact usA maximum only sets an upper bound, so a 50 KB maximum accepts anything below 50 KB. An exact range keeps the result between a lower and an upper bound — use it when a form says something like 20 KB to 50 KB and rejects files that are too small as well as too large.
No. Compression changes how much data is used to store the picture, not how many pixels wide and tall it is. If your form also states dimensions, use the photo resizer for those and compress afterwards.
JPEG is usually smallest for photographs. PNG suits flat images such as a signature on white, and WebP is often smaller than both but is not accepted by every portal. If a form names a format, use that one even if another would be smaller.
No. The compressor is free to use with no daily cap, no watermark and no account — compress as many images as you need.