Compress
Compress image to 100 KB
Compress toward 100 KB and compare formats without uploading your source. The result reports actual dimensions, size and target status.
Drop images here
or click to browse · JPG, PNG, WebP · multiple files supported
Images are processed on your device and never uploaded.
Options & settings
Works in your browser. No account needed.
Frequently asked questions
Why do two pictures at the same dimensions produce different sizes?
Encoders represent image content, not just width and height. A smooth background and a busy scene can require different amounts of data. The same settings cannot promise the same size or appearance for every picture.
Is 100 KB guaranteed for every file?
No. The search makes a bounded number of attempts. A result that is still over the target is labelled as such, and you can still download that best-effort file. Unsupported or very large images may fail because browser memory and format support are limited.
How is the target measured?
This tool uses 1 KB = 1,024 bytes, so 100 KB means 102,400 bytes. Some upload forms use decimal KB or a strict “less than” check. Compare their exact byte limit with the result; a file that meets this target may still exceed a stricter limit.
Does reducing file size preserve the original?
The original file is not modified. The download is a newly encoded image; compression may reduce colors, detail or dimensions. It does not preserve the original EXIF metadata. Check the exported copy before sharing it.
About this tool
A 100 KB target is useful when a particular form or workflow explicitly gives you that budget. It is not a universal web standard. Check whether the destination measures KB as 1,000 or 1,024 bytes and whether it has a separate minimum resolution.
For comparison, process the same original in two accepted formats and inspect the downloads. Look for lost transparency, color changes or softened type as well as the byte count. Select the version that fits the task, not simply the smallest output.
Files are processed in this browser, without uploading the source image to ZumaTools. The site has no daily processing quota, but the memory and time available on your device limit batch size. If processing fails, try fewer files or a smaller source.
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