How to compress an image to a specific KB size
- Choose your image — drop it on the box above or click to browse. The file stays on your device.
- Set the target size — use a preset (20 KB, 50 KB, 100 KB, 200 KB, 500 KB) or type the exact limit your form requires.
- Pick an output format — JPG works on virtually every portal; WebP gives smaller files for modern websites; PNG keeps transparency and sharp graphics.
- Compress and check — the tool searches for the best quality under your limit and shows you the actual resulting size before you download.
How the target-size compression works
File size does not shrink in a straight line when you lower quality, so guessing a quality percentage rarely lands under a strict limit. This tool instead tests a series of quality settings automatically and keeps the highest one whose output is at or below your target. If even the lowest useful quality is still too large — common with very large, detailed photos and very small targets — it gradually reduces the pixel dimensions as well and repeats the search. The size shown after compression is the real size of the file you will download, measured from the generated file itself.
Important limitations — stated honestly
- PNG is lossless. There is no quality setting to turn down, so a PNG can only reach a KB target by reducing its dimensions. If you need a much smaller file, JPG or WebP will usually get there with better-looking results.
- Very small targets change the picture. Forcing a large detailed photo under 20 KB may require noticeably smaller dimensions. The result panel always shows the final dimensions so you can judge whether it still suits your purpose.
- JPG does not support transparency. Transparent areas of a PNG are placed on a white background when you choose JPG output.
- Animated images: only the first frame is processed.
- HEIC photos (iPhone): some browsers cannot open HEIC files directly. If your browser cannot read the file, the tool will tell you instead of failing silently.
Privacy
Compression runs 100% locally in your browser using built-in browser technology. Your image is never uploaded to ImageConvertPro or any other server, and nothing about the file is stored or tracked. You can verify this in your browser's developer tools: processing this page makes no network request containing your image.
Frequently asked questions
Is this image compressor really free?
Yes — no sign-up, no watermark and no per-file charge. The site is supported by advertising.
Why does my form reject a photo that is only slightly over the limit?
Most portals apply their limit strictly: a 201 KB file fails a 200 KB rule. That is why this tool targets a size at or below your chosen limit and shows the exact result before you download.
Will compressing to 200 KB ruin my photo's quality?
For typical phone photos and common targets like 100–200 KB, the difference is hard to notice, because the tool keeps the highest quality that fits. Extremely small targets (such as 20 KB) on large photos will look softer — the tool reports the dimensions and quality used so you can decide.
Which format should I choose?
JPG for photos and maximum compatibility with forms and portals; WebP when the destination accepts it and you want the smallest file; PNG for screenshots, logos and graphics where transparency or pixel-sharp edges matter.
Is there a file size limit?
Processing happens on your device, so the practical limit is your device's memory. Very large photos (for example 100+ megapixels) may be slow on older phones.