If you're optimizing images for a website, WebP is the easiest win available: at comparable visual quality it's typically 25–35% smaller than JPG, which translates directly into faster page loads.
This converter runs in your browser with WebP preselected. Compare the size readout against your source and keep whichever wins — occasionally an already heavily compressed JPG won't shrink further, and the tool will show you that honestly.
Loading tool…
This is Convert Image Format preconfigured for this task — open the full tool for every option.
Select one or more images.
Choose the target format; consequences (like losing transparency in JPEG) are shown before converting.
Pick a background color if converting transparency to JPEG.
Convert and download individually or as a ZIP.
Every output is re-decoded to confirm it parses as the target format with the expected dimensions; failures are isolated per file.
For typical photos, expect 25–35% savings at equivalent quality. The tool shows exact before/after byte counts measured from the real output, not an estimate.
All current browsers, chat apps, and most CMSes handle WebP. The stragglers are older desktop software and some strict upload forms — for those, stick with JPG.
Technical guidance for choosing settings and reviewing the result.
There is no quality percentage that makes every image exactly 1 MB or 100 KB. A reliable target-size workflow measures real encodes, preserves the best result under the limit, and tells you when resizing is necessary.
8 min read · Reviewed August 2026