Convert JPG to WebP
Convert JPG to WebP online, free and 100% in your browser. No upload, no signup. All the work happens on your device, so files can be as large as it can handle.
How to convert an image
- Drop or pick your JPG file, or paste it with Ctrl/⌘+V.
- WebP is already selected as the target; tune the quality slider if you like (default 80).
- Convert, compare the before/after, and save, all on your device.
Why convert to this format?
JPEG is the universal lossy photo format, small and readable everywhere, but with no transparency. WebP is a modern web format that is typically 25-35% smaller than JPG or PNG at the same quality, with transparency.
OptImg runs the same high-quality engines desktop tools use, so you get desktop-grade WebP output at a sensible default (quality 80), adjustable at any time, without ever uploading your image.
Your JPG is decoded, re-encoded to WebP and handed straight back, ready to save, all in an instant on your device: no server sees a single byte, which is why there's no queue and files can be as large as your device can handle.
Frequently asked questions
- Is my JPG uploaded to a server?
- The JPG-to-WebP conversion runs at native speed entirely in your browser: nothing is uploaded, your file never leaves your device, there is no queue, and no size limit beyond your device's memory.
- Will converting JPG to WebP lose quality?
- WebP is lossy, tuned to a visually transparent default (quality 80) that you can raise or lower with the slider. If the conversion can't produce a smaller file than your original, we hand the original back instead.
- Is the JPG to WebP converter free?
- Yes: completely free, with no signup, no watermark and no cap on how many files you convert. There is nothing to install; it runs in your browser.