Convert JPG to WebP
If you run a website, this is the single cheapest performance improvement available to you. WebP delivers the same visual quality as JPG in roughly 25 to 35 percent fewer bytes, and every browser your visitors are realistically using supports it.
Files are decoded and re-encoded inside this browser tab. Nothing is uploaded — you can disconnect from the internet after this page loads and conversion still works.
Drop in a folder of JPGs and take the batch back as a ZIP. Conversion runs in your browser, so there is no upload wait even for large sets.
How to convert JPG to WebP
- Drag your JPG files onto the box above, or click it to browse.
- Each file converts in place — no upload, no queue.
- Download them one by one, or grab the whole batch as a ZIP.
Why this helps your Core Web Vitals
Images are usually the largest thing on a page, which makes them the usual cause of a poor Largest Contentful Paint score. Cutting image bytes by a third directly improves LCP, and LCP is a ranking signal. For an image-heavy page on a mobile connection, the difference is often the gap between passing and failing.
This matters more than most on-page SEO tinkering, and it takes an afternoon rather than a quarter.
Serve both, do not just replace
The robust way to deploy WebP is to offer it alongside the original rather than instead of it, letting the browser choose. In HTML that means a picture element with a WebP source and a JPG fallback in the img tag. Browsers that understand WebP take it; anything that does not falls back silently.
This also protects you against the non-browser consumers of your images — feed readers, social scrapers, and email clients — some of which still do not handle WebP.
Do not re-convert repeatedly
Both formats are lossy, so each conversion discards a little detail. Converting a JPG to WebP once is fine. Converting a WebP back to JPG and then to WebP again compounds the loss and will eventually show. Keep your original JPGs as the master copies and generate WebP from them.
Frequently asked questions
How much smaller is WebP than JPG?
Typically 25 to 35 percent at matching visual quality. Images with smooth gradients and flat areas benefit most; dense photographic detail benefits least.
Do all browsers support WebP?
Every current browser does, including Safari since version 14 in 2020. Desktop applications are less consistent, which is why serving WebP with a JPG fallback is the safer pattern.
Will this hurt image quality?
Conversion runs at quality 0.92, where WebP artefacts are not visible at normal viewing sizes. Because both formats are lossy, avoid repeated round trips.
Can I convert a whole folder at once?
Yes. Select any number of files and download the results as a single ZIP.
Is anything uploaded to a server?
No. Everything is processed in your browser, which is also why there is no queue and no file size limit beyond your available memory.