WebP versus JPEG for photographs
JPEG's compression dates from 1992 and has aged remarkably well, but WebP's encoder is thirty years newer. On the same photograph at matched visual quality, WebP files typically come out 25–35% smaller — the single easiest saving available on most image-heavy websites.
The catch is that both are lossy formats, so converting one to the other means encoding already-encoded data. Done at a sensible quality that is invisible; done carelessly it stacks artefacts on top of artefacts.
Why convert JPG to WebP?
- Page speed. Photographs dominate the weight of most pages, and a third off every one of them is a substantial improvement to load time.
- Better ranking signals. Faster image delivery improves Largest Contentful Paint, which feeds directly into Google's page experience signals.
- Lower bandwidth costs. Serving fewer bytes from a CDN or host reduces the bill on high-traffic sites.
- Modern CMS pipelines. WordPress, Shopify and most static site generators now prefer WebP, and many will serve it automatically if you supply it.
- Same picture, less data. At the default quality, side-by-side comparison at normal viewing size shows no visible difference.
How to convert JPG to WebP
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Add your images
Drag one or more JPG files onto the drop area at the top of this page, or press Choose JPG files to pick them from your device. Each file appears in the list with a preview, its original name, pixel dimensions and file size.
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Convert
Press Convert to WebP. Your browser decodes each image, draws it to an HTML5 canvas and re-encodes it. Files are handled one at a time so the page stays responsive.
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Download
Press Download WebP next to any finished image, or Download all as ZIP to grab everything at once. Filenames keep their original stem, with the extension changed.
Avoiding double compression
Because your JPG is already lossy, re-encoding to lossy WebP is a second round of compression. The practical rule: encode WebP at a quality at least as high as the JPEG's, and never chase extra savings by dropping the slider low. 85% is a safe default here; go to 90–95% for images with fine texture, text overlays or hard edges.
Where possible, generate WebP from the original camera file or lossless master rather than from a JPEG. If the JPG is all you have, converting at high quality is still worthwhile — just keep the JPG as your archive copy.
The result is fully opaque, since JPEG carries no transparency to preserve.
Privacy: nothing is uploaded
Most online converters send your file to a server, process it there and hand back a download link. This one does not. The page is a static site with no backend and no upload endpoint — your images are read from disk by the browser, decoded by the browser and re-encoded by the browser. They stay on your device.
A practical consequence: the tool keeps working offline once the page has loaded, and it is safe for images you would not want to hand to a third party. If you would like to verify the claim yourself, open your browser's developer tools, switch to the Network tab and run a conversion — you will see no request carrying your image. Read the full privacy policy for details on advertising cookies.
Frequently asked questions
How do I convert JPG to WebP?
Drop your JPG files onto the area at the top of this page, choose a quality level if you want to, press Convert to WebP, and download the results.
How much smaller is WebP than JPG?
Typically 25–35% smaller at equivalent visual quality, though the exact figure depends on the image. Photographs with smooth gradients benefit most.
Will converting JPG to WebP reduce quality?
Slightly, because it is a second lossy encode. At 85% and above the difference is not visible at normal viewing size. Keep the quality high and keep your JPG originals.
Do all browsers support WebP?
Yes. Chrome, Firefox, Safari 14 and later, Edge and all current mobile browsers display WebP natively.
Should I convert JPG to WebP or AVIF?
AVIF compresses better still, but encodes slowly and has patchier tooling support. WebP is the pragmatic choice for most sites today, and this tool produces it instantly in your browser.
Can I convert lots of photos at once?
Yes. Add as many JPG files as you like, convert them in one pass, and download them together as a ZIP archive.
Are my photos uploaded anywhere?
No. Encoding happens on your own device through your browser's canvas. The site is static, with no backend and no upload endpoint.
Is there a limit on image size?
There is no fixed file-size limit, but conversion is bounded by your device's memory and your browser's maximum canvas size. Images wider or taller than 16,384 pixels may fail — mobile Safari is the strictest here. The tool tells you when an image exceeds what your browser can handle.
Can I use this converter on mobile?
Yes. The page is responsive and works in mobile Chrome, Safari, Firefox and Edge. Very large images may fail on phones because of tighter memory limits.