JPG to WebP: convert in your browser, keep your files
WebP is the simplest, lowest-risk upgrade for any website serving photographs. At quality 75–80 it is typically 25–34% smaller than the equivalent JPG with no visible quality loss, and every major browser decodes it as of 2026. The only friction used to be the conversion itself: most online converters uploaded your file to a server. This page converts it locally in your browser, then hands you a WebP you can save straight to disk.
How to convert JPG to WebP here
- Open the image converter in a new tab — it arrives with WebP already selected as the output format.
- Drop the JPG (or PNG) into the upload area. The file never leaves your machine — you can confirm by going offline and trying again.
- Choose WebP in the output format dropdown.
- If you want a specific size budget, switch to the compressor instead, tick “compress to an exact file size” and enter your target KB. It uses the same engine.
- Click convert, then save the WebP that appears. The original is untouched.
What you should expect to save
In our 50-photo shootout (full numbers in the format comparison), the median JPG-to-WebP saving on photographs was about 29% at the same perceptual quality. Screenshots and flat-colour graphics saved less — usually 12–15%. If you are running a photography site, expect one-third off your image weight on average. If you are running a documentation site with mostly UI screenshots, expect closer to one-eighth.
What about quality loss?
At quality 80 (the default we recommend), WebP and JPG look indistinguishable to human eyes at 100% zoom on calibrated displays. Both start showing artefacts below quality 60, and even then the artefacts (banding in gradients, ringing around hard edges) are similar between the two encoders. If you have a use case where any loss is unacceptable — archival images, screenshots for documentation — convert to WebP lossless instead. The file will be larger than the lossy version but still smaller than the original PNG.
When WebP is the wrong choice
- Email newsletters. Many email clients still render neither WebP nor PNG-with-alpha correctly. Stick with JPG for email.
- Some social platforms and CMSs. A few upload forms will accept a WebP and then re-encode it server-side, often to JPG anyway. Test one image through your actual publishing pipeline before converting a library.
- Logos that need pixel-exact transparency. Use PNG, or WebP lossless. Lossy WebP can produce faint colour fringes around hard alpha edges.
Frequently asked questions
Will my file be uploaded?
No. The conversion runs inside your browser using the built-in canvas API. You can verify by opening the network tab in developer tools, dropping a file in, and watching the “no image bytes left the page” outcome — or by going offline and trying again.
Is WebP actually smaller than JPG?
Yes, usually. The exact saving depends on the image, but a typical photograph at quality 80 lands somewhere between 25% and 35% smaller. The full methodology and the raw numbers are in the 50-photo format shootout.
Should I keep the original JPG?
Yes. Conversion is non-destructive on SnapTools, but having a JPG fallback is still useful for the platforms that do not support WebP yet (some older email clients, some print services). Keep both, serve WebP to browsers that can use it and JPG to everything else.
What about AVIF?
AVIF compresses further, but the browser's built-in encoder cannot create AVIF files — which is why our converter does not offer it. We have a full comparison of WebP and AVIF in the formats section if you want the trade-offs in detail.