Convert JPG to WebP — privately

WebP images are usually 25–35% smaller than JPG at the same visual quality, which makes websites load faster. Fizzdoc converts your JPG files right on your device.

Free forever · Runs on your device · 0 bytes uploaded

Choose images or drop them here · never leaves this device

Quality 90%

Slow or not working? Report it on GitHub

How to jPG to WebP

Add one or more JPG images.
Pick a quality, or keep the default.
Click “Convert to WebP” and download.

Also good for

convert JPG to WebP free
make images smaller for a website
JPEG to WebP
WebP converter
bulk JPG to WebP

Private by design — and you can check

Your files are never uploaded, because there is nowhere to upload them to.

No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
Open sourceEvery line is on GitHub, built on qpdf, pdf.js & pdf-lib.

Frequently asked questions

Are my files uploaded anywhere?

No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.

Why convert JPG to WebP?

WebP images are usually 25–35% smaller than JPG at the same visual quality, which makes websites load faster.

Can I convert many images at once?

Yes. Add as many as you like; several images download together as one ZIP file.

Is Fizzdoc free?

Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.