Are my images uploaded to a server?

No. The conversion runs entirely in your browser using the HTML canvas API. Your images never leave your device.

How accurate is the conversion?

WebP is re-encoded from the decoded JPG, so it reproduces the source faithfully. At the same visual quality WebP files are typically 25–35% smaller than JPG; very low quality settings can introduce visible artefacts.

Why does my browser say it can't encode WebP?

A few older browsers cannot write WebP from the canvas. If you see that message, use an up-to-date Chrome, Edge, Firefox or Safari — the tool detects this and tells you instead of producing a wrong file.

Is WebP supported everywhere now?

Yes for display — all current browsers (Chrome, Edge, Firefox, Safari 14+) show WebP. The main gaps are some older software and a few email clients, so keep a JPG copy if you need maximum compatibility.

What quality should I choose?

The slider runs 10%–100% (default 85%). Around 80–85% gives the best size-to-quality trade-off for web photos. Go higher only when detail is critical; very low values can blur fine texture.

Will converting to WebP improve my page speed?

Usually yes — smaller image bytes mean faster loads and better Core Web Vitals (LCP). The tool reports the exact percentage saved per file so you can see the gain.

Can I convert several JPGs at once?

Yes. Drop multiple files and they are all converted at the same quality, each showing its size saving and a download button.

JPG to WebP Converter

Convert JPG to WebP in your browser

This tool converts JPG/JPEG photos to WebP entirely in your browser, with a quality slider and a live before/after size readout. WebP delivers the same visual quality as JPG at a noticeably smaller file size, which makes web pages load faster and improves Core Web Vitals — useful for developers, bloggers and anyone optimising images for the web.

How it works

Each JPG is decoded, drawn onto an HTML <canvas> at native resolution, and re-encoded with canvas.toBlob("image/webp", quality). The tool checks the returned blob is actually image/webp — if the browser can’t encode WebP it shows a clear message rather than handing you a wrong file. For every image it reports the original size, the WebP size and the percentage saved.

Example

A 1.4 MB hero.jpg at the default 85% quality typically becomes a ~0.9 MB hero.webp — about a −35% saving — with no visible difference at page size. Across a gallery of a dozen images that can shave megabytes off a page load.

WebP quality	Look	Typical saving vs JPG
90%	Visually identical	~20–25%
85% (default)	Imperceptible loss	~25–35%
70%	Slight softening	~40%+

Everything happens locally — your images are never uploaded, stored, or seen by anyone.