WebP gives you the same visual quality as JPEG in a smaller file, so it's the natural next step for a performance-focused site. This converter turns your JPEGs into optimised WebP, often 25–35% lighter. Pair it with JPEG optimisation in your build.
WebP as the next link in the optimisation chain
Optimising a JPEG squeezes the format about as far as it goes; switching formats is how you go further. WebP's compression is a generation ahead of JPEG's, so the same photograph at the same perceived quality lands roughly 25-35% lighter. For a performance-focused site that already runs JPEGs through optimisation, adding a WebP conversion step is the obvious next gain — it's the difference between a well-tuned legacy file and a smaller modern one. This converter takes your JPEGs and re-encodes them into optimised WebP, ready to drop into a <picture> element or serve directly to browsers that accept it. The picture looks the same; the byte count doesn't.
Fitting WebP into a build pipeline
WebP shines as a build-time output rather than a one-off conversion. A clean asset flow looks like this:
- Resize the source to its display dimensions with the resizer.
- Optimise a baseline JPEG via JPEG optimisation as a universal fallback.
- Convert the same source to WebP here for browsers that support it.
Serving both lets the browser pick the smaller file it understands, so you get the WebP saving on modern clients without breaking anything older. Each step is scriptable in spirit and one upload here, so wiring it into a repeatable process is straightforward.
When JPEG still earns its place
WebP isn't a universal replacement, and pretending otherwise causes support headaches. JPEG remains the safe choice anywhere outside a modern browser — email clients, older content management systems, third-party tools, and partners who expect a .jpg. The pragmatic stance is to keep an optimised JPEG as the dependable baseline and treat WebP as the lighter delivery layer on top. That's why jpegoptim keeps both the optimiser and this converter side by side: you generate the fallback and the modern format from one source, rather than betting everything on a format some destination might reject.