Converting JPG to WebP typically saves 25 to 35 percent of the file size at visually identical quality. On a page carrying a dozen photographs, that is the difference between a site that feels instant and one that does not, which is why Google's own performance tooling keeps recommending it.
This converter re-encodes your JPG as WebP entirely in your browser. Nothing is uploaded and nothing is queued.
How to convert JPG to WEBP
- Add your JPG. Drag it onto the box above or click to browse.
- Choose the quality. 82 is the default. WebP holds up better than JPG at the same number, so you can often go lower than you would dare with JPG.
- Download. The WebP file downloads straight away.
Serving WebP without breaking anything
You do not have to choose between WebP and compatibility. The picture element lets the browser decide: list the WebP first as a source, put the JPG in a plain img tag as the fallback, and any browser that cannot read WebP quietly takes the JPG. No scripting, no user-agent sniffing, no risk.
In practice almost nothing takes the fallback any more, so the JPG is insurance rather than a real cost. If your images go through a CMS or an image CDN, it very likely does this already and the conversion is a setting rather than a task.
Why page speed tools keep asking for this
Images are usually the largest thing a web page downloads, often by a wide margin. Shaving 30 percent off every photograph on a page tends to do more for load time than any amount of code optimisation, which is why performance audits flag it before almost anything else.
The reason it is easy advice to give is that the trade is genuinely lopsided: real bytes saved, no visible cost, and one line of markup for the rare browser that needs a fallback.
Frequently asked questions
- Am I compressing an already-compressed image?
- Yes, and it is worth being clear about that. Your JPG already lost detail, and re-encoding to WebP is a second lossy pass on top. In practice the result still looks the same at quality 82 while being meaningfully smaller, but you will never recover what the original JPG discarded. If you still have the untouched original, convert from that instead. Going the other direction, use WebP to JPG.
- Is WebP actually better than JPG?
- For the same visual quality it is smaller, usually by a quarter to a third, and it supports transparency and animation, which JPG cannot. The only thing JPG still wins on is universal acceptance by older software.
- Will everyone be able to open it?
- In a browser, yes; support has been universal for years. Outside a browser it is patchier. Some older photo software and some upload forms still refuse .webp files, so if you are sending the image to a person rather than a website, JPG remains the safer default.
- Does the file leave my device?
- No. Your browser does the decoding and encoding locally. Nothing is transmitted.