You click "Summarize text" on a website. Your text travels to a server somewhere in the world, gets processed, and comes back as a summary. Normal. Until now, anyway.
Opera wants to change that. The browser maker has introduced WebAI: a proposed web standard (a shared rulebook that browsers and websites agree on). It would let pages and extensions use an AI model that runs on your own computer. Not in the cloud.
What is it, exactly?
Currently, WebAI is an early preview in the Opera One browser. The model comes from Google (Gemma, an open language model) or, on a Mac, from Apple (its built-in AI model). Compatible models that already sit on your computer can also be used.
Important: this is a proposal, not a finished standard. Whether other browsers join is still open. Opera names Google and Microsoft as backers. We could not confirm that from a second source.
What websites would do with it sounds unspectacular. Summarize, rewrite, translate, proofread. Exactly the jobs that usually need a cloud service today.
What does it cost?
Currently nothing. Opera One is free, WebAI too, and there is no subscription. The price is different: computing power. Your machine does the work. An older device gets audibly slower, and the fan says hello.
The preview currently runs on 64-bit Windows and on Macs with Apple chips. If you use Linux or an older Intel Mac, you watch for now. (Yes, Linux folks too. You get used to it.)
What about privacy?
The honest answer: better, but not automatically good.
When the model runs on your machine, your texts do not have to leave it for the AI processing. That is a real advantage, especially for things like emails or notes. Opera itself words it carefully: page data can stay on the device.
What a website does with the result is not something WebAI controls. If the site sends the summary to its own server afterwards, the local model helps little. You still have to trust the site. At least: the feature is off by default, and every website has to ask for permission separately.
No reason to panic, no reason to cheer. A sensible building block.
Is it for me?
If you use Windows or an Apple Mac and you are curious: yes, to try out. You need no account, no API key (the access code developers need for cloud AI) and no command line. Switch it on, grant permission, go. Do not expect miracles though: a small model on your laptop does not beat the big cloud models.
For developers the standard is more interesting. Opera lists interfaces (APIs) for summarizing, writing, rewriting, translating and proofreading. A website could offer AI features without paying for servers itself.
If you want to go deeper, Ollama: AI on your own PC shows how to run models yourself. WebAI is the convenient version: less control, zero setup.
My tip: try it once the preview runs for you. Enable it only for sites you already trust. And watch whether Firefox, Chrome and the rest follow. That decides whether the proposal becomes anything.