What is a synonym for fo web?

"Fo web" isn't a standard term in English. It's possible you meant "for web" or "web" itself.

If you meant "for web":

* Online

* Web-based

* Internet

* Digital

* Cyber

* Virtual

If you meant "web":

* World Wide Web

* Internet

* Cyberspace

* Online space

* Network

Please provide more context or clarify your request so I can give you a more accurate synonym.