NBC and Fox are set to launch an advertising-supported online video site that hosts programming from varied entertainment companies in a bid to seize viewers from Google Inc.’s YouTube, the broadcasters said.

A test version of the site, Hulu.com, goes online Monday, with plans to premiere a final version in a few months, company officials said.

The site, developed by News Corp. and NBC Universal, a unit of General Electric Co., offers free viewing of full-length films and TV episodes, supported by advertising.

It will host programming from the two networks, as well as TV shows and films from Sony Corp. and Metro-Goldwyn-Mayer Inc.

“Consumers identify with shows and films,” rather than networks, Hulu chief executive Jason Kilar said. “When you aggregate great content together, it makes things easier for the user.”