The bills, the Stop Online Piracy Act in the House and the Protect IP Act in the Senate, are backed by major media companies and are mostly intended to curtail the illegal downloading and streaming of TV shows and movies online. But the tech industry fears that, among other things, they will give media companies too much power to shut down sites that they say are abusing copyrights.

The legislation has jolted technology leaders, venture capitalists and entrepreneurs, who are not accustomed to having their free-wheeling online world come under attack.

One response is Wednesday’s protest, which will direct anyone visiting Google and many other Web sites to pages detailing the tech industry’s opposition to the bills. Wikipedia, run by a nonprofit organization, is going further than most sites by actually taking material offline — no doubt causing panic among countless students who have a paper due.

It said the move was meant to spark greater public opposition to the bills, which could restrict its freedom to publish.

“For the first time, it’s very clear that legislation could have a direct impact on the industry’s ability to do business,” said Jessica Lawrence, the managing director of New York Tech Meetup, a trade organization with 20,000 members that has organized a protest rally in Manhattan on Wednesday. “This has been a wake-up call.”

Tim Wu, a professor at Columbia Law School, said that the technology industry, which has birthed large businesses like Google, Facebook and eBay, is much more powerful than it used to be.

“This is the first real test of the political strength of the Web, and regardless of how things go, they are no longer a pushover,” said Professor Wu, who is the author of “The Master Switch: The Rise and Fall of Information Empires.” He added, “The Web taking a stand against one of the most powerful lobbyers and seeming to get somewhere is definitely a first.”

Under the proposed legislation, if a copyright holder like Warner Brothers discovers that a foreign site is focused on offering illegal copies of songs or movies, it could seek a court order that would require search engines like Google to remove links to the site and require advertising companies to cut off payments to it.

Internet companies fear that because the definitions of terms like “search engine” are so broad in the legislation, Web sites big and small could be responsible for monitoring all material on their pages for potential violations — an expensive and complex challenge.

They say they support current law, which requires Web sites with copyright-infringing content to take it down if copyright holders ask them to, leaving the rest of the site intact. Google, which owns YouTube and other sites, received five million requests to remove content or links last year, and it says it acts in less than six hours if it determines that the request is legitimate.

The major players supporting the legislation, including the United States Chamber of Commerce and the Motion Picture Association of America, say those measures are not enough to protect intellectual property. They emphasize that their primary targets are foreign Web sites that sell counterfeit goods and let people stream and download music and video at no charge — sites that are now largely out of reach of United States law enforcement. And they are fighting against what they characterize as gimmicks and distortions by Internet companies opposed to the bills.

With talk of censorship and loss of Internet freedom, “the current debate has nothing to do with the substance of the bills,” David Hirschmann, who leads the Chamber of Commerce’s initiative on intellectual property, said in an interview. “We will certainly use every tool in our toolbox to make sure members of Congress know what’s in these bills.”

With financial resources that few other groups can match, the chamber is one of Washington’s most powerful lobbying forces and has shown the ability to alter Congressional debate on its own.

Reporting was contributed by Eric Lichtblau, Edward Wyatt and Claire Cain Miller.

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