The service predicts a user's question and modifies the displayed results as more letters are typed in to the hunting box.
The firm described it as "search at the speed of thought".
Previously Google's referred to hunting conditions and did not exhibit results until the "enter" key was strike or the "search" symbol was clicked.
Google Instant goes live in the next week and on mobile gadgets by autumn.
The service will primarily be rolled out in the US, UK, Spain, Germany, France and Russia.
In a demo eventuality hold at San Francisco's Museum of Modern Art, Marissa Mayer, Google's vice-president of hunting products and user experience, typed in "sfm" in to the hunting box to denote the new service.
As she typed, results appeared now for "SF MOMA" - the initial likely hunting result.
In other demo, when the e-mail "w" was entered, a list of links gift the "weather" appeared along with images display the temperature.
"We've obviously presaging what question you are likely to do and we're giving you results for that," mentioned Ms Mayer.
Google estimates that the conventional user spends 9 seconds entering a question and 15 seconds seeking for answers.
The firm says Google Instant could trim between two and 5 seconds off a conventional web search.
"Google is betting all they have that speed is everything," Harry McCracken of technology blog Technologizer.com told the BBC.
"Saving a or two seconds isn't that large of a deal. One of my present thoughts is that we am going to see results we do not wish since until we sort sufficient that it knows what we want, it is going to uncover me links we am not meddlesome in."
Technology sportscaster Robert Scoble mentioned that the new underline would present a actual dare to Microsoft hunting engine Bing, that has been bit by bit chipping divided at Google's lead in the hunting market.
"Playing with it, it dramatically changes the way we do searches. we regard it is a flattering leading jump deliver but this means that Bing becomes far reduction engaging and they now have to step up," mentioned Mr Scoble.
Microsoft currently commands around 11% of the US hunting marketplace compared to Google's 66%, according to investigate firm Comscore.
Bing has steadily increased its marketplace share since launch, nonetheless its expansion has not long ago slowed.
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