With communications to the region badly affected by the 7.8 magnitude quake, buildings flattened and more than 750 people dead, it can collate information from emergency responders and allows individuals to post details about relatives missing or found.
Within hours of the disaster hitting Kathmandu and its surrounding area just before noon, 200 names had been uploaded.
The tool has become a regular feature of recent disasters, when reliable information is needed rapidly.
Google engineers first launched Person Finder in response to the 2010 earthquake in Haiti, which killed more than 100,000 people.
But it had been under development for years, part of an open-source effort to solve a problem identified during Hurricane Katrina in 2005. As more and more people turned to the internet for help in searching for missing persons, developers realised that relatives and aid workers were having to sift through dozens of websites to find information.
The service is aimed at getting crucial information about the victims of the calamity, and helping rescue teams find them.
The “I’m looking for someone” feature that helps you discover about your loved one.
While “I have information about someone” button provides the opportunity to submit important information relating to a victim.
The data has been made available to the public and is easily accessible.
Meanwhile, a rescue operation is under way for hundreds of people trapped under the debris as the death toll is feared to rise significantly in view of the thickly populated city.
Metropolitan police spokesperson Dinesh Acharya said, “Our focus is on rescue in the core areas of Kathmandu where the population is concentrated,” adding that “many houses and buildings have collapsed.