It asked the US Federal Trade Commission (FTC) to investigate.
But Google said it used the data only to improve its products and services and not to target adverts - in line with its commitments.
In a complaint filed with the authorities earlier this week, the EFF said Chromebooks supplied to schools as part of its Google Apps for Education (GAFE) project came with a feature designed to synchronise the Chrome browser across devices, which transferred students` data without permission.
It said the data collected included "records of every internet site students visit, every search term they use, the results they click on, videos they look for and watch on YouTube, and their saved passwords".
The group alleged Google used the information "for its own purposes such as improving Google products", as well as to target adverts on GAFE`s non-core apps, such as Chrome and YouTube.
The suite`s core apps are:
- Gmail
- Drive
- Calendar
- Sites
Google said: "There are no ads in these core services, and student data in these services is not used for advertising purposes."
Student privacy
In a blogpost on Wednesday, Google said "personally identifiable" data collected was only "used to power features in Chrome for that person, for example allowing students to access their own browsing data and settings, securely, across devices".
"In addition, our systems compile data aggregated from millions of users of Chrome Sync and, after completely removing information about individual users, we use this data to holistically improve the services we provide.
"For example, if data shows that millions of people are visiting a webpage that is broken, that site would be moved lower in the search results. This is not connected to any specific person nor is it used to analyse student behaviours."
Google denied the EFF`s allegation that the practice was not in line with its commitment to the Student Privacy Pledge, which prohibits it from misusing children`s data.
The pledge was co-written by the Future of Privacy Forum and the Software and Information Industry Association, and Google said both organisations had "criticised EFF`s interpretation of the pledge and their complaint".
More about:
