Google's Silent AI Installation on Chrome Raises Privacy and Legal Concerns
Google has automatically installed a 4GB artificial intelligence model called Gemini Nano on Chrome browsers without user consent, according to security researcher Alexander Hanff. The rollout occurred between late April and early May 2026 on eligible desktop devices, with no notification, pop-up, or straightforward setting to prevent it. Privacy advocates say the practice may violate European data protection law.
Gemini Nano runs locally on devices rather than in the cloud. It handles tasks like detecting scam calls, writing text messages, summarizing recordings, and analyzing screenshots. Users have no way to know the model is installed unless they actively search for it.
How to Check and Remove the Model
On Mac: Open Finder, navigate to Library > Application Support > Google > Chrome > Default, and look for a folder called OptGuideOnDeviceModel containing a file named weights.bin. To remove it, open Chrome settings, go to System, and toggle off On-device AI.
On Windows: Press Windows key + R, paste %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel, and press Enter to check if the file exists. Alternatively, use File Explorer to navigate to C:\Users\[YourUsername]\AppData\Local\Google\Chrome\User Data\OptGuideOnDeviceModel.
To remove Gemini Nano on Windows, follow these steps:
- Open Chrome and go to Settings > System, then toggle off On-device AI
- Type chrome://flags in the address bar and search for "optimization guide"
- Set "Enables optimization guide on device" to Disabled
- Fully close Chrome using the menu, not just closing windows
- Navigate to AppData\Local\Google\Chrome\User Data and delete the OptGuideOnDeviceModel folder
Google said the model will automatically uninstall if a device lacks sufficient resources like processing power, RAM, storage, or bandwidth. A Google spokesperson told CNET that the company added the ability to disable and remove the model directly in Chrome settings in February.
The Business Case and Legal Questions
Running AI inference on user hardware rather than company servers reduces computational costs. Hanff suggested Google may have skipped asking permission because doing so would impede the rollout.
Hanff raised concerns that the installation violates European Union principles of lawfulness, fairness, and transparency under the General Data Protection Regulation. He also suggested the environmental impact should have triggered disclosure under the Corporate Sustainability Reporting Directive.
"Google has given us every reason not to trust them with a history spanning two decades of global privacy violations at massive scale," Hanff said.
Google did not announce how many users received the installation or provide advance notice of the rollout. The company's support documentation describes on-device generative AI models in Chrome but does not explain the automatic installation approach.
For professionals managing Chrome deployments or concerned about device storage and privacy implications, checking for Gemini Nano's presence and disabling it requires manual intervention across your organization's fleet.
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