Google Chrome Secretly Installs 4GB AI Model on User Devices Without Consent

As of 2026, Google maintains an iron grip on the web browser market, boasting well over three billion Chrome users worldwide. Even minor changes or interruptions can have a significant impact on such a massive user base.

Security researcher Alexander “The Privacy Guy” Hanff revealed in a recent blog post that Google’s Chrome browser has been silently installing an AI model on users’ devices without explicit consent. Hanff discovered a four-gigabyte file named “weights.bin” in a directory called “OptGuideOnDeviceModel.”

The file contains the learned numerical parameters of an AI model—known as weights—which teach the model how to evaluate the importance of various data points. These parameters belong to Google’s Gemini Nano, an AI model designed to operate locally on users’ devices rather than in the cloud.

Hanff stated in his post:

“Chrome did not ask. Chrome does not surface it. If the user deletes it, Chrome re-downloads it.”

Beyond the lack of transparency, concerns persist about the implications of this installation, including its impact on device performance and storage. The sheer size of the file—4GB—raises questions about efficiency and user experience. Additionally, the absence of public acknowledgment from Google has fueled skepticism.

The company has yet to respond to multiple requests for comment, including from Futurism.

Environmental and Regulatory Concerns

Hanff highlighted the potential environmental impact of this silent installation. He estimated that deploying the AI model across Chrome’s user base could result in between six thousand and sixty thousand tonnes of CO2-equivalent emissions, depending on the number of devices affected.

Furthermore, Hanff argued that Google’s actions may constitute a direct breach of European Union data privacy regulations, including the General Data Protection Regulation (GDPR), which has been in effect since 2018.

User Backlash and Industry Reactions

Internet users have expressed outrage over Google’s lack of transparency and consent. On Reddit, one user wrote:

“AI/Climate aside, my real issue is that Google installs anything without my consent no matter the size. Thankfully I don’t use Chrome; it’s Firefox for me.”

Others speculated that Google may be auto-installing the model to artificially inflate its AI usage statistics. One user commented:

“All of this only so they can show the market that people really are ‘using’ their AI crap.”

Another added:

“AI is so s*** that companies have to force it down people’s throats. They know nobody asked for this.”

A frustrated X (formerly Twitter) user stated:

“There were few things Google could do to force users off of Chrome faster than this.”

How the AI Model is Installed and How to Stop It

According to Hanff’s findings, the download of the weights.bin file is triggered when Chrome’s default AI features are active. He explained:

“On any machine that meets the hardware requirements, Chrome treats the user’s hardware as a delivery target and writes the model.”

To prevent the model from reinstalling after deletion, Hanff advised users to manually disable AI features through the browser’s settings. He described the practice as “the true definition of malware.”

Google’s Chrome is not the only browser facing scrutiny over AI features. However, the scale and secrecy of this installation have amplified concerns among privacy advocates and users alike.