A new report from security researcher Alexander Hanff has raised concerns about how Google handles AI features inside Google Chrome. According to the findings, Chrome can automatically download a large AI-related file—up to 4GB in size—without clearly asking users for permission.
The file, called weights.bin, installs part of the Gemini Nano AI model locally on a computer. While Google says the feature is tied to future on-device AI capabilities and security tools, critics argue that the lack of explicit user consent is problematic.
Here’s what the file does, why it appears, and how you can remove or block it from downloading again.
What Is the weights.bin File?
The weights.bin file contains data used by Gemini Nano, Google’s lightweight AI model designed to run directly on devices instead of relying entirely on the cloud.
The idea behind local AI processing is simple:
- Faster AI responses
- Better privacy for some features
- Reduced dependence on internet connections
However, the controversy comes from the way Chrome handles the installation. In some cases, the browser may download gigabytes of AI files in the background without an obvious approval prompt.
How to Delete the AI Model File on Windows
If you want to remove the file manually on Windows, follow these steps carefully:
- Press Windows + R to open the Run dialog
- Paste this path:
%LOCALAPPDATA%\Google\Chrome\User Data - Press Enter
- Search for the file named weights.bin
- Select the file
- Press Shift + Delete to permanently remove it
Using Shift + Delete bypasses the Recycle Bin and deletes the file immediately.
How to Delete the File on macOS
Mac users can remove the file through Finder.
Steps:
- Open Finder
- Navigate to:
~/Library/Application Support/Google/Chrome/OptGuideOnDevice Model/ - Locate weights.bin
- Move it to the Trash or delete it permanently
How to Stop Chrome From Downloading the AI Model Again
Deleting the file alone may not prevent Chrome from reinstalling it later. To stop future downloads, you’ll need to disable certain AI-related features.
1: Disable On-Device AI in Chrome Settings
- Open Chrome
- Click the three-dot menu in the top-right corner
- Go to Settings
- Open the System section
- Look for “On-device AI”
- Disable the option if it appears
Google says this feature may not yet be visible for all users or regions.
2: Disable the Experimental AI Flag
Chrome also includes experimental settings through its hidden Chrome Flags menu.
To disable the AI download system:
- Type the following into Chrome’s address bar:
chrome://flags - Search for:
Optimization Guide On-Device - Change the setting to Disabled
- Restart Chrome
This method is currently one of the most effective ways to stop Chrome from downloading the AI model automatically.
Why Some Computers Don’t Have the File
If you searched your system and couldn’t find weights.bin, there’s no reason to worry.
According to the original research, Chrome appears to install the AI model only on devices considered compatible with on-device AI processing. Google also stated that the browser may automatically remove the files if the computer is low on resources or storage.
Testing on some Windows 10 systems reportedly showed no sign of the file at all.
What Is Google Planning to Use Gemini Nano For?
Although Chrome doesn’t yet fully expose these AI tools to users, Gemini Nano is expected to power future browser features such as:
- AI-assisted writing tools
- Smart summarization
- Context-aware browsing assistance
- Possible integration with the Gemini sidebar and assistant features
In other words, the download may be preparing Chrome for upcoming AI functionality that hasn’t fully launched yet.
Concerns Around AI Transparency
This situation highlights a broader debate in the tech world: how much control users should have over AI features running on their devices.
While local AI can improve performance and privacy in some cases, many users expect:
- Clear consent before large downloads
- Transparent explanations about installed files
- Easy ways to disable unwanted AI features
For now, users who prefer a lighter or more privacy-focused browsing experience can manually remove the file and disable the related settings.
If these changes make you uncomfortable, there are plenty of alternative browsers available that focus on privacy, customisation, or reduced background activity.
As AI becomes increasingly integrated into modern software, transparency and user choice are quickly becoming just as important as the features themselves.
