Google rolled out Gemini Nano, a 4 GB on-device AI model, to Chrome browsers that meet minimum hardware requirements. The file named weights.bin downloads silently in the background with no user prompt.
- Google Chrome installs a 4 GB Gemini Nano AI model silently on millions of user computers.
- The download includes a 4 GB weights.bin file that consumes storage without an explicit user opt-out during installation.
- Disabling Google's on-device model flags restores 4 GB of storage but removes local features like automated scam detection.
Chrome downloads a 4 GB file called weights.bin to your computer without asking. The file sits in your browser data folder under OptGuideOnDeviceModel. It powers the Help me write feature, smarter tab suggestions, on-device scam detection, and local page summarization. The download happens automatically if your device meets the hardware requirements. Delete the folder manually and Chrome reinstalls it.
The scale of this deployment is massive. Hundreds of millions of computers receive this file. The data transfer alone generates thousands of tonnes of carbon emissions. Google made this a one-time global push with no opt-out during installation.
You can stop Chrome from downloading and keeping this model. The fix takes two minutes and requires changing two flags in Chrome’s experimental settings.
Disable The On-Device Model Flags
Open Chrome. Type chrome://flags into the address bar and press Enter. This takes you to Chrome’s experimental features page. Do not change any other flags unless you know what they do.
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👉 Submit Your PRUse the search bar at the top of the flags page. Type optimization guide and press Enter. Find the flag called Optimization Guide On-Device Model. Click the dropdown menu next to it and select Disabled.
Return to the search bar. Type prompt api and press Enter. Find the flag called Prompt API. Click the dropdown menu next to it and select Disabled.
Restart Chrome And Delete The Existing File
Click the Relaunch button that appears at the bottom of the flags page. Chrome restarts automatically. Do not skip this step. The flags do not take effect until Chrome relaunches.
After Chrome restarts, delete the existing weights.bin file if it is already downloaded. The folder location depends on your operating system. On Windows, navigate to C:\Users[YourUsername]\AppData\Local\Google\Chrome\User Data\OptGuideOnDeviceModel. On Mac, go to ~/Library/Application Support/Google/Chrome/OptGuideOnDeviceModel. Delete the entire OptGuideOnDeviceModel folder. Chrome will not recreate it after you disabled the flags.
Verify The Model Stops Downloading
Open Chrome and use it normally for a few minutes. Navigate back to the OptGuideOnDeviceModel folder. The folder may still exist but should remain empty or disappear entirely. If weights.bin reappears, reopen chrome://flags and confirm both flags still say Disabled. Some Chrome updates reset flags to default settings.
WARNING: Disabling these flags turns off the Help me write feature, on-device scam detection, and local page summarization. Tab suggestions may become less smart. The 4 GB of storage space returns to your drive.
Troubleshooting
If you cannot find the OptGuideOnDeviceModel folder: The model never downloaded because your device does not meet the minimum hardware requirements. No action needed. If flags reset after a Chrome update: Check chrome://flags every two weeks. Major Chrome versions restore flags to default. If Chrome feels slower after disabling: The on-device AI features are no longer running locally. The browser does not become slower; it simply offloads those tasks to cloud servers instead.
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