Chrome automatically downloads a 4GB AI model file to users' computers without clear notification

Google Chrome is installing a 4GB weights.bin file connected to Gemini Nano (an on-device AI model) in browser system folders when certain AI features are enabled. The file powers Chrome AI tools including scam detection, writing assistance, autofill, and suggestion features.

Because Gemini Nano is designed to run locally on your device rather than relying on cloud servers, it requires training parameters stored locally — a privacy benefit, but one that consumes significant storage space without explicit user notification at the point of feature activation.

Users cannot simply delete the file to free up space; if AI features remain enabled, Chrome may re-download it. To remove the file and prevent future downloads, users must disable the On-Device AI option in Chrome Settings > System. Google states in its help documentation that 'Gemini Nano's exact size may vary as the browser updates the model,' but this information is not presented when enabling the features.