Chrome’s AI features may be hogging 4GB of your computer storage

Google Chrome is quietly installing a 4GB AI model file (weights.bin) into your browser directory when certain on-device AI features are enabled. This file belongs to Google's Gemini Nano model, which powers tools like scam detection, writing assistance, autofill, and suggestions by running locally on your machine for privacy benefits. However, the file size—roughly the equivalent of a full Blu-ray movie—is not clearly disclosed when users enable these features, leading to unexpected storage drain. Users can check if the file exists by navigating to Chrome's data folders and looking for the OptGuideOnDeviceModel directory.

Unfortunately, simply deleting the file won't fix the problem because Chrome will re-download it if AI features remain enabled. The only reliable solution is to go to Chrome Settings > System and toggle off the "On-Device AI" option. Google does note that the model size may vary across updates, but this information is buried in a lengthy guide rather than shown at the point of enabling the feature. For professionals who rely on Chrome and value their disk space, this is a silent 4GB tax that deserves more transparency. Consider disabling AI features if storage is tight, or push Google to offer cloud-based alternatives.