Report: Chrome’s on-device Gemini Nano model can use about 4GB of storage

Google Chrome may use more local storage than some users expect when certain built-in AI features are enabled, according to a report by sources.

sources reported that Chrome can automatically download a large on-device model file — around 4GB in some cases — tied to Google’s Gemini Nano. The file, called weights.bin, is stored inside Chrome’s system folders and helps power features such as scam detection and writing assistance.

Because Gemini Nano is designed to run locally, it relies on model parameters stored on the device rather than a cloud-based model. That approach can offer privacy benefits, but it may surprise users who are low on storage, particularly if size requirements are not clearly disclosed when enabling the features.

How to check whether the file is on your device Users can look for the weights.bin file by opening Chrome’s data folders and checking the OptGuideOnDeviceModel directory.

How to prevent the file from returning Deleting the file alone may not be enough. If Chrome’s AI features remain enabled, Chrome can re-download the model.

To reclaim space and prevent re-downloading, users need to disable the “On-Device AI” option in Chrome under Settings > System.

Google notes that Gemini Nano’s exact size may vary as Chrome updates the model, sources reported.