Chrome Just Downloaded a 4GB AI Model? Here's How to Delete It

Running out of storage and wondering why Chrome suddenly needs gigabytes of space?

Google Chrome’s latest AI-powered features may have automatically downloaded a large AI model to your device. This guide explains what’s happening behind the scenes and the steps to delete the files if you don’t need them.

Here’s a crisp, article-friendly 3-paragraph rephrased summary:

Google Chrome users may be surprised to find an extra 4GB of storage suddenly occupied on their devices. The reason? Google has begun rolling out new AI-powered features that rely on a locally stored AI model.

Known as Gemini Nano, the lightweight AI model runs directly on a user’s computer rather than sending every request to cloud servers. This helps deliver faster responses, improved privacy, and offline AI capabilities.

While the feature offers clear benefits, the large download has caught many users off guard. If you’re short on storage or don’t use Chrome’s AI tools, you may want to check whether Gemini Nano is installed and remove it to reclaim space.

Chrome’s Hidden 4GB AI Download

Google’s Gemini Nano powers several AI features in Chrome, including text assistance, content summarization, and scam detection.

Unlike cloud-based AI tools, Gemini Nano runs directly on your device, allowing certain tasks to be processed locally.

Google says this approach improves performance, reduces internet dependency, and enhances privacy for supported features.

However, the silent download has raised concerns among privacy advocates, as many users may not realize the AI model—stored as a file called weights.bin —can consume around 4GB of storage space.

Google says Gemini Nano is installed only on devices that meet specific hardware requirements. The company also notes that the model may be automatically removed if a device lacks sufficient storage, memory, processing power, or network resources.

Additionally, Google has introduced settings that allow users to disable on-device AI features.

How To Check If Gemini Nano Is Installed On Mac

Open Finder on your Mac.
Navigate to Library > Application Support > Google > Chrome > Default.
Look for a folder named OptGuideOnDeviceModel.
Open the folder and check for a file called weights.bin.
If the weights.bin file is present, Gemini Nano is installed on your device.

How To Check If Gemini Nano Is Installed On Windows

Press Windows + R to open the Run dialog box.
Type %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel and press Enter.
Check the folder for a file named weights.bin.
If the file is present, Gemini Nano is installed on your device.

Alternative Method

Open File Explorer.
Navigate to Local AppData > Google > Chrome > User Data > OptGuideOnDeviceModel.
Look for the weights.bin file to confirm whether Gemini Nano is installed.

How To Disable Gemini Nano On Mac

Open Google Chrome.
Click Settings.
Go to System.
Find the On-device AI option.
Toggle it Off to disable Gemini Nano and its local AI features.

How To Disable Gemini Nano On Windows

Open Google Chrome.
Go to Settings > System.
Turn Off the On-device AI option.
Type chrome://flags in the address bar and press Enter.
Search for Optimisation Guide.
Change “Enables Optimisation Guide on Device” to Disabled.
Fully restart Chrome to apply the changes.
Open the Chrome user data folder.
Locate the OptGuideOnDeviceModel directory.
Delete the folder to remove the Gemini Nano files from your device.

Although Gemini Nano is designed to power Chrome’s AI features, its unexpected installation has raised concerns among some users.

The incident has reignited debates about transparency, with critics arguing that users should be clearly informed when large AI models are downloaded to their devices.

It also highlights the growing demand for greater user control over AI features, storage usage, and software installed automatically by tech companies.

Chrome’s Gemini Nano adds powerful on-device AI features but may quietly use up about 4GB of storage. While it offers benefits like speed and privacy, users can still check, disable, or remove it if needed.

Is Chrome’s 4GB Gemini Nano AI model a useful upgrade—or an unwanted use of your storage space?