How to Remove Google’s Gemini Nano from Your Computer

Want to remove Gemini Nano from your computer? You are not alone. Google Chrome has been silently downloading a 4 GB AI model called Gemini Nano to millions of computers since late 2025. No consent dialog. No notification. No opt-in.

The file is called weights.bin, and it sits in a hidden folder called OptGuideOnDeviceModel inside your Chrome profile. Most people have no idea it is there.

Why This Matters

Storage is only part of the problem. Earlier this year, Palo Alto Networks disclosed CVE-2026-0628, a vulnerability where any Chrome extension with basic permissions could hijack Gemini’s panel and inherit elevated access to your webcam, microphone, local files, and screenshots.

Google patched the specific exploit. But the attack surface stays as long as the model lives on your machine.

For law firms handling sensitive client data, that is not an acceptable risk.

Step 1: Check If the File Exists

Windows

Open File Explorer and paste this path into the address bar:

C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\OptGuideOnDeviceModel\

Note: AppData is hidden by default. Either paste the path directly or enable View > Hidden Items in File Explorer.

Look for a file called weights.bin. It will be approximately 4 GB.

Mac

Open Finder, press Cmd+Shift+G, and paste:

~/Library/Application Support/Google/Chrome/Default/OptGuideOnDeviceModel/

Step 2: Disable the Chrome Flags

Do this before deleting the folder. If you skip this step, Chrome will re-download the model automatically.

1. Type chrome://flags in your Chrome address bar and press Enter.
2. Search for optimization-guide-on-device-model and set the dropdown to Disabled.
3. Search for prompt-api-for-gemini-nano and set the dropdown to Disabled.
4. Click the Relaunch button at the bottom of the page.

Step 3: Check Chrome Settings

1. Go to Chrome Settings (three dots menu > Settings).
2. Click System in the left sidebar.
3. Look for any toggle related to “on-device AI” or “Gemini.”
4. Toggle it OFF.

Step 4: Delete the Folder

Windows

Navigate back to the OptGuideOnDeviceModel folder, select it, and press Shift+Delete to permanently remove it.

Or open PowerShell and run:

rmdir /s /q "%LOCALAPPDATA%\Google\Chrome\User Data\Default\OptGuideOnDeviceModel"

Mac

Open Terminal and run:

rm -rf ~/Library/Application\ Support/Google/Chrome/Default/OptGuideOnDeviceModel/

Step 5: Verify

1. Go back to chrome://flags and confirm both flags still show Disabled.
2. Navigate to the folder path again. It should no longer exist.
3. You recovered approximately 4 GB of storage.

Pro tip: Check back after Chrome updates. Google may re-enable these flags in a future version. Add this to your quarterly IT checklist.

Why Law Firms Should Care

If this is the first time you are hearing about Gemini Nano, that is exactly the problem. Silent downloads, hidden folders, and elevated permissions for AI models are the kind of infrastructure risks that slip through when nobody is watching.

Law firms handle privileged communications, case files, and client data every day. A vulnerability that exposes webcam, microphone, and local file access is not theoretical. It is a liability.

At Lawless Clicks, we monitor digital infrastructure for law firms so these things get caught before they become a problem. If you want a free infrastructure audit for your firm, get in touch or call (817) 320-5179.

Frequently Asked Questions

Will removing Gemini Nano break Chrome? No. Chrome functions normally without the on-device AI model. Disabling the flags simply tells Chrome not to download or use the local model. All standard browsing, extensions, and synced features continue to work.

Can Gemini Nano come back after I delete it? Yes, if you skip Step 2. Chrome flags can reset after major updates. That is why we recommend adding a quarterly check to your IT maintenance calendar. Revisit chrome://flags after each Chrome update to confirm both flags remain disabled.

Does this affect Gemini in the browser sidebar? The browser sidebar version of Gemini uses cloud-based processing, not the local model. Removing the on-device weights file does not affect cloud Gemini features. However, disabling the flags will prevent Chrome from running any AI inference locally on your machine.

How do I know if my firm is exposed? If any workstation in your office runs Chrome with default settings, the model was likely downloaded automatically. Run the file path check from Step 1 on every machine. For firms with more than ten workstations, consider a scripted audit using PowerShell or a remote management tool to scan all user profiles at once.

Sources

• Palo Alto Networks Unit 42: CVE-2026-0628 disclosure
• gHacks, PCWorld, Tom’s Guide, Android Authority: May 2026 coverage
• Google Chrome release notes