Chrome’s On-Device AI Models: How to Disable and Remove Them

Chrome may download generative AI model files in the background on eligible computers so supported browser features are ready to run locally. This is documented behavior, not evidence of malware, but the download can consume meaningful storage and does not require a separate model-installer prompt.

The supported way to remove the files is simple: open Chrome > Settings > System and turn On-device AI off. Chrome then deletes its on-device generative AI model files and prevents them from being downloaded again while the setting remains off. Manually finding model folders, deleting a weights.bin file, or changing experimental flags is not recommended.

What Chrome’s on-device AI model does

An on-device model performs supported AI processing on the computer instead of sending every inference request to a cloud model. Chrome says these models may help power features such as:

• writing or rephrasing text;
• warning about scams;
• summarizing web pages; and
• organizing tabs.

Local processing can improve latency and privacy for the model operation, but it does not mean every Chrome AI feature is completely offline or sends no data. Each feature can have separate account, telemetry, feedback, or data-use behavior. Read the feature’s privacy notice before entering personal, financial, medical, workplace, or other sensitive information.

Is this the same as Gemini or AI Mode in Chrome?

No. Chrome contains several AI experiences, and not all of them rely on the downloadable on-device generative model. AI Mode in Chrome is connected to Google Search and account activity; Gemini in Chrome can also use hosted services and has its own availability and data controls.

Google explicitly notes that some AI features may continue to work after On-device AI is turned off. Disabling the model setting is therefore not a universal “disable all AI in Chrome” switch.

Why the model can appear without a separate prompt

Google says Chrome may download on-device models in the background so dependent features are ready. A computer must be eligible, with a suitable unmetered connection, enough free disk space, and sufficient performance. The current help page lists approximately 20GB of free disk space as a download requirement; that is not the model’s file size.

A fixed claim that “Gemini Nano always occupies 4GB” is unreliable. Model packaging and versions can change, and Chrome’s official guidance does not promise one permanent size. Check the storage actually used on the computer rather than relying on an old estimate.

How to check whether on-device AI is enabled

Use Chrome’s supported setting on both Windows and macOS:

1. Open Chrome.
2. Select the three-dot More menu.
3. Open Settings.
4. Select System.
5. Find On-device AI and check whether it is on or off.

The setting applies per user and per device. Two Chrome users on the same computer can have different choices, and changing it on one computer does not necessarily change another.

If the setting does not appear

The model and setting are not available on every device. Possible reasons include unsupported hardware, insufficient resources, a staged rollout, an older Chrome version, account eligibility, or an enterprise policy. Update Chrome and restart it, then check again. On a managed work or school browser, ask the administrator instead of changing flags.

How to disable and remove the model

The same steps apply on Windows and macOS:

1. Open Chrome > Settings > System.
2. Turn On-device AI off.
3. Allow Chrome time to remove the stored model files.
4. Restart Chrome if the storage figure or a dependent feature has not updated yet.

According to the official Chrome Help page for on-device models, turning the setting off:

• deletes the on-device generative AI model files;
• stops features that require those models; and
• prevents Chrome from downloading the models again while the setting remains off.

You do not need to disable Optimization Guide in chrome://flags. Flags are experimental, can disappear or change meaning, and may affect unrelated optimizations.

Why manual folder deletion is a bad method

Older instructions point users to profile folders such as OptGuideOnDeviceModel and tell them to delete a model file. That approach has several problems:

• profile locations and component names can change;
• a folder may belong to a different Chrome profile or browser channel;
• Chrome may download the component again if the supported setting remains on;
• partial deletion can leave confusing state or break a dependent feature; and
• a corporate policy may restore the model regardless of a manual file change.

Google states that the On-device AI toggle is the only supported management method. Use it instead of File Explorer, Finder, Terminal, Registry edits, or experimental flags.

What happens if you turn it back on?

Chrome can download the required model again when the device meets the eligibility and download conditions. The transfer may wait for an unmetered connection or sufficient free space. Re-enabling the setting does not guarantee that every feature becomes available; features can have separate language, country, account, hardware, or rollout requirements.

Should you remove the model?

Keep it on if you use supported local AI features, have enough storage, and accept the feature-specific data terms. Turn it off if you need the space, do not use those features, want to minimize background model downloads, or must follow an organizational policy that prohibits them.

Do not expect a large speed or battery improvement on every computer. A stored model consumes disk space, while CPU, GPU, memory, and battery use primarily occur when a dependent feature actually runs.

Privacy checklist

• Distinguish an on-device model from AI Mode, Gemini in Chrome, and cloud search.
• Read the notice for the exact feature, not only the general on-device setting.
• Avoid sensitive information in experimental writing or browsing features.
• Review Google account activity and Chrome sync separately; deleting local model files does not erase account history.
• On a managed device, follow the administrator’s Chrome Enterprise policy.

Chrome’s background model download is a resource and consent concern worth understanding, but the safe remedy is built into the browser. Check Settings > System > On-device AI, turn it off if you do not want the local models, and avoid unsupported manual deletion instructions.