Chrome and Edge Now Need 20GB of Free Space for AI — Here's What's Really Happening

In early May 2026, privacy researcher Alexander Hanff published a forensic analysis showing that Google Chrome was silently downloading a roughly 4GB AI model — Gemini Nano — onto eligible machines without any notification or consent . The discovery quickly spiraled into a major privacy controversy, drawing scrutiny from EU regulators, rival browser makers, and fact-checkers at Snopes .

By August 2026, Google updated its Chrome support documentation to reveal that the browser requires approximately 20GB of free disk space before it will even begin downloading its on-device generative AI models . Microsoft Edge follows a similar pattern. This article explains what the 20GB figure really means, how much storage the actual models consume, how to opt out as an individual or enterprise admin, and why the practice sparked such a backlash.

The 20GB Requirement Is a Buffer, Not the Model Size

The 20GB figure is a free-space gate, not the size of the AI model itself . Both Chrome and Edge require roughly 20GB of available disk space as a precondition before they will initiate the download of on-device generative AI models (Gemini Nano for Chrome, a comparable foundational model for Edge) .

Google's official support documentation lists approximately 20GB of free disk space, an unmetered network connection, and sufficient device performance as eligibility requirements . The high threshold is a safety buffer to ensure the download, decompression, and temporary staging files have enough room to complete without failures or performance degradation . If a device has less than 20GB free, Chrome simply skips the download entirely .

What the Installed Models Actually Consume

Once downloaded and installed, the actual storage footprint is much smaller:

Source	Post-Installation Size
Google's official confirmation (via Android Authority)	~4 GB
Independent reporting (Ubergizmo, Tom's Hardware)	~4 GB
Individual user observations (weights.bin file)	4.0–4.3 GB
Microsoft Edge (EdgeLLMOnDeviceModel)	~2.3–2.5 GB

Chrome's core model file is named weights.bin and lives inside the OptGuideOnDeviceModel folder within the browser's user data directory . Edge stores its analog under

%LOCALAPPDATA%\Microsoft\Edge\User Data\EdgeLLMOnDeviceModel\

A caveat: Chrome's background updater has been reported to sometimes fail to delete older model versions, which can cause the folder to balloon to 12GB or more on affected systems .

How to Check If the Model Is Installed

You can check the current status and size of Chrome's on-device AI model by opening this URL in Chrome:

This internal page shows model status, version, and storage details . You can also check the file directly in your Chrome user data folder under OptGuideOnDeviceModel .

How to Opt Out: Individual Users

Chrome

Google added an official toggle in Chrome's settings in February 2026 :

1. Go to Settings → System → On-device AI.
2. Turn the toggle off.

Turning this off deletes any downloaded model files and prevents future downloads . Users can also disable related AI feature flags via chrome://flags for more granular control .

Warning: Manually deleting the weights.bin file is ineffective — Chrome will simply re-download it on the next restart .

Edge

Microsoft Edge does not offer a simple user-facing toggle for the local foundational model, but users can disable it through registry settings or policy (see enterprise section below) .

How to Opt Out: Enterprise Administrators

Chrome — Google Admin Console

1. Sign in to the Google Admin Console.
2. Go to Devices → Chrome → Settings → User & browser settings .
3. Scroll to Generative AI and configure the desired settings.

Key enterprise policies:

• DevToolsGenAiSettings policy: Controls AI assistance features in managed Chrome environments. Set to 1 (Allow feature without improving AI models) or 2 (Disable feature) .
• GeminiSettings policy: Set to 1 (Do not allow) to disable all Gemini integrations across the organization .
• GenAILocalFoundationalModelSettings: This policy is shared with Edge (see below) and can be set via registry or Windows Group Policy .

Edge — Windows Registry / Group Policy

Microsoft provides a GenAILocalFoundationalModelSettings policy that works for both Edge and Chrome on Windows :

• Allowed (0) — Model automatically downloads and is used for inference (default).
• Disallowed (1) — Model is not downloaded; any existing model is deleted.

To set via Registry Editor:

For Edge: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge
For Chrome: HKLM\SOFTWARE\Policies\Google\Chrome

Create a DWORD (32-bit) value named GenAILocalFoundationalModelSettings and set it to 1 .

To set via Command Prompt (admin):

# For Chrome
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v "GenAILocalFoundationalModelSettings" /t REG_DWORD /d 1 /f

# For Edge
reg add "HKLM\SOFTWARE\Policies\Microsoft\Edge" /v "GenAILocalFoundationalModelSettings" /t REG_DWORD /d 1 /f

On macOS and Linux, equivalent configuration files apply. See Microsoft's and Google's enterprise documentation for details .

Why the Practice Drew Scrutiny Starting May 2026

Several factors combined to make this one of the most contentious browser privacy stories of 2026:

1. Lack of consent. The download happened automatically in the background on eligible machines without a clear opt-in prompt .

2. Self-reinstalling behavior. Users who deleted the file reported that Chrome re-downloaded it on the next restart, making manual removal futile .

3. Privacy documentation quietly removed. Chrome 148 (May 5, 2026) removed the claim that on-device AI "allows you to use AI models that run directly on your device without sending data to Google servers" — raising concerns about what data might now be sent to Google's servers . Google's spokesperson later told Decrypt that the removal "does not reflect a change in how on-device AI is processed" and that data is still processed locally .

4. W3C standards controversy. Google shipped the Prompt API (a JavaScript interface to Gemini Nano) over formal objections from Mozilla, Apple's WebKit team, the W3C Technical Architecture Group, Microsoft, and even a Chrome engineer who had helped approve the feature .

5. EU legal risk. Alexander Hanff argued that the silent installation may violate the EU's ePrivacy Directive and GDPR .

6. Energy and bandwidth costs. The 4GB download across millions of machines was estimated to waste significant bandwidth and electricity .

Snopes later fact-checked the claims and largely confirmed the core behavior (silent download, self-reinstallation upon deletion), rating the core assertion as "mostly accurate" .

The Bottom Line

The 20GB requirement is a download gate, not a permanent storage tax — the actual Gemini Nano model takes up about 4GB. But for many users, the real issue isn't the disk space: it's the lack of transparency and consent. Whether you're a privacy-conscious individual or an IT administrator managing a fleet of machines, the opt-out methods above give you control over what lands on your SSD.