How to block Microsoft Copilot

How to block Microsoft Copilot on every device

Microsoft Copilot is Microsoft’s consumer AI assistant, available as a website and mobile apps. This page covers the standalone Copilot site and app hosts; Copilot inside Office, Bing, and Edge is not blocked. Below: how to block Microsoft Copilot in the browser, on phones and tablets, on your home or school network, and on managed devices.

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Microsoft Copilot

AI assistants

copilot.microsoft.comBlocked

4 hostnames in the Nullgen catalog

Every entry also covers its subdomains, so the Microsoft Copilot app and API are blocked too.

What Microsoft Copilot connects to

These are the hostnames Microsoft Copilot uses for its website, its apps, and its API. Each entry is matched as a suffix — blocking copilot.microsoft.com also blocks every subdomain of it — so the Microsoft Copilot app cannot slip through on a hostname that is not listed. Shared hosts that other products need are deliberately left out.

Hostnames blocked for Microsoft Copilot
Hostname	Role
copilot.microsoft.com	Main website
copilot.cloud.microsoft	App, API, or content host
m365.cloud.microsoft	App, API, or content host
sydney.bing.com	App, API, or content host

Copilot inside Office, Bing, and Edge is not blocked

Copilot is built into Microsoft 365, Bing, and the Edge sidebar, which share Microsoft’s main websites. This guide blocks the standalone Copilot website and app hosts. Turn off the built-in surfaces with the official Edge and Office policies, or remove the Copilot app with Screen Time or your MDM.

Block Microsoft Copilot in the browser

Free: the Nullgen browser extension

The free extension blocks Microsoft Copilot and every other tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself — no DNS change, no policy — and updates as the catalog grows.

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Managed browsers: block the sites by policy

On a school or company fleet, push the hostnames as a browser policy so Microsoft Copilot is blocked even when someone uninstalls extensions. These snippets use the official Chrome, Edge, and Firefox policy names and the same hosts listed above.

Chrome and Edge — URLBlocklist

{
    "URLBlocklist": [
        "copilot.cloud.microsoft",
        "copilot.microsoft.com",
        "m365.cloud.microsoft",
        "sydney.bing.com"
    ]
}

Firefox — policies.json

{
    "policies": {
        "WebsiteFilter": {
            "Block": [
                "*://copilot.cloud.microsoft/*",
                "*://*.copilot.cloud.microsoft/*",
                "*://copilot.microsoft.com/*",
                "*://*.copilot.microsoft.com/*",
                "*://m365.cloud.microsoft/*",
                "*://*.m365.cloud.microsoft/*",
                "*://sydney.bing.com/*",
                "*://*.sydney.bing.com/*"
            ]
        }
    }
}

Chrome and Edge treat a bare hostname as the host plus every subdomain. Firefox needs both the apex and the wildcard pattern.

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Block the Microsoft Copilot app on phones and tablets

Nullgen mobile app

The Nullgen app blocks Microsoft Copilot and 100+ other AI apps and sites on the whole device with an on-device filter — the app, the website, and the API, on any network, with no DNS server to run. Included with Nullgen Pro.

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Without Nullgen: Screen Time on iPhone and iPad

1Open Settings → Screen Time → Content & Privacy Restrictions and turn restrictions on. This covers Microsoft Copilot in Safari and in apps that use Apple’s web filter.
2Under Web Content, choose Limit Adult Websites — the setting that lets you deny copilot.microsoft.com by name.
3Under Never Allow, add copilot.microsoft.com. Safari and apps that use Apple’s web filter will refuse it.
4To keep the Microsoft Copilot app off the device entirely, delete it and set Installing Apps to Don’t Allow, or use Ask to Buy on a child’s Apple Account.

Without Nullgen: Family Link on Android

1Open Family Link, choose the child, then Controls → Content restrictions → Google Chrome — where Microsoft Copilot can be blocked by site.
2Choose Only allow approved sites, or add copilot.microsoft.com under Blocked sites.
3Under Controls → App limits, block the Microsoft Copilot app, or require approval for new installs from Google Play.

Block Microsoft Copilot on your home or school network

A DNS blocker such as Pi-hole, AdGuard Home, NextDNS, or pfBlockerNG blocks Microsoft Copilot for every device on the network — laptops, phones, consoles, and the Microsoft Copilot app — without installing anything on them. Subscribe to the Microsoft Copilot file from the public blocklist, or paste the rules directly.

Subscribe to the Microsoft Copilot list

Every vendor, one list — on GitHub

AdGuard Home, uBlock Origin, and Brave rules

||copilot.cloud.microsoft^
||copilot.microsoft.com^
||m365.cloud.microsoft^
||sydney.bing.com^

DNS blocking cannot see inside a VPN or a phone on mobile data. For a block that follows the device, use the Nullgen apps or an MDM profile.

Block Microsoft Copilot on managed devices

Schools and companies can block Microsoft Copilot on every managed iPhone, iPad, laptop, and Chromebook from the MDM they already run — Intune, Jamf, Kandji, or Google Workspace — with per-person policies and an approval flow for legitimate use. Nullgen Pro provides the profiles and the dashboard; these guides walk through the setup.

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Questions about blocking Microsoft Copilot

Does the free Nullgen extension block Microsoft Copilot?
Yes. The free extension blocks prompts on Microsoft Copilot and every other AI tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself, so it needs no policy and no DNS change.
Will blocking Microsoft Copilot break other websites?
No. Every hostname on this page belongs to Microsoft Copilot alone. Shared websites that other products depend on are never on the list — which is also why AI features built into those products stay reachable.
Can someone get around a Microsoft Copilot block?
A browser-only block can be bypassed with another browser or the Microsoft Copilot app, and a network block can be bypassed with a VPN or a phone on mobile data. A block on the device itself — the Nullgen apps, Screen Time, or an MDM profile — follows the device wherever it goes.
Does this block the Microsoft Copilot app, not just the website?
A DNS or device-level block does. The app talks to the same hostnames listed above, and every entry covers its subdomains, so the app cannot slip through on a hostname that is not listed. A browser policy or extension only covers the browser.
What happens when Microsoft Copilot adds a new hostname?
The catalog is updated as vendors change, and the Nullgen apps, the extension, and the public blocklist all read from it, so a new hostname reaches every device without anyone editing a list by hand.

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