Block access to a list of URLs

Setting the policy prevents webpages with prohibited URLs from loading. It provides a list of URL patterns that specify forbidden URLs. Leaving the policy unset means no URLs are prohibited in the browser. Format the URL pattern according to this format ( ). Up to 1,000 exceptions can be defined in URLAllowlist.

From Google Chrome version 73, you can block javascript://* URLs. However, it affects only JavaScript entered in the address bar (or, for example, bookmarklets). In-page JavaScript URLs with dynamically loaded data aren't subject to this policy. For example, if you block, then can still load using XMLHTTPRequest.

From Google Chrome version 92, this policy is also supported in the headless mode.

Note: Blocking internal chrome://* URLs can lead to unexpected errors.

Example value:

Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

Block access to a list of URLs

Registry PathSoftware\Policies\Google\ChromeOS\URLBlocklist
Value Name{number}
Value TypeREG_SZ
Default Value


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