Permissions-Policy: summarizer directive

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HTTP Permissions-Policy header summarizer directive controls access to the Summarizer API.

Specifically, where a defined policy blocks Summarizer API usage, any attempts to call the API's methods will fail with a NotAllowedError DOMException.

Syntax

http
Permissions-Policy: summarizer=<allowlist>;
<allowlist>

A list of origins for which permission is granted to use the feature. See Permissions-Policy > Syntax for more details.

Default policy

The default allowlist for summarizer is self.

Specifications

Specification
Writing Assistance APIs
# summarizer-permissions-policy

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
summarizer
Experimental
Chrome – Full support
Chrome 138 (Release date: 2025-06-24)
footnote Full support
Edge – No support
Edge 138 (Release date: 2025-06-26)
disabled
disabled From version 138 users must explicitly set the #edge-llm-summarization-api-for-phi-mini preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 122 (Release date: 2025-09-11)
footnote Full support
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android
footnote No support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.

See also