Summarizer: create() static method

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.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The create() static method of the Summarizer interface creates a new Summarizer instance from which to generate summaries.

Note: The create() method requires transient activation, that is, it must be invoked in response to a user action such as a mouse click or button press.

Syntax

Summarizer.create()
Summarizer.create(options)

Parameters

options Optional

An object specifying configuration options for the Summarizer. Possible values include:

expectedInputLanguages: An array of strings specifying the expected languages of the input text, which should be valid BCP 47 language tags. Defaults to ["en"].
expectedContextLanguages: An array of strings specifying the expected languages of any provided context strings (either the sharedContext passed to the Summarizer, or a context specified during a summarize() or summarizeStreaming() call), which should be valid BCP 47 language tags. Defaults to ["en"].
format: An enumerated value specifying the text format you want summaries returned in. Defaults to markdown.
length: An enumerated value specifying the relative length for the generated summaries. Defaults to short.
monitor: A callback function with a CreateMonitor argument that enables monitoring download progress of the AI model.
outputLanguage: A string specifying the expected language of summaries generated by the Summarizer, which should be a valid BCP 47 language tag. Defaults to en.
sharedContext: A sharedContext string describing the context the pieces of text to summarize are being used in, which helps the Summarizer generate more suitable summaries.
signal: An AbortSignal object instance, which allows the create() operation to be aborted via the associated AbortController.
type: An enumerated value specifying the type of summary you want this Summarizer to generate. Defaults to key-points.

Return value

A Promise that fulfills with a Summarizer object instance.

Exceptions

NotAllowedError DOMException: Thrown if usage of the Summarizer API is blocked by a summarizer Permissions-Policy.
NotSupportedError DOMException: Thrown if any of the language tags specified in expectedContextLanguages, expectedInputLanguages, or outputLanguage are invalid, or not supported.
OperationError DOMException: General-purpose exception thrown if Summarizer creation failed for any other reason.

Examples

Basic `Summarizer` creation

const summarizer = await Summarizer.create({
  sharedContext:
    "A general summary to help a user decide if the text is worth reading",
  type: "tldr",
  length: "short",
  format: "markdown",
  expectedInputLanguages: ["en-US"],
  outputLanguage: "en-US",
});

Specifications

Specification
Writing Assistance APIs # dom-summarizer-create

Browser compatibility

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This page was last modified on ⁨Sep 24, 2025⁩ by MDN contributors.

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