SpeechRecognition: SpeechRecognition() constructor

Limited availability

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

See full compatibility

The SpeechRecognition() constructor creates a new SpeechRecognition object instance.

Syntax

new SpeechRecognition()

Parameters

None.

Examples

This code is excerpted from our Speech color changer example.

const recognition = new SpeechRecognition();
recognition.lang = "en-US";
recognition.interimResults = false;
recognition.maxAlternatives = 1;

// …

Specifications

Specification
Web Speech API # dom-speechrecognition-speechrecognition

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
`SpeechRecognition()` constructor	Chrome – Full support Chrome 33 (Release date: 2014-02-20) prefix prefix Implemented with the vendor prefix: webkit Chrome – Full support Chrome 139 (Release date: 2025-08-05) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) prefix prefix Implemented with the vendor prefix: webkit Edge – Full support Edge 139 (Release date: 2025-08-07) footnote Full support	Firefox – No support Firefox 142 (Release date: 2025-08-19) prefix , disabled prefix Implemented with the vendor prefix: webkit disabled From version 142 users must explicitly set the `media.webspeech.recognition.enable` preference to `true`. To change preferences in Firefox, visit about:config. Firefox – No support Firefox 142 (Release date: 2025-08-19) disabled disabled From version 142 users must explicitly set the `media.webspeech.recognition.enable` preference to `true`. To change preferences in Firefox, visit about:config.	Opera – No support Opera footnote No support	Safari – Full support Safari 14.1 (Release date: 2021-04-26) prefix prefix Implemented with the vendor prefix: webkit	Chrome Android – Full support Chrome Android 33 (Release date: 2014-02-26) prefix prefix Implemented with the vendor prefix: webkit Chrome Android – Full support Chrome Android 139 (Release date: 2025-08-05) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – No support Opera Android footnote No support	Safari on iOS – Full support Safari on iOS 14.5 (Release date: 2021-04-26) prefix prefix Implemented with the vendor prefix: webkit	Samsung Internet – Full support Samsung Internet 2 (Release date: 2014-10-17) prefix prefix Implemented with the vendor prefix: webkit	WebView Android – Full support WebView Android 37 (Release date: 2014-09-03) prefix prefix Implemented with the vendor prefix: webkit	WebView on iOS – Full support WebView on iOS 14.5 (Release date: 2021-04-26) prefix prefix Implemented with the vendor prefix: webkit

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

Full support: Full support
No support: No support
: User must explicitly enable this feature.
: Requires a vendor prefix or different name for use.
: Has more compatibility info.