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

The SpeechSynthesisUtterance interface of the Web Speech API represents a speech request. It contains the content the speech service should read and information about how to read it (e.g. language, pitch and volume.)

Constructor

SpeechSynthesisUtterance.SpeechSynthesisUtterance()
Returns a new SpeechSynthesisUtterance object instance.

Properties

SpeechSynthesisUtterance also inherits properties from its parent interface, EventTarget.

SpeechSynthesisUtterance.lang
Gets and sets the language of the utterance.
SpeechSynthesisUtterance.pitch
Gets and sets the pitch at which the utterance will be spoken at.
SpeechSynthesisUtterance.rate
Gets and sets the speed at which the utterance will be spoken at.
SpeechSynthesisUtterance.text
Gets and sets the text that will be synthesised when the utterance is spoken.
SpeechSynthesisUtterance.voice
Gets and sets the voice that will be used to speak the utterance.
SpeechSynthesisUtterance.volume
Gets and sets the volume that the utterance will be spoken at.

Event handlers

SpeechSynthesisUtterance.onboundary
Fired when the spoken utterance reaches a word or sentence boundary.
SpeechSynthesisUtterance.onend
Fired when the utterance has finished being spoken.
SpeechSynthesisUtterance.onerror
Fired when an error occurs that prevents the utterance from being succesfully spoken.
SpeechSynthesisUtterance.onmark
Fired when the spoken utterance reaches a named SSML "mark" tag.
SpeechSynthesisUtterance.onpause
Fired when the utterance is paused part way through.
SpeechSynthesisUtterance.onresume
Fired when a paused utterance is resumed.
SpeechSynthesisUtterance.onstart
Fired when the utterance has begun to be spoken.

Examples

In our basic Speech synthesiser demo, we first grab a reference to the SpeechSynthesis controller using window.speechSynthesis. After defining some necessary variables, we retrieve a list of the voices available using SpeechSynthesis.getVoices() and populate a select menu with them so the user can choose what voice they want.

Inside the inputForm.onsubmit handler, we stop the form submitting with preventDefault(),  use the constructor to create a new utterance instance containing the text from the text <input>, set the utterance's voice to the voice selected in the <select> element, and start the utterance speaking via the SpeechSynthesis.speak() method.

var synth = window.speechSynthesis;

var inputForm = document.querySelector('form');
var inputTxt = document.querySelector('input');
var voiceSelect = document.querySelector('select');

var voices = synth.getVoices();

for(i = 0; i < voices.length ; i++) {
  var option = document.createElement('option');
  option.textContent = voices[i].name + ' (' + voices[i].lang + ')';
  option.setAttribute('data-lang', voices[i].lang);
  option.setAttribute('data-name', voices[i].name);
  voiceSelect.appendChild(option);
}

inputForm.onsubmit = function(event) {
  event.preventDefault();

  var utterThis = new SpeechSynthesisUtterance(inputTxt.value);
  var selectedOption = voiceSelect.selectedOptions[0].getAttribute('data-name');
  for(i = 0; i < voices.length ; i++) {
    if(voices[i].name === selectedOption) {
      utterThis.voice = voices[i];
    }
  }
  synth.speak(utterThis);
  inputTxt.blur();
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'SpeechSynthesisUtterance' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
SpeechSynthesisUtterance() constructor
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
lang
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onboundary
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onend
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onerror
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onmark
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onpause
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onresume
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
onstart
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
pitch
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
rate
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
text
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
voice
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?
volume
Experimental
Chrome Full support 33Edge Full support YesFirefox Full support 49IE No support NoOpera Full support 21Safari Full support 7WebView Android Full support 4.4.3Chrome Android Full support 33Edge Mobile Full support YesFirefox Android Full support 62
Full support 62
No support 61 — 62
Disabled
Disabled From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 7.1Samsung Internet Android ?

Legend

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

See also

Document Tags and Contributors

المساهمون في هذه الصفحة: fscholz, MaulingMonkey, abbycar, chrisdavidmills
آخر مَن حدّثها: fscholz,