This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The SpeechSynthesisVoice interface of the Web Speech API represents a voice that the system supports. Every SpeechSynthesisVoice has its own relative speech service including information about language, name and URI.


SpeechSynthesisVoice.default Read only
A Boolean indicating whether the voice is the default voice for the current app language (true), or not (false.)
SpeechSynthesisVoice.lang Read only
Returns a BCP 47 language tag indicating the language of the voice.
SpeechSynthesisVoice.localService Read only
A Boolean indicating whether the voice is supplied by a local speech synthesizer service (true), or a remote speech synthesizer service (false.)
SpeechSynthesisVoice.name Read only
Returns a human-readable name that represents the voice.
SpeechSynthesisVoice.voiceURI Read only
Returns the type of URI and location of the speech synthesis service for this voice.


The following snippet is excerpted from our Speech synthesiser demo.

function populateVoiceList() {
  voices = synth.getVoices();

  for(i = 0; i < voices.length ; i++) {
    var option = document.createElement('option');
    option.textContent = voices[i].name + ' (' + voices[i].lang + ')';
    if(voices[i].default) {
      option.textContent += ' -- DEFAULT';

    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);

if (speechSynthesis.onvoiceschanged !== undefined) {
  speechSynthesis.onvoiceschanged = populateVoiceList;

inputForm.onsubmit = function(event) {

  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];
  utterThis.pitch = pitch.value;
  utterThis.rate = rate.value;

  utterThis.onpause = function(event) {
    var char = event.utterance.text.charAt(event.charIndex);
    console.log('Speech paused at character ' + event.charIndex + ' of "' +
    event.utterance.text + '", which is "' + char + '".');



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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 33 49 (49) No support ? 7
Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support (Yes) (Yes) No support 2.0 No support No support 7.1

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Experimental Interface Reference speech SpeechSynthesisVoice synthesis Web Speech API