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

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

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

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

See also


 このページの貢献者: abbycar, chrisdavidmills
 最終更新者: abbycar,