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

The speak() method of the SpeechSynthesis interface adds an utterance to the utterance queue; it will be spoken when any other utterances queued before it have been spoken.






A SpeechSynthesisUtterance object.


This snippet is excerpted from our Speech synthesiser demo. When a form containing the text we want to speak is submitted, we (amongst other things) create a new utterance containing this text, then speak it by passing it into speak() as a parameter.

var synth = window.speechSynthesis;


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];


Specification Status Comment
Web Speech API
The definition of 'speak()' 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 [1] (Yes) 49 (49) No support ? 7

[1] There is a known issue in Chrome that stops the SpeechSynthesisUtterance from speaking when used for long speeches (greater than or equal to 15 seconds, or 200-300 and more characters). See Chrome issues: 335907, 369472

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


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