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

The volume property of the SpeechSynthesisUtterance interface gets and sets the volume that the utterance will be spoken at.

If not set, the default value 1 will be used.


var myVolume = speechSynthesisUtteranceInstance.volume;
speechSynthesisUtteranceInstance.volume = 0.5;


A float that represents the volume value, between 0 (lowest) and 1 (highest.)

If SSML is used, this value will be overridden by prosody tags in the markup.


var synth = window.speechSynthesis;

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

var voices = synth.getVoices();


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.volume = 0.5;


Specification Status Comment
Web Speech API
The definition of 'volume' 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

Document Tags and Contributors

 Contributors to this page: abbycar, chrisdavidmills
 Last updated by: abbycar,