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Web Audio Library with HTML5 audio fallback.

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Waud is a simple and powerful web audio library that allows you to go beyond HTML5's <audio> tag and easily take advantage of Web Audio API. It abstracts Web Audio API making it consistent and reliable across multiple platforms and browsers. It also falls back to HTML5 Audio on non-modern browsers where Web Audio API is not supported.


  • Base64 Pack
  • Audio Sprites
  • iOS Audio Unlock1
  • Auto Mute2
  • Simple API
  • Zero Dependencies

1 Automatically unlocks audio on iOS devices on first touch.

2 Automatically mutes audio when the window is not in focus (switching tab, minimising window, etc).


Available via npm, cdn and haxelib (for haxe users).




var snd = new WaudSound("assets/loop.mp3", { autoplay: false, loop: true, volume: 0.5, onload: playBgSound });

Base64 Data URI

Waud supports base64 decoding across all browsers including IE 9 and I recommend using this over audio sprites.

Use waudbase64 to generate base64 encoded JSON file.

npm install -g waudbase64

var base64pack = new WaudBase64Pack("assets/sounds.json", _onLoad);

function _onLoad(snds) {

Waud also supports passing data URI string to WaudSound.

//Note that the data URI used below is a sample string and not a valid sound
var base64Snd = new WaudSound("data:audio/mpeg;base64,//uQxAAAAAAAAAAAAASW5mbwAAAA8AAABEAABwpgADBwsLDxISF");

Audio Sprite

Use waudsprite to generate audio sprite.

npm install -g waudsprite

var audSprite = new WaudSound("assets/sprite.json");"glass");

Live Audio Stream

Waud Radio

Waud supports live audio streams, but make sure to disable web audio as live streams can only be played through HTML5 Audio.

var snd = new WaudSound("", { autoplay:true, webaudio:false });

Browser Support

Tested on all major browsers.

Safari Chrome Firefox Edge IE Opera
Latest ✓ Latest ✓ Latest ✓ Latest ✓ 9-11 ✓ Latest ✓

Browser & Device Testing provided by:



Found any bug? Please create a new issue.



// Initialize Waud. Make sure to call this before loading sounds.

// To automatically unlock audio on iOS devices by playing a blank sound.
// The parameter is a callback function that can be used to start playing sounds like background music.

// Use if you want to mute audio when the window is not in focus like switching tabs, minimising window, 
// etc in desktop and pressing home button, getting a call, etc on devices.

// Load and play looping background sound with autoPlay and loop set to true.
// Note that this will not play automatically on iOS devices without touching the screen.
var bgSnd = new WaudSound("loop.mp3", {
    "autoplay": true,
    "loop": true

// Touch unlock callback for iOS devices to start playing bgSnd if it's not already playing
function touchUnlock() {
    if (!bgSnd.isPlaying());

Sample Rate

  • It is recommended to use same sample rate for all the audio files. Playing different sample rate files can cause issues on some devices.
  • By default, Waud uses 44100 sample rate. If your audio files have a different sample rate then specify it using Waud.preferredSampleRate property.

Licensing Information

MIT license

This content is released under the MIT License.

Contributor Code of Conduct

Code of Conduct is adapted from Contributor Covenant, version 1.4