The OfflineAudioContext() constructor—part of the Web Audio API—creates and returns a new OfflineAudioContext object instance, which can then be used to render audio to an AudioBuffer rather than to an audio output device.


var offlineAudioCtx = new OfflineAudioContext(numberOfChannels, length, sampleRate);

var offlineAudioCtx = new OfflineAudioContext(options);


You can specify the parameters for the OfflineAudioContext() constructor as either the same set of parameters as are inputs into the AudioContext.createBuffer() method, or by passing those parameters in an options object. Either way, the individual parameters are the same.

An integer specifying the number of channels the resulting AudioBuffer should have.
An integer specifying the size of the buffer to create for the audio context, in sample-frames, where one sample-frame is a unit that can contain a single sample of audio data for every channel in the audio data. For example, a 512 sample-frame buffer for 8 channels of sound would be 512 * ((sizeof(float32) * 8) * 32) or 524,288 bytes.
The sample-rate of the linear audio data in sample-frames per second. All user agents are required to support a range of 22050kHz to 96000kHz, and may support a wider range than that. The most commonly-used rate is 44100kHz, which is the sample rate used by CD audio.

It is important to note that, whereas you can create a new AudioContext using the new AudioContext() constructor with no arguments, the OfflineAudioContext() constructor requires three arguments, since it needs to create an AudioBuffer. This works in exactly the same way as when you create a new AudioBuffer with the AudioContext.createBuffer() method. For more detail, read Audio buffers: frames, samples and channels from our Basic concepts guide.

Return value

A new OfflineAudioContext object whose associated AudioBuffer is configured as requested.

Like a regular AudioContext, an OfflineAudioContext can be the target of events, therefore it implements the EventTarget interface.


const offlineCtx = new OfflineAudioContext({
  numberOfChannels: 2,
  length: 44100 * 40,
  sampleRate: 44100,
const source = offlineCtx.createBufferSource();
// etc...

For a full working example, see our offline-audio-context-promise Github repo (see the source code too.)


Specification Status Comment
Web Audio API
The definition of 'OfflineAudioContext' in that specification.
Working Draft  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support551 ?53 No42 ?
Parameters accepted as a single object, as well as being passed in individually62 ?57 No49 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support551551 ?53 No42 ?
Parameters accepted as a single object, as well as being passed in individually6262 ?57 No49 No

1. Before Chrome 59, the default values were not supported.

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