This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

TextEncoder takes a stream of code points as input and emits a stream of bytes. For a more scalable, non-native library, see StringView – a C-like representation of strings based on typed arrays.

Note: Firefox, Chrome and Opera used to have support for encoding types other than utf-8 (such as utf-16iso-8859-2, koi8, cp1261, and gbk). As of Firefox 48 (ticket), Chrome 54 (ticket) and Opera 41, no other encoding types are available other than utf-8, in order to match the spec. In all cases, passing in an encoding type to the constructor will be ignored and a utf-8 TextEncoder will be created (the TextDecoder still allows for other decoding types). 

Note: There is a polyfill implementation to support all the legacy encodings in GitHub.


The TextEncoder interface doesn't inherit any property.

TextEncoder.encoding Read only
Is a DOMString containing the name of the encoder, that is a string describing the method the TextEncoder will use.


Returns a newly constructed TextEncoder that will generate a byte stream with utf-8 encoding.


The TextEncoder interface doesn't inherit any method.

Returns a Uint8Array containing utf-8 encoded text.


Specification Status Comment
The definition of 'TextEncoder' in that specification.
Living Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 38 19.0 (19.0) [1] No support 25 No support
Available in Web Workers 38 20.0 (20.0) No support 25 No support
Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support No support 19.0 (19.0) [1] 1.0.1 (19.0) No support ? No support
Available in Web Workers No support 20.0 (20.0) 1.0.1 (20.0) No support ? No support

[1] An earlier, and slightly different, version of the specification was implemented in Firefox 18.
[2] As of Firefox 48, Chrome 54 and Opera 41, no other encoding types are allowed other than utf-8. 

See also

Document Tags and Contributors

 Last updated by: chrisdavidmills,