This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use 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 spec changes.

The TextEncoder() constructor returns a newly created TextEncoder object for the encoding specified in parameter.


encoder = new TextEncoder(utfLabel); 


Is a DOMString containing the label of the encoder. Each label is associated with a specific encoding type:
Possible values of utfLabel Encoding
"unicode-1-1-utf-8", "utf-8", "utf8" 'utf-8'
"utf-16be" 'utf-16be'
"utf-16", "utf-16le" 'utf-16le'


  • RangeError is thrown if utfLabel is not one of the supported values.


var textEncoder = new TextEncoder("unicode-1-1-utf-8");


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] Not supported 25 Not supported
Available in Web Workers 38 20.0 (20.0)[1] Not supported 25 Not supported
Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support Not supported 19.0 (19.0)[1] 1.0.1 (19.0)[1] Not supported Not supported Not supported
Available in Web Workers Not supported 20.0 (20.0)[1] 1.0.1 (20.0)[1] Not supported Not supported Not supported

[1] An earlier, and slightly different, version of the specification was implemented in Gecko 18.

Before Gecko 38, an invalid parameter lead to a TypeError exception instead of the standard RangeError.

See also

Document Tags and Contributors

Contributors to this page: Sebastianz, fscholz, teoli, jscissr, realityking, Rob W, kscarfone, ziyunfei
Last updated by: Sebastianz,