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.

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.
Candidate Recommendation Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 38 19.0 (19.0)[1]
(utf-16 is not supported)
No support 25 No support
Available in Web Workers 38 20.0 (20.0)[1] 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)[1] No support No support No support
Available in Web Workers No support 20.0 (20.0)[1] 1.0.1 (20.0)[1] No support No support No support

[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: JorisW, Sebastianz, fscholz, teoli, jscissr, realityking, Rob W, kscarfone, ziyunfei
 Last updated by: JorisW,