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 utf-8 TextEncoder object.


encoder = new TextEncoder(); 


  • TextEncoder() takes no parameters since Firefox 48 and Chrome 53

Note: Prior to Firefox 48 and Chrome 53, an encoding type label was accepted as a paramer to the TextEncoder object, since then both browers have removed support for any encoder type other than utf-8, to match the spec. Any type label passed into the TextEncoder constructor will now be ignored and a utf-8 TextEncoder will be created.


  • TextEncoder() throws no exceptions since Firefox 48 and Chrome 53

Note: Prior to Firefox 48 and Chrome 53 an exception would be thrown for an unknown encoding type.


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

 Last updated by: _jordan,