WebAssembly


WebAssembly is a new type of code that can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as C/C++ and Rust with a compilation target so that they can run on the web. It is also designed to run alongside JavaScript, allowing both to work together.

In a Nutshell

WebAssembly has huge implications for the web platform — it provides a way to run code written in multiple languages on the web at near native speed, with client apps running on the web that previously couldn’t have done so.

WebAssembly is designed to complement and run alongside JavaScript — using the WebAssembly JavaScript APIs, you can load WebAssembly modules into a JavaScript app and share functionality between the two. This allows you to take advantage of WebAssembly's performance and power and JavaScript's expressiveness and flexibility in the same apps, even if you don't know how to write WebAssembly code.

And what's even better is that it is being developed as a web standard via the W3C WebAssembly Working Group and Community Group with active participation from all major browser vendors.

Examples

Specifications

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
WebAssemblyChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
CompileErrorChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
GlobalChrome Full support 69Edge No support NoFirefox Full support 62IE No support NoOpera No support NoSafari No support NoWebView Android Full support 69Chrome Android Full support 69Edge Mobile No support NoFirefox Android Full support 62Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support Nonodejs No support No
InstanceChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
LinkErrorChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
MemoryChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
ModuleChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
RuntimeErrorChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
TableChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
compileChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android Full support 44Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
compileStreamingChrome Full support 61Edge Full support 16Firefox Full support 58IE No support NoOpera Full support 47Safari No support NoWebView Android Full support 61Chrome Android Full support 61Edge Mobile No support NoFirefox Android Full support 58Opera Android ? Safari iOS No support NoSamsung Internet Android No support Nonodejs No support No
instantiateChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
instantiateStreamingChrome Full support 61Edge Full support 16Firefox Full support 58IE No support NoOpera Full support 47Safari No support NoWebView Android Full support 61Chrome Android Full support 61Edge Mobile No support NoFirefox Android Full support 58Opera Android ? Safari iOS No support NoSamsung Internet Android No support Nonodejs No support No
validateChrome Full support 57Edge Full support 16Firefox Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes

Disabled

Full support Yes

Disabled

Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52

Notes

Full support 52

Notes

Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0
Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

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