wasmerio/wasmer

🚀 Fast, secure, lightweight containers based on WebAssembly

{
  "createdAt": "2018-10-11T10:15:53Z",
  "defaultBranch": "main",
  "description": "🚀 Fast, secure, lightweight containers based on WebAssembly",
  "fullName": "wasmerio/wasmer",
  "homepage": "https://wasmer.io",
  "language": "Rust",
  "name": "wasmer",
  "pushedAt": "2025-11-27T02:28:58Z",
  "stargazersCount": 20204,
  "topics": [
    "emscripten",
    "linux",
    "macos",
    "rust",
    "wasi",
    "wasix",
    "wasm",
    "wasmer",
    "webassembly",
    "windows"
  ],
  "updatedAt": "2025-11-27T02:29:02Z",
  "url": "https://github.com/wasmerio/wasmer"
}

Wasmer is a blazing fast and secure WebAssembly runtime that enables incredibly lightweight containers to run anywhere: from Desktop to the Cloud, Edge and your browser.

Secure by default. No file, network, or environment access, unless explicitly enabled.
Pluggable. supports WASIX, WASI out of the box.
Incredibly Fast. Run WebAssembly at near-native speeds.
Embeddable anywhere via Wasmer SDKs

Install Wasmer

curl https://get.wasmer.io -sSfL | sh

Other installation options (Powershell, Brew, Cargo, ...)

Wasmer can be installed from various package managers. Choose the one that fits best for your environment:

Powershell (Windows)
Terminal window
```
iwr https://win.wasmer.io -useb | iex
```

Homebrew (macOS, Linux)
Terminal window
```
brew install wasmer
```
Scoop (Windows)
Terminal window
```
scoop install wasmer
```
Chocolatey (Windows)
Terminal window
```
choco install wasmer
```
Cargo binstall
Terminal window
```
cargo binstall wasmer-cli
```
Cargo

Note: All the available features are described in the wasmer-cli crate docs
Terminal window
```
cargo install wasmer-cli
```

Looking for more installation options? See the wasmer-install repository to learn more!

Note: You can also try Wasmer online in wasmer.sh

Quickstart

[!Tip]
As part of our commitment to open source, we want to reward all GitHub users. In addition to the free tier, you can get up to $200 in Wasmer Edge credits for your open-source contributions - Claim here.

You can start by running Cowsay:

$ wasmer run cowsay "hello world"
 _____________
< hello world >
 -------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
               ||----w |
                ||     ||

There are many more available packages, such as wasmer/python or quickjs. Create your own package, or explore packages from the community: https://wasmer.io/explore

Here is what you can do next:

Wasmer SDK

You can use the Wasmer runtime embedded in different languages with the Wasmer SDK:

	Language	Package	Documentation
![Rust logo]	[Rust][Rust integration]	[`wasmer` Rust crate]	[Learn][rust docs]
![C logo]	[C][C integration]	[`wasm.h` header]	[Learn][c docs]
![C++ logo]	[C++][C integration]	[`wasm.hh` header]	[Learn][c docs]
![C# logo]	[C#][C# integration]	[`WasmerSharp` NuGet package]	[Learn][c# docs]
![D logo]	[D][D integration]	[`wasmer` Dub package]	[Learn][d docs]
![Zig logo]	[Zig][Zig integration]	[`wasmer` Zig package]	[Learn][zig docs]
![Python logo]	[Python][Python integration]	[`wasmer` PyPI package]	[Learn][python docs]
![JS logo]	[Javascript][JS integration]	[`@wasmerio` NPM packages]	[Learn][js docs]
![Go logo]	[Go][Go integration]	[`wasmer` Go package]	[Learn][go docs]
![PHP logo]	[PHP][PHP integration]	[`wasm` PECL package]	[Learn][php docs]
![Ruby logo]	[Ruby][Ruby integration]	[`wasmer` Ruby Gem]	[Learn][ruby docs]
![Java logo]	[Java][Java integration]	[`wasmer/wasmer-jni` Bintray package]	[Learn][java docs]
![R logo]	[R][R integration]	no published package	[Learn][r docs]
![Postgres logo]	[Postgres][Postgres integration]	no published package	[Learn][postgres docs]
![Swift logo]	[Swift][Swift integration]	no published package
![Dart logo]	[Dart][Dart integration]	[`wasm` pub package]
![Crystal logo]	[Crystal][Crystal integration]	no published package	[Learn][crystal docs]
![Lisp logo]	[Lisp][Lisp integration]	no published package
![Julia logo]	[Julia][Julia integration]	no published package
![VLang logo]	[V][vlang integration]	no published package
![Ocaml logo]	[OCaml][OCaml integration]	[`wasmer` OCaml package]

👋 Missing a language?

Develop

We have different guides to help you develop Wasmer:

[Build Wasmer from Source]!(./docs/BUILD.md)
[Testing]!(./docs/TEST.md)
[Security advisory]!(./docs/SECURITY.md)

Contribute

We appreciate your help! 💜

We recommend reading the following guide on how to contribute into a complex project successfully: https://mitchellh.com/writing/contributing-to-complex-projects

Check our docs on how to [build Wasmer from source]!(./docs/BUILD.md) or test your changes.

Community

Wasmer has an amazing community of developers and contributors. Welcome, please join us! 👋

README also in: 🇨🇳 中文 -Chinese • 🇩🇪 Deutsch-German • 🇪🇸 Español-Spanish • 🇫🇷 Français-French • 🇯🇵 日本語 -Japanese • 🇰🇷 한국어 -Korean.