Wasmtime

A small and efficient runtime for WebAssembly & WASI

Start using the latest developments in WebAssembly and WASI with the Wasmtime runtime.

Wasmtime supports the WebAssembly Interface Types proposal:

Installing Wasmtime

It looks like you’re running macOS or Linux. To download and install Wasmtime, run the following in your terminal, then follow the on-screen instructions.

curl https://wasmtime.dev/install.sh -sSf | bash

It looks like you’re running Windows. To install Wasmtime, download and run the following, and then follow the onscreen instructions.

Wasmtime Installer

If you’re a Windows Subsystem for Linux user run the following in your terminal, then follow the on-screen instructions to install Wasmtime.

curl https://wasmtime.dev/install.sh -sSf | bash

If you’re running macOS or Linux, download and install Wasmtime by running the following in your terminal and following the on-screen instructions.

curl https://wasmtime.dev/install.sh -sSf | bash

If you are running Windows, download and run the Wasmtime Installer then follow the on-screen instructions.

Alternatively, you can also download releases for all supported platforms from the Wasmtime GitHub page.

Building Wasmtime

System requirements

Building Wasmtime requires a recent version of the Rust compiler and toolchain, and a C++ toolchain released after 2007.

Downloading and building the sources

With those requirements in place, you can download and build the Wasmtime source:

git clone --recurse-submodules \
    https://github.com/bytecodealliance/wasmtime.git
cargo build --release

Targeting Wasmtime

We're maintaining WASI toolchains for Rust and C/C++. For an introduction to those, please see our WASI tutorial, which has sections on C and Rust.

See our demos repository for some examples of content to run in, and ways to use Wasmtime.

For more information on WASI, see the WASI homepage.