Compiling C in the browser using WebAssembly

In plain words

Compiling C in the browser using WebAssembly is a development tool that enables C code compilation directly within a web browser through WebAssembly technology. It is designed for developers who want to run C compilation workflows without leaving their browser environment. The tool stands out by removing the need for local development setup while maintaining the ability to work with C code compilation.

written from the facts on this page · September 2026

From the sources

We’ve reached a major milestone in making any software run with WebAssembly. Thanks to the newest release of Wasmer (4.4) and the Wasmer JS SDK (0.8.0) you can now run clang anywhere Wasmer runs! This allows compiling C programs from virtually anywhere. Including Javascript and your preferred browser! (we tested Chrome, Safari and Firefox and everything is working like a charm). For those eager to see it in action, head over to wasmer.sh to try a live demo (note: it requires a 100MB download): Note: we attempted running clang few years ago, but because of WASI limitations we were unable to call posix_spawn which limited the usage and usability of clang in the browser, Firefox and Safari…from wasmer.io

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