Linux Sandbox
Boot a full Linux container in your browser. No server, no upload, your files stay local.
First boot downloads ~277 MB to your browser and caches it forever. Subsequent boots are instant.
In Browser fetch mode the sandbox routes outbound traffic through fetch — works for CORS-friendly sites only.
The Localhost sidekick mode tunnels real packets through a tiny daemon you run on your machine (macOS arm64 or Linux x86_64/arm64 — setup →); no CORS limits.
What's in this image?
Shell & tools: bash, coreutils, git, curl, wget, jq, vim, less, grep, sed, gawk, findutils, ncurses, tar, gzip.
Languages: Node.js 22 + npm, Python 3.12 + pip, PHP 8.3 (phar / curl / mbstring / openssl / iconv / dom extensions). Pure-language scripts and pre-built wheels work; anything needing gcc at install time (sharp, bcrypt-native, psycopg2-source) does not — no build toolchain in the image.
Runs as user with /home/user as working dir. Powered by container2wasm v0.8.4 on Alpine 3.21 — Bochs CPU emulator running an x86_64 Linux kernel in WebAssembly.