gistpreview.github.io

gistpreview.github.io renders any GitHub Gist as a live HTML page. Pass the gist ID as a query param (?<gist_id>) and it fetches via GitHub API + document.write(). Entire thing is 2 files (index.html + main.js), no build step, trivially self-hostable. Useful for quick HTML/CSS demos without spinning up CodePen or deploying anything.