LaTeX renderer

Paste in LaTeX and the typeset equation or document appears beside it. LaTeX renderer is a small web tool by Simon Willison. On his blog he says Tiny Little Office inspired him to have Claude Code (Opus 5.5 Extra) build a similar tool for LaTeX. A single equation is typeset with MathJax, and a full document or a passage of prose with faster-latex; a toolbar switch flips between Edit and Rendered. You can type the source, load it from a URL or a GitHub Gist, or start from a built-in example. The LaTeX lives in the URL fragment, the part after the #, so when you copy the link and send it on, the other person opens the same thing.

Who it's for:students and teachers writing papers or course notes who want to see how their math comes out, and readers curious what kind of small tool Claude Code can build.

Before you start: open it in a browser. No install, sign-in or payment. The interface is in English, and we haven't tried it on a phone. The page loads its typesetting libraries from a CDN, and loading from a URL or Gist also goes online. A share link carries your LaTeX source, so don't share private documents that way. The author says rendering happens in a sandboxed iframe to guard against cross-site scripting (XSS). The source code is under the Apache-2.0 license.

Based on the author's blog and the project's public documentation. Not tested by AI Inspiration World.