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Tool: LaTeX renderer Simon Willison’s Weblog Newsletter 15th October 2026 Tool LaTeX renderer — LaTeX renderer turns LaTeX source into a rendered view, either a single display equation typeset by MathJax or a full document or prose fragment typeset by faster-latex, with a live preview beside the editor and a toolbar switch between Edit and Rendered views. Source can be typed, loaded from a URL or GitHub Gist, or picked from built-in examples, and the page keeps the LaTeX in the URL fragment so it can be shared as a readable or compressed link. Inspired by Paul Ford and Aboard Foundary's new web app Tiny Little Office, which provides a suite of web app content editors (a Word Processor, Outliner, Presentation Builder, Spreadsheet, Calculator, Drawing Tool, Diagram Maker, Animator, Calendar, and Trip Planner). Tiny Little Office's signature trick is to store all of the document data in the #fragment section of the URL, so every document created using it becomes a bookmarkable and shareable link. It also has an llms.txt file telling agents how to construct URLs that will render as documents. Claude used that file to generate this link to a deck that explains how the URL format works: Tiny Little Office inspired me to have Claude Code (Opus 5.5 Extra) build a similar tool that works with LaTeX. Here's the sequence of prompts I used: I want a tool where you can link to it with a fragment hash #code-here and it treats that code as LaTeX and renders it really effectively. It should also support a prefix which means the latex is compressed with a custom compression dictionary optimized for latex. Use the best available latex render library from a CDN (consider WebAssembly too). If loaded without a fragment hash show an editor you can paste latex into and then toggle to a "rendered" view. That rendered view should be bookmarkable. The #fragment view should let you switch to edit source too. Since it was working in my tools repo I told it to take inspiration from the mechanism used by my existing SVG in Markdown tool as protection against XSS risks: Safe from XSS? We could run in an iframe sandbox like we do on the SVG markdown render project I had it copy the Gist/URL loading feature from that tool as well: We should have an option to load latex from a URL (or gist) similar to the markdown SVG tool Here's an example link. The tool uses Pako 2.1.0, MathJax 4.1.3, faster-latex 0.3.1, and DOMPurify 3.4.16. Recent articles Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026 A new feature for my blog, built using my voice - 9th October 2026 Claude Haiku 5.5 - 7th October 2026 We're going to need default hard budget caps on pretty much everything - 3rd October 2026 This is a beat by Simon Willison, posted on 15th October 2026. latex 4 paul-ford 21 tools 80 urls 80 ai 2,284 generative-ai 2,026 llms 1,992 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026