Simon Willison’s Weblog

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28th May 2026

Tool markdown-svg-renderer — Renders markdown with a live preview from pasted text, a raw URL, or a GitHub Gist loaded through a `?url=` query parameter, and older `#url=` links redirect to that form. Standard formatting, tables, code blocks, and linkable heading anchors are supported, along with fenced SVG blocks that offer tabbed Rendered, PNG, JPEG, WEBP, AVIF, and Code views, plus an MP4 tab for animated SVGs encoded with ffmpeg.wasm.

A slightly customized Markdown rendering tool with special treatment for fenced code SVG blocks - it both renders the image and provides a tab for switching to the code view.

You can paste in Markdown or give it a URL to a CORS-enabled Markdown file or Gist. Here's an example where it loads a Markdown file full of LLM pelican logs for Opus 4.8.

This is a beat by Simon Willison, posted on 28th May 2026.

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