{"slug": "video-compressor", "title": "Video compressor", "summary": "Simon Willison released a free web-based video compressor that runs FFMPEG entirely in the browser via WebAssembly, built with Claude Fable 5.1 in Claude Code for web. The tool, available at tools.simonwillison.net/video-compressor, lets users optimize videos without uploading files to a server, and was created to publish a compressed version of a demo video for his Equal Earth animation.", "body_md": "**Tool:** [Video compressor](https://tools.simonwillison.net/video-compressor)\n\nI recorded a short demo video of [my Equal Earth](https://simonwillison.net/2026/Sep/7/equal-earth/) animation on my phone and wanted to publish an optimized version of that video (using FFMPEG) on my blog, so I had Claude Fable 5.1 in Claude Code for web [build me this tool](https://claude.ai/code/session_01QHTdJZ4xg6TZfDXCmuvAE9) using the WebAssembly build of FFMPEG.\n\nTags: [ffmpeg](https://simonwillison.net/tags/ffmpeg), [video](https://simonwillison.net/tags/video), [webassembly](https://simonwillison.net/tags/webassembly), [claude](https://simonwillison.net/tags/claude), [claude-code](https://simonwillison.net/tags/claude-code), [claude-mythos-fable](https://simonwillison.net/tags/claude-mythos-fable)", "url": "https://wpnews.pro/news/video-compressor", "canonical_source": "https://simonwillison.net/2026/Sep/7/video-compressor/", "published_at": "2026-09-07 18:29:07+00:00", "updated_at": "2026-09-07 22:00:54.235690+00:00", "lang": "en", "topics": ["developer-tools", "ai-tools"], "entities": ["Simon Willison", "Claude Fable 5.1", "Claude Code", "FFMPEG", "WebAssembly"], "alternates": {"html": "https://wpnews.pro/news/video-compressor", "markdown": "https://wpnews.pro/news/video-compressor.md", "text": "https://wpnews.pro/news/video-compressor.txt", "jsonld": "https://wpnews.pro/news/video-compressor.jsonld"}}