Visio Viewer

Visio Viewer is a free, open-source Chrome extension that lets you
view Microsoft Visio files (.vsdx and .vsd) directly in your browser.
No Visio installation or cloud service required — everything runs
locally in your browser.

Features:
• SVG rendering with full shape, connector, and text support
• Zoom (scroll wheel + buttons), pan (drag), and zoom-to-fit
• Multi-page navigation with page names
• Light and dark theme (follows system preference)
• Open files via drag & drop, file picker, or URL
• Automatic interception of .vsdx links and downloads
• Keyboard shortcuts (arrows for pages, +/- for zoom, 0 for fit)
• Fully offline — all processing happens locally, no data leaves your browser

Powered by libvisio-ng, a pure-Python Visio parser running via Pyodide
(Python in WebAssembly).

Source code: https://github.com/yeager/visio-viewer-extension