FileLens – Markdown & JSON Viewer

Beautifully read README, Markdown and JSON files. Private, customizable, with zero permissions.

Turn plain Markdown and JSON into beautiful, customizable documents. FileLens transforms README, Markdown, and JSON files into a clean, customizable reading experience directly in your browser. Instead of a wall of monospace text, enjoy rendered headings, tables, syntax-highlighted code blocks, an interactive JSON tree, and an outline sidebar that helps you navigate large documents with ease. With more than 40 appearance and typography settings, you can customize fonts, colors, spacing, layout, content width, and themes to create a reading experience that matches your workflow. Whether you're reading project documentation, browsing GitHub README files, exploring API responses, inspecting configuration files, or previewing local files, FileLens makes technical content easier to read. BEAUTIFUL RENDERING • Rich rendering with headings, tables, lists, blockquotes, links, and syntax-highlighted code blocks • Interactive collapsible tree with typed values, entry counts, and smooth navigation • Outline sidebar that follows your reading position • One-keystroke switch between rendered view and raw source • Clean, print-friendly layout YOUR READING, YOUR STYLE Reading isn't one-size-fits-all. FileLens gives you complete control over how your documents look. • 40+ appearance and typography settings • Customize fonts, font sizes, colors, spacing, and line height • Adjust content width, page padding, borders, and layout • Fine-tune light and dark themes • Live preview while you customize • Preferences are automatically saved Create a reading experience that feels comfortable for long documentation sessions. FAST & RESPONSIVE Renderers load only when needed, keeping the extension responsive without loading unnecessary code for the content you're viewing. PRIVATE BY DESIGN Everything happens locally in your browser. • No network requests • No telemetry • No analytics • No tracking • No external fonts • No CDN-hosted scripts Nothing you open is ever sent anywhere. ZERO PERMISSIONS AT INSTALL FileLens requests no permissions during installation. Enable Chrome's built-in file access for local files, and choose exactly which websites the extension can run on. You're always in control. WORKS WITH • Local files (file://) • Websites you explicitly enable • Localhost during development with live reload Whether you're reading documentation, reviewing API responses, or exploring project files, FileLens provides a cleaner, more customizable, and privacy-focused way to read technical content in Chrome.