Online Markdown Viewer

Online Markdown Viewer is a browser extension designed to convert web pages, AI chat transcripts, and local files into clean, readable Markdown or HTML. It provides a sidebar interface that allows users to extract articles, capture AI conversations, view and render Markdown and JSON files, and preview HTML content without ads or clutter. The tool is aimed at researchers, developers, writers, note-takers, and AI power users who need to save, organize, and work with structured content from a variety of online and local sources.

Key features include one-click conversion of articles, documentation, and blogs into Markdown, with automatic removal of ads, navigation, and other distractions. md file. The extension preserves headings, tables, links, and code blocks, and supports syntax highlighting for 37 programming languages. For AI chat platforms such as ChatGPT, Claude, Copilot, Gemini, and Grok, it captures entire conversations, generates a table of contents, and allows users to select specific topics for export, copying, or printing. YouTube transcript capture is also supported, enabling users to extract timestamped lines, search within transcripts, and save or copy the results as Markdown.

The extension renders math formulas with KaTeX and diagrams with Mermaid, providing clear display of mathematical content and flowcharts. json files directly in the sidebar, with formatted previews for both. A clean HTML reading mode is available, and both light and dark modes are supported for comfortable viewing.

Online Markdown Viewer is available for Chrome, Edge, and Firefox browsers. It is completely free and does not require an account or sign-up. All processing occurs locally in the browser, ensuring privacy with no network calls or data collection. The extension works offline and does not require server or API access. ca.