Markdown Toolkit

Markdown Toolkit — a beautiful Chrome extension for previewing Markdown with Mermaid, LaTeX, themes and a rich toolbar.

Markdown Toolkit turns any Markdown file — on your computer or on the web — into a clean, beautiful, readable page. No copy-pasting into an online editor, no uploading your files anywhere. Just open a .md file and read it the way it was meant to look. Everything renders locally in your browser. Your files never leave your machine. ━━━━━━━━━━━━━━━━━━━━ WHAT IT DOES ━━━━━━━━━━━━━━━━━━━━ • Instant preview for .md, .markdown and .mdx files — both local (file://) and on the web • Full GitHub-Flavored Markdown: headings, tables, task lists, code blocks, blockquotes, footnotes • Interactive Mermaid diagrams — flowcharts, sequence, class, ER, Gantt and more, with zoom, pan, fit and a fullscreen lightbox • Beautiful math with KaTeX — inline and block LaTeX equations • Syntax highlighting for dozens of languages powered by Shiki • Automatic table of contents for quick navigation • A symbol / emoji palette for fast insertion • One-click export to HTML, and print-to-PDF for a polished document ━━━━━━━━━━━━━━━━━━━━ MADE TO LOOK GOOD ━━━━━━━━━━━━━━━━━━━━ • Auto, light and dark themes that follow your system • Adjustable font size and typography • Clean, distraction-free reading layout rendered in an isolated Shadow DOM so page styles never interfere ━━━━━━━━━━━━━━━━━━━━ PRIVATE BY DESIGN ━━━━━━━━━━━━━━━━━━━━ • 100% local rendering — no servers, no tracking, no accounts • Your documents are never uploaded or sent anywhere • Settings sync only through your own Chrome account (chrome.storage.sync) • Free and open source — MIT licensed ━━━━━━━━━━━━━━━━━━━━ GETTING STARTED ━━━━━━━━━━━━━━━━━━━━ 1. Install the extension. 2. To preview local files, open chrome://extensions, find Markdown Toolkit, and enable "Allow access to file URLs". 3. Open any .md file — on disk or on the web — and enjoy a clean preview. Use the toolbar to switch themes, jump around with the table of contents, or export your document. Source code and issues: https://github.com/boykioyb/markdown-toolkit Made with ♥ for people who read and write a lot of Markdown.