Hey folks—sharing a weekend project that turned into something I actually use every day.

It’s a local‑first Markdown editor that runs entirely in your browser (Chrome extension). No accounts, no cloud sync, no telemetry. Open a .md file, edit with a clean WYSIWYG interface, and save straight back to disk.

Why I built it

• I bounce between README drafts, docs, and meeting notes. I wanted a fast editor that didn’t nag me to log in or push my files to someone’s server.
• I prefer seeing formatted text as I write, but I still want to keep everything in Markdown.

What it does

• Rich formatting: headings, lists, bold/italic/underline/strikethrough, blockquotes, inline/code blocks
• Tables: quick insert, plus a context menu to add/remove rows/columns
• Outline sidebar: auto‑generated table of contents; click to jump, collapse sections
• Dark mode with preference saved
• Zoom controls, undo/redo, distraction‑free canvas
• Open/Save via native file picker, Export to PDF (print‑optimized)
• Color + highlight pickers (20+), clear formatting button

Under the hood

• Vanilla JS, HTML/CSS (no frameworks)
• Marked.js for Markdown parsing
• Turndown.js for HTML → Markdown
• File System Access API for native open/save
• ContentEditable for the WYSIWYG bits

Install

• Dev mode: clone the repo and “Load unpacked” → chrome-extension folder
• Chrome Web Store is planned once I polish a few edges

Repo github.com/ajitgoel/local-markdown-file-editor

What’s next

• Find/replace, word count, split preview, custom keyboard shortcuts, export to HTML
• Multiple tabs and image embed are on the roadmap

If you try it:

• Tell me where it breaks or feels clunky
• Feature ideas welcome (especially around tables, shortcuts, and PDF export)
• If you care about privacy and offline tools, I’d love your feedback

If this sounds useful, a star on GitHub helps visibility—thanks!