# Markdown Editor (markdowneditor.cc)

> Free, privacy-first, local-first Markdown editor with live preview.
> Runs entirely in the browser: no account, nothing uploaded. Works
> offline as a PWA. Renders LaTeX math (KaTeX), Mermaid and Graphviz
> diagrams, Vega-Lite charts and syntax-highlighted code (Shiki).
> Segmented preview rendering keeps typing smooth in documents of
> 100KB+ and thousands of lines. Documents stay on the device in
> IndexedDB and can sync with real files via the File System Access API.

The editor UI is available in English, Vietnamese, Japanese, French,
German, Korean, Ukrainian, Indonesian, Spanish, Hindi and Chinese
under /{locale}/ paths.

## App

- [Editor](https://markdowneditor.cc/en): the live editor (use /{locale} for other languages)

## Learn

- [Features](https://markdowneditor.cc/en/features): full capability overview
- [LaTeX math](https://markdowneditor.cc/en/latex): inline and display equations via KaTeX
- [Diagrams](https://markdowneditor.cc/en/diagrams): Mermaid, Graphviz DOT and Vega-Lite
- [Markdown cheat sheet](https://markdowneditor.cc/en/cheatsheet): syntax reference with examples
- [Templates](https://markdowneditor.cc/en/templates): 400+ ready-to-use Markdown templates by field (raw .md at /templates/<category>/<slug>.md)
- [Template kits](https://markdowneditor.cc/en/kits): curated, ordered template sets per role (software architecture, API design, system design, SRE, security engineering, AI engineering, AI governance, SDLC document set, technical documentation)
- [About](https://markdowneditor.cc/en/about): project story, privacy model, FAQ

## Project

- [Contact](mailto:hi@markdowneditor.cc): Ed Nguyen