HackMD is a real-time, multi-platform collaborative Markdown editor. You can use HackMD to write notes with other people on your computer, tablet, or phone. HackMD provides a variety of document templates and allows users to push documents to GitHub. You can import and export documents from Dropbox, Google Drive, and GitHub gists.

The HackMD Markdown interface

HackMD supports CommonMark and other markup syntax, such as:

  • MathJax for formulas
  • Mermaid and Graphviz for UML diagrams
  • Vega-lite for data visualizations

HackMD is the commercial version of CodiMD.

HackMD Markdown Support

HackMD provides support for the following Markdown elements.

Element Support Notes
Headings Yes
Paragraphs Yes
Line Breaks Yes
Bold Yes
Italic Yes
Blockquotes Yes
Ordered Lists Yes
Unordered Lists Yes
Code Yes
Horizontal Rules Yes
Links Yes
Images Yes
Tables Yes
Fenced Code Blocks Yes
Syntax Highlighting Yes
Footnotes Yes
Heading IDs No
Definition Lists Yes
Strikethrough Yes
Task Lists Yes
Emoji (copy and paste) Yes
Emoji (shortcodes) Yes
Automatic URL Linking Yes
Disabling Automatic URL Linking Yes
HTML Yes

Support for Additional Syntax Elements

As an added bonus, HackMD provides support for several obscure elements.

Element Markdown Rendered Output
Abbreviation *[HTML]: Hyper Text Markup Language
The HTML specification is maintained by the W3C.
The HTML specification is maintained by the W3C.
Highlight ==word or phrase== word or phrase
Subscript H~2~O H2O
Superscript X^2^ X2

See Also