HedgeDoc
Self-hosted real-time collaborative markdown editing.
HedgeDoc (formerly CodiMD) is an open-source, self-hosted web editor for collaborative markdown: everyone with the link edits together in real time, with a rendered preview beside the source pane.
It supports GFM, KaTeX math, Mermaid and PlantUML diagrams, and a presentation mode that turns notes into slides. Organizations run it internally when notes must stay on their own infrastructure.
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Try markdown before you install anything
The free online markdown editor gives you a live side-by-side preview in the browser — a quick way to test the syntax HedgeDoc uses, with nothing to download or sign up for.
Open the editor