Overview
Marble is an online Markdown editor built for writing and working together in a shared workspace. It combines Markdown's plain-text format with an inline preview, allowing formatted content to remain visible while a document is being edited.
Notes stay in plain Markdown rather than being locked into a proprietary document format. Existing Markdown files can be opened in the editor, and completed notes can be downloaded or saved as PDF files.
Editing Features
The editor supports common Markdown content as well as richer technical and structured material. Its supported elements include:
- Inline Markdown previews
- Tables for structured information
- Code content
- LaTeX mathematics
- Mermaid diagrams
These capabilities let one document combine ordinary prose with technical notation, code, data layouts, and visual diagrams while retaining a Markdown source.
Collaboration
Marble supports real-time collaborative writing through shared links. Other participants can join a document without creating an account, reducing the setup needed for a quick review or joint editing session.
This shared workspace approach is suitable for drafting notes, refining technical documents, or editing Markdown with others while everyone sees changes during the session.
Portability and Tool Access
Because notes remain plain Markdown, they can move beyond the browser editor through file downloads. PDF export provides a fixed-format copy, while AI tools can also be connected to the notes. Together, these options keep the writing usable for collaboration, offline storage, document sharing, and external tool-assisted workflows.