free online gantt chart
Mermaid gantt syntax turns a plain-text task list into a visual bar schedule, with no spreadsheet or project-management software required. This preset already loads a sample schedule covering planning and execution.
The done tag (or active, or crit) before the id changes the bar's visual style, useful for tracking progress.
The excludes weekends directive makes the duration calculation automatically skip weekends.
Mermaid is an open-source JavaScript library that turns plain text, written in its own Markdown-like syntax, into diagrams rendered as SVG. Instead of manually drawing boxes and arrows in a graphics tool, you describe the diagram's structure in a few lines of text and the library computes the layout and draws the result.
No, as long as the following tasks use after instead of a fixed date. In that case, the whole chain of dependent tasks reflows automatically when you change an earlier task's duration.
Yes, as many as needed. Each section line starts a new visual grouping of tasks, useful for separating phases like planning, execution and testing.
Yes, the dateFormat line accepts other patterns (for example DD/MM/YYYY), as long as every date in the diagram follows the same pattern declared at the top.
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Your Mermaid code and the rendered diagram stay in your browser, processed by the mermaid.js library. Nothing is sent to any server.