Free productivity · Step-by-step guide
How to Create Flowcharts Free With Mermaid Live Editor
Create and export a flowchart using Mermaid text syntax in the browser without buying diagramming software.
What to know first
Traditional flowcharts require dragging boxes and arrows into place. Mermaid lets you describe a diagram using readable text, and its Live Editor shows the result as you type. This is useful for documenting a process, a decision tree or a developer workflow. You can begin without a paid diagramming subscription, but you should still review the diagram for accuracy before publishing it.
1Open the official Mermaid documentation
Visit mermaid.js.org to read the syntax guide and locate the Live Editor. Mermaid is a text-based diagramming system. The separate Mermaid Chart commercial product has its own features, so do not confuse a paid collaboration offer with the free open-source diagram syntax or publicly accessible editor. Start with a basic flowchart example from the documentation.
2Write a minimal flowchart
Try the text: flowchart TD, followed by A[Start] --> B{Check complete?}, and lines B -->|Yes| C[Publish] and B -->|No| D[Revise]. In the editor these lines form a decision diagram. Use descriptive node labels and keep branches consistent. If the preview reports a parse error, check brackets, arrow symbols and indentation before assuming the website is unavailable.
3Turn a real task into diagram steps
Write down the process in plain language first: what starts it, which decision changes the path and when it ends. Convert only those steps into nodes. For a content publishing workflow, a branch could ask whether a draft has passed fact checking. Add a No path to revision and a Yes path to publication. The diagram should match your actual workflow, not the other way around.
4Export a clean image or reusable source
The Mermaid documentation describes exporting diagrams, including SVG options, and keeping editable Mermaid source. Choose SVG when a scalable diagram is useful in documentation. Save the source text alongside the exported graphic because changing labels in an image is harder than editing the original code. Check text legibility at mobile width before embedding the final diagram on a webpage.
5Avoid common diagram mistakes
Use one clear purpose per diagram and avoid oversized charts full of crossing arrows. Give each Yes and No edge a label, keep terminology consistent and explain any symbols the audience may not know. Do not paste private internal architecture, confidential identifiers or passwords into an untrusted third-party web editor. For sensitive projects, use a locally approved workflow.
Common questions
Do I need to install anything to try Mermaid?
You can experiment in an online Live Editor linked from the official documentation. Installation is only needed for certain local integrations.
Can I edit a diagram after exporting?
Keep the Mermaid source text. It is easier to revise and re-export than to edit a static PNG image.
Official sources and further reading
Check the provider’s current instructions before relying on menus, prices or account restrictions.