Interactive Visual Builder 100% Client-Side • Private

Build Mermaid Flowcharts Visually

Design process maps, decision trees, and system architectures visually while generating clean, standard Mermaid code.

Flowchart Guide

Editable process diagrams

Choose a flowchart template.

Switch between editing and the live result.

Flowchart Title Direction Theme

Nodes

0 nodes

Connections

0 connections

Live Mermaid preview

Flowchart preview

Preparing chart…

Private · local render

Building your first preview…

The preview updates as you edit.

Preparing editor…

When a flowchart works

Make complex decisions and workflows intuitive.

Flowcharts help teams visualize decision branches, state transitions, and step-by-step logic. The visual builder creates clean Mermaid syntax in real time.

Use clear node shapes

Use diamonds for decisions, rectangles for actions, and stadiums for start/end points.

Label branch paths

Annotate connector arrows with Yes, No, or specific condition labels to make paths obvious.

Keep direction consistent

Top-down (TD) and left-to-right (LR) orientations provide natural reading flow for readers.

Syntax Pattern

Mermaid flowchart syntax

Flowcharts begin with the flowchart directive followed by an orientation such as TD or LR. Connect node IDs using arrow connectors.

Open the Mermaid flowchart syntax reference

flowchart TD
  A(["New request"])
  BUrgent?
  C["Page on-call"]
  D["Add to queue"]

  A --> B
  B -->|Yes| C
  B -.->|No| D

Design, preview, and export Mermaid flowcharts

Flowcharts are one of the most useful diagram types for explaining decisions, onboarding paths, architecture choices, and release stages. This free visual builder lets you create diagrams interactively while keeping the source code clean and portable.

Frequently Asked Questions

Can I switch between visual editing and raw Mermaid code?

Yes. The visual builder updates the Mermaid code in real time, and you can edit the code directly at any moment.

What node shapes can I use?

Rectangles, rounded rectangles, stadium shapes, cylinders, circles, diamonds (decision nodes), and asymmetric flags.

Is this flowchart editor free to use?

Yes, completely free with no registration, watermark, or daily export limits.