Top 10 Best Mermaid Online Software of 2026

Miro connects code-based diagramming with a shared visual workspace: developers can bring in Mermaid from an editor, documentation, or an AI chat, and collaborators can work with the rendered shapes on the board. Teams can also use MCP-connected agents, including Claude Code and Cursor, to create, update, or read diagrams.

A practical tradeoff is that the collaborative editing experience happens on Miro’s canvas, while teams that prioritize repository workflows can export edits as Mermaid syntax. This suits an engineering team reviewing an application flow with product managers or clients who need to understand the diagram without editing code.

Excalidraw converts supported Mermaid input into canvas elements that users can reposition and restyle with its drawing controls. Libraries, image insertion, and real-time collaboration rooms support diagram work with teammates. The React package exposes an imperative API and scene data for embedding and programmatic export.

Mermaid source and canvas edits do not stay synchronized, so code-first teams need to regenerate diagrams after changing their source. The workflow suits design reviews and workshops where participants refine an imported flowchart visually, but not documentation pipelines that require diagrams to track source changes.

draw.io lets users insert Mermaid code as an image or convert it into editable draw.io shapes. The same canvas supports manually drawn diagrams, connectors, templates, and exports in formats including SVG, PNG, PDF, and XML. Google Drive, OneDrive, GitHub, and other integrations give teams options for storing diagram files.

Converting Mermaid diagrams into native shapes makes visual adjustments possible, but subsequent edits happen on the draw.io canvas rather than in the Mermaid source. Teams that need Mermaid code to remain the authoritative, continuously editable representation may prefer a Mermaid-focused editor.

Lucidchart brings a visual-first approach to Mermaid workflows, combining supported Mermaid import with a full diagram editor. Users can edit imported diagrams with drag-and-drop shapes and use templates for flowcharts, UML, entity relationship diagrams, and network maps.

Gliffy creates flowcharts, UML diagrams, network maps, and wireframes in a browser with a drag-and-drop editor. Its close integration with Confluence and Jira lets teams embed diagrams in documentation and link them to project issues.

Whimsical suits product teams mapping user flows and interface ideas on a shared visual canvas. It combines flowcharts, mind maps, wireframes, and documents with collaborative editing and comments. Unlike Mermaid editors, it uses visual canvas controls rather than editable Mermaid source, which limits its fit for version-controlled diagram-as-code workflows.

Mermaid Chart pairs editable Mermaid source with a rendered diagram, making diagram-as-code the core workflow rather than a secondary export format. Its browser editor supports flowcharts, sequence diagrams, class diagrams, entity-relationship diagrams, Gantt charts, and other Mermaid types.

Among browser-based diagramming tools, Terrastruct targets software architecture and centers its workflow on D2 rather than Mermaid. D2 defines diagrams as text and supports sequence diagrams, layers, scenarios, and multiple layout engines. Its CLI can render diagrams in code-based workflows, while D2 syntax requires a learning step for teams accustomed to Mermaid.

Mermaid Live Editor turns Mermaid text into rendered diagrams in a browser, with source and preview shown side by side. Its editor supports flowcharts, sequence diagrams, class diagrams, state diagrams, entity-relationship diagrams, Gantt charts, and other Mermaid formats.

Kroki suits developers who need Mermaid diagrams rendered from text in documentation pipelines rather than edited on a visual canvas. Its HTTP API converts Mermaid source into SVG or PNG and also supports formats such as PlantUML and Graphviz. Teams can use the hosted service or deploy Kroki with Docker, while editing and collaboration stay in their existing tools.