This flowchart generator is built on Mermaid syntax, which is simple yet powerful. Here is a detailed guide:
Basic Operations: Enter Mermaid diagram code in the left editor panel, then click the "Render Preview" button. The rendered chart will appear in the right preview panel in real time. The code editor supports multi-line input and auto-indentation, and you can modify the code at any time and re-render.
Using Templates: Click on any "Quick Template" button above, and the tool will automatically populate the editor with sample code for the corresponding diagram type. Templates include basic flowchart, sequence diagram, Gantt chart, class diagram, state diagram, ER diagram, user journey map, and mind map β a total of 8 commonly used types. You can modify node text and connections based on the template.
Theme Switching: Use the "Theme" dropdown to switch between color schemes. The default theme uses blue-violet tones, the dark theme is suitable for dark-background presentations, the forest theme uses green tones, and the neutral theme uses gray tones. All themes are applied to the preview chart in real time.
Exporting Charts: After rendering, click the "Export PNG" or "Export SVG" button in the top-right corner of the preview panel to save the chart as a high-resolution image. PNG format is ideal for documents and presentations, while SVG is a vector graphic that can be scaled infinitely without losing quality, making it perfect for web pages.
The flowchart generator has a wide range of applications in work and study. Here are several typical use cases:
Software Development: During the requirements analysis and system design phases, use flowcharts to describe business logic and system architecture. Sequence diagrams can clearly show the call relationships between modules, while class diagrams help teams understand object-oriented design structures. Compared to hand-drawing or using heavy design tools, this tool allows for rapid iteration and on-the-fly modifications.
Project Management: Use Gantt charts to plan and track project progress, set milestones and critical paths. Project managers can export Gantt charts and embed them into project documents or weekly reports, allowing team members to visually understand current progress and upcoming tasks. State diagrams are suitable for describing the lifecycle flow of work items.
Education and Training: Teachers and trainers can use flowcharts to explain the logical relationships of complex concepts and use sequence diagrams to show timelines of historical events or operational procedures. Compared to static images in traditional PowerPoint, Mermaid code can be modified at any time, ensuring that teaching materials are kept up to date.
Technical Documentation: When writing READMEs, Wikis, or technical blogs, embedding Mermaid code automatically generates charts. Major platforms such as GitHub, GitLab, Notion, and others already natively support Mermaid rendering. Use this tool to preview and debug before pasting into your documents to ensure correct display.
Mermaid Syntax Basics: Mermaid is a text-based diagram description language that was created in 2014. Its core philosophy is "code is the chart" β developers simply write a text description to get professional and aesthetically pleasing visual charts. All Mermaid charts start with a declarative keyword such as flowchart, sequenceDiagram, classDiagram, etc.
Flowchart Directions: After the flowchart keyword, you can specify the chart direction: TD (Top Down), LR (Left Right), BT (Bottom to Top), or RL (Right to Left). Node shapes are defined by bracket types: [] for rectangle, () for rounded, {} for diamond decision, [[]] for subroutine, and (( )) for circle.
Related Tool Ecosystem: Mermaid has been deeply integrated into numerous productivity tools including Notion, GitHub, GitLab, Jira, Typora, and Obsidian. Once you learn Mermaid syntax, you can write chart code directly in these platforms without additional tools. Furthermore, Mermaid supports customizing theme colors, fonts, and line widths via the %%init%% directive.
Mermaid is a text-based diagram description language. You simply write text code, and the tool automatically renders it into professional flowcharts, sequence diagrams, Gantt charts, and other visual diagrams. It is similar to Markdown but specifically designed for creating diagrams.
You can export diagrams as PNG high-resolution images or SVG vector graphics. PNG is ideal for documents and presentations, while SVG works best on web pages and can be scaled infinitely without losing quality.
No. All diagram rendering happens locally in your browser using pure frontend technology. Your data is never uploaded to any server, ensuring complete privacy and security.
Yes, fully supported. Mermaid natively supports Unicode, so you can use Chinese, Emoji, and other multi-byte characters in node text with rendering quality identical to English.
The tool includes multiple built-in theme styles (Default, Dark, Forest, Neutral). Click the theme switcher to preview different styles in real time. You can also use the %%init%% directive in Mermaid code to customize colors and styles.
No. Both PNG and SVG exports are watermark-free high-resolution originals and can be used directly in commercial documents, presentations, or web pages.
Yes. After the initial load, the Mermaid library is cached in your browser. As long as the page remains open, you can continue editing and rendering diagrams even without an internet connection. However, the export feature requires Canvas API support in the browser.
The preview area supports scrolling. You can also use the zoom controls to adjust the display scale. If there are too many nodes, consider splitting them into multiple subgraphs or switching the direction (LR/BT) to optimize the layout.