AI Block Diagram generator
Describe your block diagram in plain English and get editable Mermaid code instantly. Lay out system components in a grid you control, with spans and nesting.
Example prompts for a block diagram
- “Smart home system components”
- “Three-tier web application”
- “CPU and memory hierarchy”
What a Mermaid block diagram looks like
Example block diagram
block
columns 3
Client["Browser"]:3
space:3
Web["Web server"] API["API"] Worker["Worker"]
space:3
DB[("PostgreSQL")]:2 Cache["Redis"]
Client --> API
API --> DB
Worker --> DB
API --> CacheWant to write it by hand? See the full Mermaid block diagram syntax and examples, or browse templates.
Frequently asked questions
How do I generate a block diagram with AI?
Describe the block diagram you need in the box above and click Generate. The AI writes valid Mermaid block diagram code that renders instantly, and you can open it in the editor to refine it.
Is the AI block diagram generator free?
You can try it free — 5 AI generations in total, no sign-up needed. Starter includes 500 AI conversations a month and Pro is unlimited. Manual editing and export stay free after that.
Can I edit the generated block diagram?
Absolutely. The output is plain Mermaid code — edit it by hand in the live editor, or ask the AI for changes in natural language.