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For developers and technical founders

Describe a system, get the diagram

The Architecture Diagram Generator turns a plain-English description of a system into a clear diagram: system architecture, user flow, sequence or database (ER). It renders live on the page, and you get the Mermaid code to paste into GitHub, Notion or your docs, plus a breakdown of every component and its weak spots.

  • Free, no sign-up
  • Results in about 30 seconds
  • 10 runs a day
  • Input not stored
mohitgoyal.in/tools/architecture-diagram-generator

Architecture Diagram Generator

System diagrams from a plain description

Your input

Name the parts and say how data moves between them.

Diagram type
10 of 10 free runs left today

Not saved on this site. Don't paste passwords or confidential data.

Result· Ready

Your result will appear here

Fill in the form, or press Try an example to see what you get:

  • A diagram rendered on the page
  • Mermaid code to paste into GitHub, Notion or docs
  • A component-by-component breakdown
  • Weak spots and single points of failure
  • One suggestion to improve the design

How it works

How to use the Architecture Diagram Generator

  1. Describe the system

    The apps, services, databases and third-party APIs, and what talks to what.

  2. Pick a diagram type

    Architecture, user flow, sequence or database (ER), depending on what you need to explain.

  3. Copy the diagram

    See it rendered, then copy the Mermaid code into GitHub, Notion or your docs.

What you get

Inside every result

  • A diagram rendered on the page
  • Mermaid code to paste into GitHub, Notion or docs
  • A component-by-component breakdown
  • Weak spots and single points of failure
  • One suggestion to improve the design

Who it's for

Built for

  • Developers documenting a system
  • Technical founders explaining their product to investors or new hires
  • Students learning system design
  • Teams planning a new feature or a migration

Why diagrams beat paragraphs

A system description is hard to hold in your head; a diagram shows every part and connection at once. It is the fastest way to onboard a developer, spot a missing piece or agree on a design before anyone builds it.

Which diagram should I choose?

Architecture shows the parts of a system and how they connect. User flow shows the steps a person takes. Sequence shows the order of messages between parts for one action, such as checkout. Database (ER) shows tables, their key fields and how they relate.

What is Mermaid?

Mermaid is a text format for diagrams. GitHub, GitLab, Notion, Obsidian and many documentation tools render it directly, so the diagram lives next to your code and stays easy to update.

Copy the code block from your result and paste it into any of them, or into mermaid.live to edit it visually.

Guides and services

Questions

Frequently asked

Can I edit the diagram?+

Yes. Copy the Mermaid code, change the text and paste it into mermaid.live, GitHub or Notion to see the updated diagram.

Does GitHub support Mermaid diagrams?+

Yes. Put the code in a Markdown file inside a code block marked mermaid and GitHub renders it as a diagram.

How detailed should my description be?+

Name each part, such as apps, services, databases and third-party APIs, and say what talks to what. The more specific the connections, the more accurate the diagram.

Can it design the architecture for me?+

It draws what you describe and points out weak spots. For a recommended stack, try the Tech Stack Advisor, and for a full design review, book a free call.

Is this tool free?+

Yes. Every tool on this site is free with no sign-up. Each visitor gets 10 runs of each AI tool per day, which keeps the tools fast and available for everyone. The tools that use no AI have no daily limit.

Is what I paste saved or shared?+

No. Your input is sent to the AI model (Claude by Anthropic) only to generate your result, and it is not stored on this site. Still, do not paste passwords, financial details or anything confidential.

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