Free AI Diagram Generator — One Sentence, One Diagram
The only diagram tool where you watch the diagram grow while the AI writes it. Type a sentence → Mermaid code streams in → the diagram updates on every word. Free, no sign-up.
✓ 17+ diagram types ✓ Free PNG/SVG export, no watermark ✓ Code fully editable
Supported diagram types
Flowchart, Sequence Diagram, Class Diagram (UML), State Diagram, ER Diagram, User Journey, Gantt Chart, Pie Chart, Mind Map, Timeline, Quadrant Chart, Git Graph, Sankey Diagram, Ishikawa Diagram, Architecture Diagram, XY Chart and Treemap — with more on the way.
- Flowchart
- Sequence Diagram
- Class Diagram
- State Diagram
- ER Diagram
- User Journey
- Gantt Chart
- Pie Chart
- Mind Map
- Timeline
- Quadrant Chart
- Git Graph
- Sankey Diagram
- Ishikawa Diagram
- Architecture Diagram
- XY Chart
- Treemap
- 1. Describe your diagram in the input box
- 2. Hit generate and watch it draw live
- 3. Keep chatting to refine, or start a new session
No sign-up required: 1 free generation. Sign up for 3 more (valid for 1 year).
Your diagram will appear here. Pick a type, describe it, and hit Generate.
Generated code is fully editable - tweak the Mermaid code and the diagram updates live.
Flowchart, Sequence Diagram, Class Diagram (UML), State Diagram, ER Diagram, User Journey, Gantt Chart, Pie Chart, Mind Map, Timeline, Quadrant Chart, Git Graph, Sankey Diagram, Ishikawa Diagram, Architecture Diagram, XY Chart and Treemap
How to Create a Diagram with AI
From blank page to exported image in four steps:
- 1
Describe It
Type what you want in plain language: "user submits an order, system checks stock, then creates payment". Or paste requirements and notes.
- 2
Watch It Render
AI writes the Mermaid code and the diagram draws itself live on the right. Pick from 17+ diagram types.
- 3
Tweak & Export
Edit the code to fine-tune labels and layout — the preview updates as you type. Export to PNG or SVG.
- 4
Use It Anywhere
Drop the image into docs and slides, or paste the Mermaid code into GitHub, Notion, Obsidian and more.
A real Mermaid renderer, live in your browser — describe yours in the AI Tool
Diagram Faster with AI Diagram
from first idea to final image.
Diagram types
17+
and growing
Done in
5-10s
average time to a finished diagram
Free to try
1
generation without sign-up
Pricing
Start free. Upgrade when you need more generations.
Quick Pack
A lightweight one-off top-up.
Includes
- 50 generations, valid for 12 months
- 50 credits (1 credit per generation)
- All 17+ diagram types
- PNG & SVG export, no watermark
- Editable Mermaid code
- Save up to 50 sessions, 10 versions per diagram
Pay once, use for a full year.
Starter
For trying things out.
Includes
- 100 generations, valid for 12 months
- 100 credits (1 credit per generation)
- All 17+ diagram types
- PNG & SVG export, no watermark
- Editable Mermaid code
- Save up to 50 sessions, 10 versions per diagram
Pay once, use for a full year.
Standard
For daily diagramming.
Includes
- 250 generations, valid for 12 months
- All 17+ diagram types
- PNG & SVG export, no watermark
- Save up to 50 sessions
- 10 versions per diagram
Valid 12 months — best for regular users.
Premium
For teams and heavy users.
Everything in Standard, plus
- 450 generations, valid for 12 months
- All 17+ diagram types
- PNG & SVG export, no watermark
- Unlimited saved sessions, 50 versions per diagram
Valid 12 months, best value per credit.
What Users Say About AI Diagram
From engineers to PMs to students — anyone who needs a diagram fast.
Elena Vasquez
Backend Engineer
Pasted our API call chain as a sentence and got a clean sequence diagram in seconds. The AI streams it live and the Mermaid code goes straight into our repo.
Tom Becker
Product Manager
One sentence for a whole user flow, live preview while it draws, and the whole team reviews it on screen. No more fighting drag-and-drop editors.
Priya Sharma
Data Engineer
Describe your schema in plain English and the ER diagram comes out with correct relations and cardinality. SVG export drops right into Confluence.
Lucas Meyer
DevOps Lead
State diagrams for our deploy pipeline and order lifecycle, Gantt charts for release planning. Diagrams as code — they get reviewed with Git.
Hana Sato
CS Student
Free without signup, one generation to try. ER diagrams for my database course and architecture diagrams for my thesis. I even learned Mermaid from the examples.
Kevin O'Brien
Founder
Needed an architecture diagram for an investor deck: described it, watched it render, exported a watermark-free PNG. Ten minutes end to end.
What is AI Diagram and how does it work?
AI Diagram is a free AI diagram generator. You describe a diagram in plain language, and AI turns it into Mermaid code that renders live in your browser. The code is fully visible and editable, and you can export the result to PNG or SVG.
Which diagram types are supported?
Flowcharts, sequence diagrams, class diagrams (UML), state diagrams, ER diagrams, user journeys, gantt charts, pie charts, mind maps, timelines, quadrant charts and git graphs — 17+ types, with more added regularly.
Is AI Diagram free to use?
Yes. One free generation without sign-up; signing up adds 3 more generations (valid for 1 year). PNG/SVG export is always free and watermark-free — unlike most competitors.
Can I edit the generated diagram?
Absolutely. Every diagram is real Mermaid code, shown in full and editable in the code panel. Change any label, connection or layout and the preview updates instantly. You can also write Mermaid from scratch.
Where can I use the exported files and code?
Exported PNG/SVG images drop into docs, slides, wikis and design tools. The Mermaid code renders natively in GitHub, GitLab, Notion, Obsidian, Confluence and any Mermaid-compatible editor.
How is my data handled?
Your description is sent to the AI provider to generate the diagram, and we do not store your diagram content on our servers. Diagrams render locally in your browser. See our privacy policy for details.