Free AI Diagram Generator
Create Professional Diagrams Instantly
Transform your ideas into professional diagrams with our free AI diagram generator. Create flowcharts, ER diagrams, sequence diagrams, mind maps, and 16+ diagram types from simple text prompts. Our AI diagram maker delivers stunning, presentation-ready results in seconds — no design skills required.
5 free credits · No credit card required
The agent writes the diagram while you watch.
Describe the system in your own words. Drop in a PRD, a Slack thread, or a whiteboard photo. Diagram-Generator extracts the entities, infers the relationships, and writes editable Mermaid in real time. Render with your choice of GPT Image 2 or Nano Banana Pro 2.
- Context awareUnderstands system relationships, data flows, and infrastructure patterns.
- Smart refinementSay "make the database red" — no code edits required.
- Search groundedPulls live data for "current Apple supply chain" or "AWS us-east-1 outage map".
Sixteen primitives — from flowcharts to Sankeys, all in one editor.
Flowchart
Sequence
Class
State
Gantt
Timeline
Mind map
Network
ER
UML
Venn
Sankey
AWS
Lewis
Pro
Org chart
Pro
Quadrant
Pro
Funnel
ProClick any card to start creating your diagram
Stop presenting boring boxes. Start telling visual stories.
Boardroom-ready aesthetics
Eleven first-class styles — Modern Tech, Editorial, Blueprint, Hand-drawn, 3D Isometric. Each preserves your underlying logic; only the skin changes.
Real-world awareness
Pro Mode connects to live web data. Ask for "current Apple supply chain" or "AWS us-east-1 outage map" — Diagram-Generator researches, then renders.
- fetched 12 sources · 3.1s
- extracted 8 entities · suppliers, OEMs
- resolved 14 links · sourcing routes
- rendered Sankey · 4K Modern Tech
Editable Mermaid forever
Every diagram exports as Mermaid, Markdown, SVG, PNG, or PDF. Version it in Git. Drop it in your docs. Edit by code or by chat.
graph LR
Client --> API[/oauth/token]
API --> Auth[Auth Core]
Auth --> Redis[(Redis Cache)]
Auth --> 2FA{2FA Challenge}
2FA -->|verified| Audit[Audit Log]Talk to the agent
"Make the database red." "Add a fraud-check between checkout and payment." "Re-render this in Blueprint at 4K." Natural language — no panel hunting.
Logic → Graphic. Refine before you render.
Cheap iteration in Logic Mode. Spend Pro credits only when the structure is final.
Type your idea — get a structured diagram in Logic Mode.
Edit text, adjust the flow, or chat with the agent until it's right.
Hit Pro Render. Get a high-resolution, presentation-ready visual.
“I shipped a 12-step compliance flow during a meeting. The PM thought it was a Figma file.”
“Pasted my PRD, got an architecture diagram. The whole team thought I had a designer.”
“It rendered our supply chain in Sankey form with current sourcing data. I almost cried.”
AI Diagram Generator Pricing - Start Free Pay for the compute you use. No hidden fees.
- 5 Pro Credits (one-time)
- Logic Mode (1 credit each)
- All 16+ Diagram Types
- Max Resolution: 2K
- Watermark on Pro Mode
- 100 Pro Credits/month
- Max Resolution: 2K
- No Watermark
- Commercial License
- Private Gallery
- 400 Pro Credits/month
- Max Resolution: 4K
- 4K Generation (6 credits)
- Priority Support
- All Starter Features
Complete Feature Comparison
See everything that's included in each plan
| Feature | FreeDeveloper | StarterBESTBest Value | ProPower Users |
|---|---|---|---|
| Price | $0 | $9/month | $35/month |
| Creditsℹ️ | 5 (one-time) | 100/mo | 400/mo |
| 1K Generationℹ️ | 1 credit | 1 credit | 1 credit |
| 2K Generationℹ️ | 3 credits | 3 credits | 3 credits |
| 4K Generationℹ️ | — | — | 6 credits |
| Logic Modeℹ️ | 1 credit each | 1 credit each | 1 credit each |
| DGAI Agentℹ️ | — | 1 credit/query | 1 credit/query |
| AI Text/ASCII Diagrams | |||
| Editable Mermaid Code | |||
| Max Resolutionℹ️ | 2K | 2K | 4K |
| Watermarkℹ️ | Yes | No | No |
| Ownershipℹ️ | Diagram-Generator | You | You |
| Galleryℹ️ | Public | Private | Private |
| Commercial Licenseℹ️ | |||
| Diagram Typesℹ️ | All 16+ | All 16+ | All 16+ |
| Diagram Stylesℹ️ | All 10+ | All 10+ | All 10+ |
| Supportℹ️ | Community | Standard | Priority |
Frequently Asked Questions know.
Everything you need to know about Diagram-Generator.
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