Is text2diagram really free?

Yes. Quick mode supports every diagram type without signup, watermark, or credit card. Chat mode is also free but requires sign-in so it can keep conversation context. Both modes have a generous daily rate limit that resets every 24 hours.

What diagram types does the AI generator support?

Seven diagram types: flowchart, sequence diagram, ERD (entity-relationship diagram), class diagram, state diagram, mindmap, and Gantt chart. The first six are rendered with Mermaid; mindmaps are rendered with markmap for interactive folding and OPML export. Auto-detect picks the right type from your prompt, or you can pin it with the diagram type picker.

Do I need to know Mermaid syntax?

No. You write in plain English (or Chinese). The AI generates valid Mermaid source behind the scenes, but you never need to touch it unless you want to. If you do know Mermaid, the split view lets you edit the source directly and see the change render live — good for last-mile tweaks.

What is the difference between Quick mode and Chat mode?

Quick mode generates a diagram from one prompt — fastest, best for straightforward flows. Chat mode lets AI ask 2-3 clarifying questions about actors, events, and edge cases before drawing — better when you're not sure of every detail. You can switch between tabs at any time and keep the same diagram type selection.

How many questions does Chat mode ask before drawing?

Typically 2-3, sometimes 4-5 for complex flows. There's a built-in budget so it will not ask forever. Once AI has enough context, it produces the diagram and shows any assumptions it made — you can reject any of them in one click.

Can I skip the questions and just generate?

Yes. In Chat mode, type 'just draw it' or 'skip questions' to jump straight to generation. AI will use whatever context it has and note its assumptions. If any assumption looks wrong, reject it and the diagram redraws.

What if AI adds elements I did not ask for?

After Chat mode generates a diagram, it shows a confirmation card listing anything it inferred — a return arrow you did not describe, an actor you did not mention. Click 'Reject' and the AI redraws without that element. Click 'Accept' and it's added to the diagram spec for the next iteration.

Can I edit the generated diagram?

Yes, in two ways. First, edit the underlying Mermaid source in the split view — every change re-renders in the preview instantly. Second, rerun the prompt with more detail, or add a follow-up sentence, and the AI regenerates the diagram from the new description. Mindmaps have a dedicated markdown editor with the same split behavior.

How do I export the diagram?

Every diagram type exports as SVG (lossless, scales to any size) and PNG (raster, drop into slides and docs). Mindmaps additionally export as Markdown and OPML — OPML imports cleanly into XMind, Obsidian, and most outline tools. Export buttons live in the preview status bar.

Does it support Chinese input?

Yes. Type your prompt in Chinese and the generator returns a Chinese-labeled diagram. Language is passed through the entire pipeline — from the UI locale, into the API request body, into the LLM directive — so the model does not default back to English on you. Mixed Chinese-English prompts also work.

Is there a rate limit?

Yes. A daily per-IP limit caps generation requests to keep the free tier sustainable. The exact number is generous enough that normal drafting will not hit it. If you do hit the limit, the UI shows the remaining reset time. The rate limit is enforced with Upstash Redis and is consistent across all Vercel edge instances.

Is my prompt data stored?

Quick mode prompts and generated code are not stored in our application database, though they may exist briefly in in-memory caches and are sent to a third-party large language model for generation. Chat mode stores messages, AI replies, diagram specifications, and generated code under your signed-in account so multi-turn context works. Production logs omit prompt content. See the privacy page for retention and deletion details.

text2diagramAI

Tutorials

Templates

Flowchart

8 fully-branched process flows — open one and edit

Sequence diagram

8 interaction flows, responses and all

Class diagram

8 ready-made class diagrams — open one and edit

ER diagram

8 keyed database schemas with cardinality

TypesDiagram types

Text to Flowchart AI

Describe a process in plain English. Get a diagram. Export SVG or PNG.

Sequence Diagram

Turn an API description into a sequence diagram with actors and arrows.

ERD

Describe entities and relationships. Get a Mermaid ERD with keys and cardinality.

State Diagram

Describe a state machine. Get a Mermaid state diagram with transitions.

UML Class Diagram

Describe classes, attributes, and inheritance. Get a Mermaid UML class diagram.

Text to Mind Map

Describe a topic hierarchy. Get a Mermaid mindmap with nested branches.

Gantt Chart

Describe project phases and dependencies. Get a Mermaid Gantt chart.

Chat to Diagram

Chat with AI to draw diagrams — no syntax, no guessing at the details.

Architecture Diagram

Describe your system's components and how they talk to each other. Get a layered architecture diagram.

UML Diagram

Describe your design. The AI figures out whether it's a class, sequence, or state diagram.

Diagram

Describe anything in plain text. Get the diagram type that fits — no need to know which one you want first.

Diagram from Code

Paste a code snippet. Get a class diagram, flowchart, or architecture diagram back.

Diagram from JSON

Paste JSON — an API response, a schema, a document sample. Get an ERD or class diagram back.

ChatGPT Mermaid Fixer

ChatGPT writes the Mermaid. This draws it — paste, fix the syntax, edit, export.

EN 中文

AI diagram generator with two modes: Quick (one prompt, no signup) or Chat (multi-turn, AI clarifies before drawing). Edit and export SVG / PNG / Markdown.

AI Diagram Generator — from Prompt or Chat

Describe itPlain English. No diagram syntax, no type to pick first.
Get the diagramEditable code on the left, live preview on the right — tweak either.
ExportSVG, PNG, or copy the Mermaid code into your docs.

How the AI diagram generator works

1. Describe your diagram — one sentence or a chat

Write what you want in one or two sentences — a login flow with 2FA, a database schema for a blog, a product launch mindmap. Or switch to Chat mode and let AI ask a few clarifying questions first. English works. Chinese works. You do not need to know Mermaid, PlantUML, or Graphviz syntax.

2. AI clarifies intent — then picks the right diagram type

In Quick mode, auto-detect classifies your prompt into flowchart, sequence diagram, ERD, class diagram, state diagram, mindmap, or Gantt in about 300ms. In Chat mode, AI asks 2-3 questions to firm up actors, events, and edge cases before picking a type — better for complex flows.

3. Get a rendered diagram — review and adjust

The AI returns valid Mermaid or markmap source, the preview canvas renders it live. In Chat mode, if AI made an assumption you disagree with, reject it in one click and the diagram redraws without that element. Zoom, pan, and reset view work on desktop and mobile.

4. Edit and export

Open the split view to tweak the generated Mermaid source directly. Every edit re-renders instantly. Export as SVG for lossless scaling, PNG for slides and docs, Markdown or OPML for mindmaps you want to import into XMind or Obsidian.

What people use the diagram generator for

The AI diagram generator covers the seven diagram types most engineers, PMs, and technical writers reach for every week. Pick Quick mode for one-shot generation, or Chat mode when you want AI to ask questions before drawing. Each use case links to a focused landing page with its own examples and prompts.

Frequently asked questions

Common questions about the AI diagram generator. Quick mode has no signup wall; Chat mode requires sign-in so it can keep the conversation context.

Is text2diagram really free?
Yes. Quick mode supports every diagram type without signup, watermark, or credit card. Chat mode is also free but requires sign-in so it can keep conversation context. Both modes have a generous daily rate limit that resets every 24 hours.
What diagram types does the AI generator support?
Seven diagram types: flowchart, sequence diagram, ERD (entity-relationship diagram), class diagram, state diagram, mindmap, and Gantt chart. The first six are rendered with Mermaid; mindmaps are rendered with markmap for interactive folding and OPML export. Auto-detect picks the right type from your prompt, or you can pin it with the diagram type picker.
Do I need to know Mermaid syntax?
No. You write in plain English (or Chinese). The AI generates valid Mermaid source behind the scenes, but you never need to touch it unless you want to. If you do know Mermaid, the split view lets you edit the source directly and see the change render live — good for last-mile tweaks.
What is the difference between Quick mode and Chat mode?
Quick mode generates a diagram from one prompt — fastest, best for straightforward flows. Chat mode lets AI ask 2-3 clarifying questions about actors, events, and edge cases before drawing — better when you're not sure of every detail. You can switch between tabs at any time and keep the same diagram type selection.
How many questions does Chat mode ask before drawing?
Typically 2-3, sometimes 4-5 for complex flows. There's a built-in budget so it will not ask forever. Once AI has enough context, it produces the diagram and shows any assumptions it made — you can reject any of them in one click.
Can I skip the questions and just generate?
Yes. In Chat mode, type 'just draw it' or 'skip questions' to jump straight to generation. AI will use whatever context it has and note its assumptions. If any assumption looks wrong, reject it and the diagram redraws.
What if AI adds elements I did not ask for?
After Chat mode generates a diagram, it shows a confirmation card listing anything it inferred — a return arrow you did not describe, an actor you did not mention. Click 'Reject' and the AI redraws without that element. Click 'Accept' and it's added to the diagram spec for the next iteration.
Can I edit the generated diagram?
Yes, in two ways. First, edit the underlying Mermaid source in the split view — every change re-renders in the preview instantly. Second, rerun the prompt with more detail, or add a follow-up sentence, and the AI regenerates the diagram from the new description. Mindmaps have a dedicated markdown editor with the same split behavior.
How do I export the diagram?
Every diagram type exports as SVG (lossless, scales to any size) and PNG (raster, drop into slides and docs). Mindmaps additionally export as Markdown and OPML — OPML imports cleanly into XMind, Obsidian, and most outline tools. Export buttons live in the preview status bar.
Does it support Chinese input?
Yes. Type your prompt in Chinese and the generator returns a Chinese-labeled diagram. Language is passed through the entire pipeline — from the UI locale, into the API request body, into the LLM directive — so the model does not default back to English on you. Mixed Chinese-English prompts also work.
Is there a rate limit?
Yes. A daily per-IP limit caps generation requests to keep the free tier sustainable. The exact number is generous enough that normal drafting will not hit it. If you do hit the limit, the UI shows the remaining reset time. The rate limit is enforced with Upstash Redis and is consistent across all Vercel edge instances.
Is my prompt data stored?
Quick mode prompts and generated code are not stored in our application database, though they may exist briefly in in-memory caches and are sent to a third-party large language model for generation. Chat mode stores messages, AI replies, diagram specifications, and generated code under your signed-in account so multi-turn context works. Production logs omit prompt content. See the privacy page for retention and deletion details.

AI Diagram Generator — from Prompt or Chat

How the AI diagram generator works

1. Describe your diagram — one sentence or a chat

2. AI clarifies intent — then picks the right diagram type

3. Get a rendered diagram — review and adjust

4. Edit and export

What people use the diagram generator for

Flowcharts from plain English

Sequence diagrams for API interactions

ERD for database schema design

Mindmaps for planning and study notes

State diagrams for lifecycle modeling

Class diagrams for OO design

Gantt charts for project timelines

Frequently asked questions