FreeNo sign-upCode never uploadedPNG download

Text to Mermaid Diagram Maker

Paste Mermaid code — a flowchart, sequence diagram, ER diagram — and see it rendered instantly. Download a crisp PNG for your docs, README or slides. No sign-up, and your code never leaves your browser.

Rendering your Mermaid code…

The demo above is live — edit the code and hit Generate. The example that loads with the page is free; each Generate click uses one of your 10 free generations per day.

How it works

From Mermaid code to a finished diagram in four steps.

1

Paste your code

Any Mermaid syntax, starting with a keyword like “flowchart TD” or “sequenceDiagram”.

2

Pick “Mermaid diagram”

The visual type is pre-selected on this page.

3

Hit Generate

Your diagram is drawn instantly in your browser.

4

Download PNG

One click, no watermark — ready for docs, READMEs or slides.

Supported Mermaid diagram types

Everything the Mermaid library renders — paste it as-is.

flowchart

Flowcharts

Processes, decision points and branches — the classic “flowchart TD”.

sequenceDiagram

Sequence diagrams

Requests and responses between users, services and APIs.

classDiagram

Class diagrams

Classes, interfaces and relationships for OOP design.

stateDiagram

State diagrams

States and transitions — order flows, auth flows, machines.

erDiagram

ER diagrams

Database entities and how they relate.

and more

Gantt, pie, mindmap…

Also gantt, pie, journey, mindmap, timeline, gitGraph and quadrant charts.

Private by design: your code never leaves your browser

Architecture and schema diagrams are often internal. Text2Viz renders them locally, so nothing is uploaded.

Privacy

No sign-up, no account

There is nothing to create and nothing to log into. Open the page and start rendering.

Privacy

Rendered locally

Your diagram is drawn by JavaScript running on your own device. Your code is never sent to our servers.

Privacy

Safe for internal docs

System designs, database schemas, on-call runbooks — if you would not email it, you can still render it here.

What people make with it

Three common ways people use this free Mermaid renderer.

Use case

From AI chat to image

ChatGPT or Claude gave you a Mermaid code block? Paste it here and turn it into a shareable PNG.

Use case

READMEs and docs

Render the same Mermaid source you keep in your repo into an image for wikis and tickets.

Use case

Study and specs

Turn sequence and ER sketches into clean diagrams for assignments and design docs.

Frequently asked questions

Is this Mermaid diagram maker free?
Yes. You get 10 free diagram renders per day, every day, with PNG download and no watermark. No account, no trial that expires.
How do I turn text into a Mermaid diagram?
Paste or write Mermaid code — start with a diagram keyword like flowchart TD, sequenceDiagram, classDiagram or erDiagram — then hit Generate. The diagram renders instantly and you can download it as a PNG.
Which Mermaid diagram types are supported?
Everything the Mermaid library renders: flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, user journeys, mindmaps, timelines, git graphs and more.
Can I paste Mermaid code from ChatGPT or Claude?
Yes. AI assistants often output Mermaid code blocks — copy everything inside the block (skip the code fence lines), paste it here, and render it into an image.
Is my diagram code uploaded to your servers?
No. Rendering happens locally in your browser with JavaScript — your code is never sent to or stored on our servers.
Can I download the diagram as a PNG?
Yes. Every diagram has a Download PNG button — free, no watermark, exported at double resolution for crisp docs and slides.

Have Mermaid code? Make it a diagram.

Free, no sign-up, 10 renders a day.

Render your diagram