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Text to Diagram Editor

Create flowcharts, sequence diagrams, and ER models with Mermaid. Zero server uploads.

Text to Diagram Editor

Create flowcharts, sequence diagrams, and ER models with Mermaid. Zero server uploads.

How It Works

1
Enter Values & Parameters
Fill in your numbers, rates, or inputs into the calculation form.
2
Review Instant Calculations
Calculations update dynamically in your browser with instant client-side performance.
3
Inspect Breakdown & Summary
Review the detailed breakdown, comparison metrics, or financial summary.

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Text to Diagram Editor: Client-Side Flowchart, Sequence & ER Modeling with Mermaid

Creating visual technical schematics, software architecture diagrams, and database entity relationships traditionally requires cumbersome drag-and-drop vector editors or cloud-based software that exposes proprietary intellectual property. The Text to Diagram Editor transforms declarative, human-readable text into publication-ready vector graphics directly in your browser using the official Mermaid.js syntax engine.

You can rapidly draft Flowcharts (decision workflows, branch logic, subgraphs), Sequence Diagrams (actor interactions, asynchronous messages, activation lifespans, loops), Entity-Relationship Diagrams (ER) (database tables, primary/foreign keys, cardinality), Class Diagrams (object-oriented hierarchies, interface methods), and State Machines without touching an external design tool. The editor features real-time debounced preview rendering, live line/character metrics, interactive pan-and-zoom controls (with mouse drag, touch pinch, and keyboard shortcuts), and syntax error diagnostics that pin the exact line number of compilation issues.

All diagram compilation and graphics synthesis execute 100% locally inside your device memory. Operating under a strict client-side sandbox policy, external scripts, HTML labels, click event callbacks, and remote image URLs are stripped by default, ensuring that confidential software architectures, patent schematics, and private database models never leak to external servers. Finished diagrams can be exported as infinitely scalable vector SVG files or high-resolution raster PNG images (with 1×, 2× Retina, or 3× print scale and custom transparent/light/dark backgrounds).

Core Architecture & Mathematical Formula

Diagram Pipeline = Parse(Mermaid DSL) → AST Validation → SVG Synthesis(D3/Dagre Layout) → Strict Sanitize(DOMPurify) → Rasterize(Canvas 2×/3×) → Vector/Raster Export

Declarative text is parsed into a structured AST, positioned using deterministic graph layout algorithms, sanitized to neutralize active scripts, and rendered into scalable SVG/PNG assets.

Best Practices & Essential Guidelines

  • Use Semantic Direction Indicators: Direct flowchart hierarchies using graph TD (top-down) for deep sequential decision trees or graph LR (left-to-right) for horizontal pipelines.
  • Rely on Strict Security Sandbox: Keep HTML labels and callbacks disabled to guarantee that user-generated or shared diagram snippets cannot trigger cross-site scripting (XSS).
  • Leverage 2× High-DPI for Presentations: When exporting PNG files for technical documentation or high-resolution displays, select the 2× (300 DPI equivalent) scaling preset to eliminate pixelation.
  • Export SVG for Infinitely Scalable Vector Quality: Choose SVG export when embedding schematics into responsive web applications, GitHub READMEs, or vector publishing suites.

Frequently Asked Questions (FAQ)

What diagram types are supported by the Mermaid editor?
The editor supports flowcharts (TD/LR/BT/RL), sequence diagrams (with actor Lifelines and autonumbering), entity-relationship (ER) models (with Crow's Foot cardinality and typed attributes), class diagrams, and state machine diagrams.
Are my proprietary system architectures or database schemas uploaded to any server?
No. The entire Mermaid parsing and rendering pipeline executes 100% locally in your browser's JavaScript runtime. Zero bytes of diagram text or generated images are ever transmitted over the network.
How does the editor protect against Cross-Site Scripting (XSS) and remote script injection?
The engine enforces strict securityLevel parameters: HTML labels are disabled by default, and click callbacks and remote script tags are neutralized and stripped before rendering.
Can I export transparent PNGs or dark mode diagrams?
Yes. The PNG export drawer allows you to select between transparent alpha backgrounds, clean white backgrounds, and dark slate backgrounds, with resolution scale options from 1× to 3×.