What is DiagramPreview
DiagramPreview is an online diagram preview, conversion, and AI-powered generation tool for developers. It supports previewing and converting Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io, mind maps, JSON, YAML, and other developer diagrams in a single browser workspace.
How to use DiagramPreview
- Navigate to any tool page (e.g., AI Diagram Generator, Mermaid Preview, PlantUML Preview).
- Enter or paste your diagram code (e.g., Mermaid syntax, PlantUML code, Markdown text) into the editor.
- The diagram renders in real-time in the preview pane.
- Use the workspace toolbar to export the diagram as SVG, PNG, or copy the code.
- For AI tools, describe your diagram in natural language and click generate.
Features of DiagramPreview
- AI-powered diagram generation: Generate Mermaid, PlantUML, draw.io, Grafana dashboards, Prometheus alert rules, and observability packs from natural language prompts.
- Multi-format preview: Preview Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io, mind maps, JSON, YAML, and more.
- Diagram conversion: Convert between formats (e.g., PlantUML to Draw.io, Mermaid to Draw.io, Draw.io to SVG).
- Developer-focused tools: Visualize Kubernetes manifests, Docker Compose, Terraform, GitHub Actions, OpenAPI specs, and more.
- Data and schema visualizers: Inspect JSON Schema, GraphQL schemas, TypeScript interfaces, Protobuf, and database schemas.
- Browser-first rendering: Most rendering runs locally in the browser for fast drafts.
- Export options: Export diagrams as SVG, PNG, or copy to clipboard.
- No signup required: All tools are free to use without registration.
Use Cases of DiagramPreview
- Documentation: Preview and export Mermaid or PlantUML diagrams for technical documentation.
- Architecture design: Generate architecture diagrams from product notes or system descriptions using AI.
- API debugging: Convert OpenAPI specs, Postman collections, or HAR files into sequence diagrams.
- DevOps workflows: Visualize Kubernetes manifests, Docker Compose files, Terraform resources, and CI/CD pipelines.
- Data inspection: Preview JSON, YAML, TOML, and CSV files as tree diagrams.
- Schema analysis: Visualize JSON Schema, GraphQL schemas, and database schemas.
Pricing
DiagramPreview is free to use with no signup required. All tools are accessible without payment.
FAQ
What can DiagramPreview render?
The first release focuses on Mermaid, PlantUML, Markdown, Graphviz, JSON, YAML, and structured preview pages for the remaining diagram formats.
Do diagrams upload to a server?
Browser-first tools render locally when possible. PlantUML uses a server URL in the first version so the renderer can be replaced later.
Can I export diagrams?
Supported renderers expose SVG, PNG, copy, and print-style PDF actions from the workspace toolbar.
