Draw.io
Free, open-source diagramming tool for creating flowcharts, wireframes, system architectures, and UML diagrams directly in your browser.
Updated on February 1, 2026
Draw.io (also known as diagrams.net) is an open-source web application for creating professional diagrams without installation. Used by UX designers, developers, and software architects, this tool offers a comprehensive library of shapes and templates to visualize processes, user interfaces, and technical architectures. Its free and accessible nature makes it a reference for visual project documentation.
Fundamentals
- Completely free web application running in the browser with no mandatory account
- Extensive shape library: UML, BPMN, wireframes, flowcharts, network and cloud architectures
- Multi-platform support with local, Google Drive, OneDrive, GitHub, or Confluence storage
- Export to numerous formats: PNG, SVG, PDF, HTML, XML for easy documentation integration
Benefits
- No licensing costs: 100% free solution even for commercial use
- Data privacy: runs locally in browser, no data sent to remote servers
- Simplified collaboration via integration with Confluence, Google Drive, and GitHub for versioning
- Intuitive drag-and-drop interface accessible to non-designers
- Specialized libraries for AWS, Azure, GCP, Kubernetes, and cloud infrastructures
Practical Example
Typical use case: creating a system architecture diagram to document a microservices application. The team uses Draw.io to visually represent APIs, databases, message queues, and external services, facilitating overall system understanding for new developers and non-technical stakeholders.
<!-- Embedding a Draw.io diagram in an HTML page -->
<iframe
frameborder="0"
style="width:100%;height:600px;"
src="https://viewer.diagrams.net/?highlight=0000ff&edit=_blank&layers=1&nav=1&title=architecture.drawio#Uhttps%3A%2F%2Fdrive.google.com%2Fuc%3Fid%3D1234..."
></iframe>
<!-- Programmatic export via API -->
<script>
// Draw.io can be integrated as a web component
const diagramEditor = new DrawioEditor({
element: document.getElementById('diagram'),
xml: loadedDiagramXML,
autosave: true
});
</script>Implementation
- Access app.diagrams.net (no registration required) or download the desktop application
- Select a storage location: local device, Google Drive, GitHub, or other
- Choose an appropriate template (wireframe, UML, cloud architecture, flowchart) or start with a blank canvas
- Use the shape library with drag-and-drop to build the diagram
- Configure connectors and relationships between elements using automatic linking tools
- Customize styles, colors, and typography according to project visual guidelines
- Export to desired format (SVG for web, PNG for presentations, PDF for documentation)
- Integrate into Confluence, Notion, or technical documentation via embed or attached file
Pro tip
Use Draw.io layers to manage different views of the same architecture: overview, detailed service view, network view. This allows presenting the right complexity level according to audience (technical vs. business) while maintaining a single source file. Also consider versioning your diagrams on GitHub to track architecture evolution over time.
Related Tools
- Figma: for high-fidelity wireframes and interactive prototypes
- Miro: for collaborative workshops and visual brainstorming
- Lucidchart: SaaS alternative with real-time collaboration
- PlantUML: for generating UML diagrams from text code
- Mermaid.js: for creating diagrams via Markdown syntax
- Confluence: documentation platform with native Draw.io integration
Draw.io represents an ideal solution for teams seeking to visually document their projects without financial investment. Its flexibility, absence of vendor lock-in, and respect for data privacy make it a strategic choice for organizations valuing digital sovereignty and transparency. By standardizing on this tool, teams reduce licensing costs while maintaining professional quality in their technical documentation and design deliverables.
