System Design Diagram Builder
Build system architecture diagrams with drag-and-drop components. Add servers, databases, load balancers, caches, CDNs, queues, and connect them visually.
Click a component above to add it to the canvas
Click a component to add it. Select a node and click "Connect" to draw edges. Double-click labels to rename. Click edges to add labels.
How to Use This Tool
- Step 1Add Components
Click toolbar buttons to add nodes: Client, CDN, Load Balancer, Server, Cache, Queue, Database, or Cloud Service.
- Step 2Connect Nodes
Select a node, click Connect, then click the target node. Click edges to add labels like 'HTTP', 'gRPC', etc.
- Step 3Customize Labels
Double-click any node label to rename it. Drag nodes to rearrange your architecture layout.
- Step 4Export Your Diagram
Click Export SVG to download your diagram as a vector image. Use it in documentation, presentations, or interviews.
- •Start with the client on the left and work right: Client → CDN → Load Balancer → Servers → Database.
- •Use meaningful labels — rename 'Database' to 'PostgreSQL Primary' or 'Redis Cache' for clarity.
- •For interviews, keep diagrams simple (6-10 nodes). Focus on data flow, not exhaustive detail.
- •Click empty canvas space to deselect. Select a node to see Connect, Edit, and Delete actions.
System Design Interview Preparation
System design interviews test your ability to architect scalable, reliable distributed systems. Drawing clear diagrams is essential for communicating your design decisions.
Common components: Load balancers distribute traffic, CDNs cache static content at edge locations, application servers handle business logic, caches (Redis/Memcached) reduce database load, message queues (Kafka/RabbitMQ) decouple services, and databases store persistent data.
Practice designing systems like URL shorteners, chat applications, news feeds, ride-sharing platforms, and payment systems. Use this tool to sketch your architecture before, during, or after interviews.