About FreePDFly UML
Building high-performance, private, zero-friction developer tools for everyone.
Why FreePDFly UML Exists
Software diagramming should be instantaneous. When engineers want to quickly communicate a system architecture, design an entity schema, or draft a sequence flow, they shouldn't be forced to install bulky desktop apps, configure licensing keys, or create cloud accounts.
FreePDFly UML was created to offer a focused, fast, and completely free UML diagramming application that runs directly in any modern browser.
Core Principles
1. Fast & Free
Zero subscriptions, zero paywalls, and zero waiting. Open the URL and begin diagramming immediately.
2. Local-First
Your diagrams stay on your hardware. Project data is saved to browser IndexedDB without sending code schemas over the wire.
3. Clean Exports
Export high-resolution PNG, vector SVG, and A4/Letter PDF diagrams ready for documentation and presentations.