Just3D - 3D Model Viewer & Converter

About

View, Convert, and Create 3D Models - All in Your Browser

Just3D is a powerful, privacy-focused 3D model viewer and converter that works completely offline. View, convert, and even create 3D models without installing heavy software or uploading files to external servers.

I've built it to assist me in indie game development and hope you also find it useful!

✨ KEY FEATURES

🎨 Universal 3D Viewer
• Support for 8 popular formats: STL, GLB, OBJ and more;
• Import from URLs: Paste any link to a 3D model and load instantly
• Right-click context menu: Open 3D model links directly from web pages
• GitHub integration: Auto-converts GitHub URLs to raw content
• Smooth interactive controls with mouse and keyboard
• Customizable display: wireframe mode, grid, axes, lighting
• Multiple camera presets (front, back, top, isometric, etc.)
• Real-time model information (vertices, faces, dimensions)
• Multiple models in one scene

🔄 Format Converter
• Convert between several widely used 3D formats
• Optimized for common workflows such as 3D printing, game development, and web graphics
• Export models in web-friendly and production-ready formats
• No file size limits — conversion happens locally in your browser

🎯 Creator Mode - Build 3D Objects from Scratch
• Create simple 3D objects without external tools:
• Built-in primitive shapes
• Transform tools for moving, rotating, and scaling objects
• Adjustable material properties, including textures application
• Scene management with multiple objects
• Export your created models for further use

🔒 Privacy & Security
• 100% local processing - no upload servers
• Your models never leave your computer
• User-initiated URL fetching only (when you provide a link or right-click)
• No data collection or tracking
• Works offline for local files
• Open source architecture for transparency

⚡ Performance
• Fast rendering with Three.js and WebGL
• Hardware-accelerated 3D graphics
• Optimized for large models
• Responsive interface with smooth animations
• Handles complex geometries efficiently

🌍 Use Cases
• 3D Printing: View and convert STL files
• Game Development: Quick model previews from GitHub repos
• Architecture: Visualize building models
• Education: Study 3D geometry, share models via URLs
• Prototyping: Create simple 3D objects
• Format Conversion: Batch convert models
• Web Development: Optimize models for web (GLTF)
• Online Repositories: Browse and open models from web pages with right-click

🎓 Perfect For
• 3D printing enthusiasts
• Game developers
• 3D artists and designers
• Architects and engineers
• Students and educators
• Web developers
• Hobbyists and makers

📐 Measurement & Annotation Tools
• Measure distances between points in 3D space
• View object dimensions (width, height, depth)
• Add persistent measurements to your models

🌍 Common Use Cases
• Previewing 3D models from local files or public URLs
• Inspecting assets from online repositories
• Preparing models for 3D printing
• Quick asset checks during game or web development
• Educational exploration of 3D geometry
• Creating simple objects and exporting them for further work

🚀 Why Choose Just3D?

Unlike cloud-based viewers:
✓ Complete privacy - files stay on your device
✓ Works offline for local files
✓ No file size limits
✓ No upload wait times
✓ User-initiated URL fetching (no background tracking)
✓ Free and open source

Unlike desktop software:
✓ No installation required
✓ Lightweight and fast
✓ Access from any Chrome browser
✓ Automatic updates
✓ Cross-platform compatibility
✓ Convenient URL import and right-click loading

📝 🚀 Get Started
• Click the Just3D extension icon
• Open a local 3D file or load a model from a public URL
• Explore, inspect, or create objects
• Convert or export when needed

🆘 Support & Community
• Open-source project
• Public issue tracker for bugs and feature requests
• Regular updates and improvements

GitHub repository:
https://github.com/MrSidims/Just3D

Support the developer:
https://buymeacoffee.com/justanotherdev

⭐ Try Just3D Today!
Experience the freedom of viewing and converting 3D models directly in your browser. No accounts, no uploads, no limitations - just pure 3D functionality at your fingertips.

Perfect for anyone working with 3D models who values privacy, speed, and simplicity.