STL 3D File Viewer

STL 3D File Viewer is a powerful and easy-to-use 3D model viewer designed for engineers, designers, 3D printing enthusiasts, and anyone who works with 3D files. Open and inspect your 3D models directly on your Android device with high-performance OpenGL ES 3.0 rendering.

Supported File Formats:
• STL (Binary & ASCII)
• OBJ (Wavefront)
• DXF (AutoCAD 3DFACE)
• GLTF / GLB (Version 2.0)

Rendering & Display:
• Solid, wireframe, and x-ray transparent rendering modes
• Multi-light system with 4 adjustable lights for realistic shading
• 6 gradient background presets for professional presentations
• Perspective and orthographic camera projection
• Smooth animated camera transitions
• 7 preset viewpoints plus custom saved views
• XYZ axis gizmo for orientation reference
• 10 model color presets

Measurement & Analysis Tools:
• Distance measurement between two points
• Angle measurement from three points
• Face selection with area and normal vector display
• Real-time bounding box dimensions (W x H x D)
• Comprehensive model information: vertices, triangles, surface area, volume

3D Print Preparation:
• Watertight mesh analysis
• Non-manifold edge detection
• Degenerate triangle identification
• Open edge detection
• Mesh repair tools: remove degenerate triangles, recalculate normals, flip normals
• Mesh decimation to reduce file size

Export & Sharing:
• Export as STL Binary, STL ASCII, or OBJ format
• PDF export with screenshot, dimensions, and model statistics
• Share models directly from the app
• Screenshot capture and gallery save

Advanced Features:
• Section planes on X, Y, and Z axes with cross-section highlighting
• Boolean operations: union, subtract, intersect
• Batch loading for viewing multiple models side by side
• GLTF texture support and animation playback
• Unit conversion between mm, cm, m, inches, and feet
• 3D text annotations

Modern Design:
• Material Design 3 dark theme interface
• Intuitive multi-touch controls: rotate, zoom, pan
• Recent files list for quick access
• Supports opening files from other apps and file managers

STL 3D File Viewer gives you a complete 3D model inspection toolkit right in your pocket. Whether you need to check a model before 3D printing, review a CAD design on the go, or share model details with your team, this app has you covered.