12 Free 3D Tools — Viewers, Converters & Models
Browser-based 3D model viewers, format converters, and spatial utilities. No signup required.
3D Viewing & Inspection (12)
3D Model Viewer (GLTF/OBJ/STL)
Load and rotate GLTF, OBJ, or STL files in your browser
GLTF Inspector
Parse a GLTF/GLB file and explore its JSON structure
OBJ Inspector
Inspect OBJ geometry, groups, and materials
STL Viewer
View binary or ASCII STL meshes in 3D
FBX Viewer (via conversion)
View FBX models after converting to GLTF
3D Mesh Stats Tool
Vertex, face, edge, and material counts for any mesh
3D Scene Explorer
Walk the scene graph of any 3D file
3D Bounding Box Inspector
Compute and visualize bounding box dimensions
3D Normal Map Viewer
Preview a normal map applied to a sphere
UV Map Inspector
Render the UV layout of a 3D model
3D Wireframe Viewer
Toggle wireframe rendering for any model
3D Vertex Count Analyzer
Per-mesh vertex counts for performance budgeting
3D Modeling Utilities (14)
3D Model Scale Calculator
Calculate scaling factors between units
3D Print Volume Estimator
Estimate the printable volume of a model
Mesh Simplification Preview
Preview decimated meshes
3D Booleans Concept Tool
Plan boolean operations between meshes
Surface Area Calculator (3D)
Compute surface area of a mesh
3D Model Unit Converter
Convert between mm, cm, inch, m
Voxel Art Builder
Build voxel-based scenes
3D Isometric Builder
Compose isometric scenes in browser
Mesh Smoothing Viewer
Preview subdivision surfaces
3D Mirror/Symmetry Tool
Preview mirrored geometries
Model Hollower (Shell) Concept
Plan wall thickness for hollowing
3D Pivot Point Adjuster
Re-center model origins
Poly Count Reducer Helper
Target poly counts for LODs
3D Model Bounding Sphere Calc
Calculate bounding spheres
3D Print Preparation (12)
G-Code Viewer
Preview G-Code paths layer by layer
3D Print Time Estimator
Estimate print time from parameters
Overhang Angle Checker
Identify faces needing supports
Wall Thickness Analyzer
Check minimum wall thickness
Support Material Estimator
Estimate support material usage
Infill Density Visualizer
Visualize different infill patterns
Bed Leveling Test Generator
Generate bed leveling test prints
3D Print Shrinkage Calculator
Calculate material shrinkage compensation
Resin Exposure Time Finder
Calculate ideal resin exposure
FEP Film Tension Guide
Guide to tuning FEP film
Nozzle Size vs Layer Height
Calculate optimal layer heights
Extrusion Multiplier Calc
Calibrate flow rate/extrusion
FDM 3D Printing (10)
Filament Spool Cost Calculator
Cost per gram/meter of filament
Filament Runout Predictor
Predict if a spool has enough left
Retraction Calibration Test
Generate stringing tests
Temperature Tower Generator
Generate temp tower STLs
Vase Mode Planner
Plan continuous spiral vases
First Layer Squish Visualizer
First layer height reference
PID Autotune Helper
Marlin PID autotune reference
Stepper Motor Steps/mm Calc
Calibrate e-steps and axis steps
Print Speed vs Quality Guide
Speed and acceleration reference
Dual Extrusion Prime Tower Calc
Size prime towers
SLA & Resin Printing (8)
Resin Cost Calculator
Cost per mL of resin
Resin Lift Speed Reference
Optimal lift speeds for SLA
Hollowing Resin Drain Planner
Plan drain holes for hollow prints
Resin Print Orientation Guide
Guide to minimizing peel forces
Anti-Aliasing Preview
Preview AA settings for resin
LCD Screen Life Tracker
Track hours on SLA screens
Resin Toxicity & Safety Ref
Material safety guide
Wash & Cure Time Guide
Optimal washing and curing times
Print Materials & Costs (6)
PLA vs PETG vs ABS Guide
Compare common FDM filaments
TPU/Flexible Print Settings
Reference for printing flexibles
Nylon & PC Enclosure Ref
Requirements for engineering materials
3D Print Pricing Calculator
Quote jobs by time, weight, and wear
Electricity Cost of Printing
Calculate power usage of printers
Spool Weight Tare Database
Empty spool weights by brand
3D Texturing & Materials (10)
PBR Material Viewer
View physically based materials
Albedo/Color Map Viewer
View base color maps
Roughness/Gloss Map Viewer
View roughness maps
Metalness Map Viewer
View metallic maps
Ambient Occlusion Viewer
View AO maps
Displacement Map Visualizer
Preview height/displacement
Texture Tiling Checker
Check for seamless tiling
Normal Map Inverter (DirectX/OpenGL)
Flip green channels on normals
Texture Resolution Resizer
Scale textures to power-of-two
Color Palette to 3D Gradient
Map palettes to 3D ramps
3D Animation (Concept Tools) (8)
Bone Weight Visualizer
Preview vertex weights
Rigging Hierarchy Viewer
View armature tree structures
Keyframe Interpolation Curve
Bezier curve editor for animation
FK/IK Joint Simulator
Simulate forward and inverse kinematics
Motion Capture Data Viewer
Preview BVH files
Frame Rate Converter
Calculate frame counts across FPS
Lip Sync Viseme Reference
Reference chart for mouth shapes
Walk Cycle Timing Guide
Timing charts for standard walk cycles
Web 3D & Real-Time (10)
Three.js Scene Builder
Compose basic Three.js scenes
WebGL Capabilities Checker
Check device WebGL limits
HDRI Environment Viewer
View equirectangular HDRI maps
GLTF Compression (Draco) Planner
Estimate Draco compression savings
Three.js Camera Planner
Plan FOV and near/far planes
WebXR Device Support Checker
Check for VR/AR support
Three.js Geometry Gallery
Gallery of geometries
WebGPU Feature Checker
Check WebGPU support
Three.js Material Preview
Preview Three.js materials
3D Performance Budget Estimator
Budget polys and draw calls
Print Design (Print-on-Paper) (14)
Print Bleed & Safe Zone Calculator
Bleed and safe zones for print
Print DPI Checker
Check image DPI for print
CMYK Print Preview Simulator
Preview CMYK output
Print Template Builder
Build print templates
Tiling Print Layout
Lay out tiled prints
Large Format Print Calculator
Calculate large format prints
Print Crop Marks Generator
Generate crop marks
Color Bar Reference
Reference color bars
Registration Mark Generator
Generate registration marks
Print Proof Checklist
Pre-press proof checklist
Printer Color Profile Selector
Pick the right ICC profile
Cardstock Weight Reference
Paper weight reference
Binding Type Selector
Pick a binding method
Print Run Cost Estimator
Estimate print run cost
Specialized 3D (10)
Point Cloud Viewer
View point clouds
Photogrammetry Checklist
Photogrammetry workflow checklist
LiDAR Data Reference
LiDAR data reference
3D Scanning Guide
Guide to 3D scanning
Digital Fabrication Reference
Digital fab reference
CNC Path Concept Planner
Plan CNC toolpaths
Laser Cutter Material Guide
Materials for laser cutting
Embossing Pattern Builder
Build emboss patterns
3D Map Terrain Viewer
View 3D terrain maps
Procedural Terrain Generator
Generate procedural terrain