What does watertight mean?
A watertight (manifold) mesh requires every edge to be shared by exactly two triangles: no holes or non-manifold edges. 3D printing and Boolean operations usually require watertight meshes.
3D Model Analyzer
Load a model and instantly see vertex count, physical size, volume, and watertight status, all right in your browser.
Workspace
Drop files here
or click to browse, paste supported
About This Tool
After loading a supported 3D file, you can inspect file size, vertex and face counts, mm-accurate dimensions, volume, surface area, watertight status, mesh quality, materials, textures, and animations.
Tips
- 1Copy the full analysis report with one click
- 2Watertight means every edge is shared by exactly two triangles
- 3If the model has animations, all clips play by default
- 4Dimensions are converted when the file includes length units
How to Use
- 01
Upload a model
Drop STL, GLB, OBJ, FBX and other formats
- 02
Review the analysis panel
Expand each section to view metrics
- 03
Copy or preview animation as needed
Copy the report, or click animation clips to play a preview
Frequently Asked Questions
View all FAQsAbout this tool
Why might the dimensions be off?
When a file has no unit metadata, the tool assumes 1 unit = 1 mm. Large CAD models exported in meters will look enormous, so scale them before printing.
How does the tool handle models with animations?
The analysis panel shows the number of animation clips and plays all of them by default. You can also use the play or pause buttons to preview a single clip.
How do I copy the analysis report?
Click the copy button at the top-right of the analysis panel or next to the report title. The full report is copied to the clipboard so you can share or save it.
How can I check whether a model is ready for 3D printing?
Start with the watertight status: printing usually requires a mesh with no holes or non-manifold edges. Then verify dimensions and units (the tool treats 1 unit as 1 mm when metadata is missing), and use the volume to estimate material usage.
Why do face and vertex counts matter?
They affect file size, load time, and how demanding the mesh is for slicing or real-time rendering. The analyzer reports vertex count, face count, and an estimated memory footprint so you can spot overly dense meshes that may need decimation.
General questions
Is Any3D completely free?
Yes, Any3D's core features are free to use forever. We provide format conversion, model optimization, and online preview at no cost, with no registration required.
Are my files uploaded to your servers?
No. Files you select are processed only in your browser on this device, so they never leave your device and are never sent to our servers. We don't store any user files; after processing, related data in browser memory is released.
Do I need to install software?
No installation required. Any3D is entirely browser-based; just open the webpage to use all features. It works on Windows, Mac, Linux, and other major operating systems.
Is there a file size limit?
There is no cap on file size or polygon count. How large a model you can open depends on your device's memory and graphics card, and very heavy models may make the page lag or crash. Some tools do limit how many files go in at once, such as 20 models per batch or single images up to 50 MB in texture compression. See Limits for the full list.
About Configuration Options
Model info
File format
Extension of the uploaded file (e.g. GLB, STL, OBJ).
File size
Total size of the uploaded model file on disk.
Data footprint
Estimated GPU usage for geometry buffers plus textures (including mipmaps).
Geometry
Vertices
Number of vertices in the mesh geometry.
Triangles
Number of triangular faces in the mesh.
Size
Bounding box dimensions in millimeters along X, Y and Z.
Volume
Solid volume of the closed mesh, from tetrahedral decomposition.
Surface area
Sum of all triangle areas (square centimeters).
Watertight
Whether every edge is shared by exactly two triangles. Open meshes may have holes or non-manifold edges.
Boundary edges
Edges that belong to only one triangle, indicating holes.
Non-manifold edges
Edges shared by more than two triangles, indicating non-manifold topology.
Mesh quality
Connected components
Number of independently connected mesh parts.
Isolated vertices
Vertices not referenced by any face.
Normals
Whether vertex normals are fully present (affects lighting).
Avg. edge length
Mean length of all triangle edges in millimeters.
Triangle quality
Mean triangle shape quality; equilateral = 100%, skinny triangles score lower.
Materials & textures
Materials
Number of materials assigned to the model.
Textures
Number of texture images embedded or referenced.
Resolutions
Pixel size and format of each texture slot.
GPU memory
Estimated VRAM used by textures including mipmaps.
Animation
Clips
Number of animation clips stored in the file.
Bones
Number of skeleton bones used for rigging and skinning.
Format Information
Input format
- Extension:
- Model
- Full Name:
- 3D Model
- Type:
- 3D Model
- Format:
- Various 3D Formats
- Tools:
- Three.js、Babylon.js
- Open With:
- Windows 3D Viewer、Blender
- Description:
- Supports many 3D formats (GLB, GLTF, OBJ, FBX, STL, etc.). Drag and drop to view.
Notes:
- Supports 20+ 3D model formats
- Associate texture files (MTL, images) can be uploaded alongside the main model
- All processing is local, so files never leave your browser
Supported Features:
- Real-time GPU-accelerated rendering via WebGL
- Orbit controls: rotate, pan, zoom
- Wireframe and shaded display modes
- Model info panel with vertex/face counts
- Animation playback for animated formats