# 3D Model Viewer & Inspector Upload an STL, OBJ, GLB or glTF model: exact vertex/triangle counts, bounding-box dimensions, materials, animations and node tree, plus an interactive Three.js viewer (rotate, zoom, shaded/wireframe/normals). > Canonical page: https://elysiatools.com/en/tools/3d-model-viewer - **Category:** Media - **Keywords:** 3d viewer, stl, obj, gltf, glb, mesh inspector, three.js ## Overview Parsers run server-side without three.js: binary STL (80-byte header + uint32 count + 50 B/triangle), ASCII STL vertex scan, OBJ with n-gon fan triangulation and 1-based/negative indices, and the glTF 2.0 container (JSON + BIN chunks, accessor decoding for all component types with byteStride support). The embedded preview is capped at 80k triangles via uniform stride sampling; statistics stay exact. Draco/meshopt-compressed geometry cannot be decoded server-side and is reported as structure only. ## Inputs - **3D model file (STL / OBJ / GLB / glTF)** (file): Upload a .stl, .obj, .glb or .gltf file - **Initial render mode** (select) - **Viewer background** (select) - **Auto-rotate** (checkbox) ## When to use - You need precise triangle and vertex counts plus bounding-box size before 3D printing or game export. - You want to review glTF/GLB materials, animations and the scene node tree in the browser. - You received an STL or OBJ and must confirm topology and dimensions without installing extra software. ## How it works - Select a .stl, .obj, .glb or .gltf file (maximum 26 MB). - Optionally choose initial render mode (Shaded, Wireframe or Normals), studio background and auto-rotate. - Server-side parsers extract exact statistics, materials, animations and the node hierarchy. - The interactive viewer loads; meshes larger than 80 000 triangles are uniformly sampled for preview only while counts stay exact. ## Use cases - Verify STL files for 3D printing by checking exact triangle count and bounding-box dimensions. - Audit glTF or GLB assets for materials, animations and scene graph before engine import. - Inspect OBJ meshes, including n-gon triangulation and index handling. ## Frequently asked questions ### Which file formats are supported? Binary and ASCII STL, OBJ (n-gons triangulated), GLB and glTF 2.0. ### Are the vertex and triangle counts exact? Yes. Statistics always reflect the full model even when the preview is sampled. ### Can Draco or meshopt compressed geometry be viewed? No. Compressed meshes cannot be decoded server-side; only structure, materials and animations are reported. ### How do I interact with the 3D viewer? Drag to rotate, scroll to zoom. The chosen render mode sets shaded, wireframe or normals display. ### What is the upload size limit? 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