Kompulsator.
Open, orbit, slice, and accurately measure any 3D model right in your browser. Inspect X × Y × Z dimensions in millimeters and inches, calculate volume in cm³, verify watertight manifold geometry for 3D printing, and convert files between formats — 100% free and processed privately on your device.
Ready. Drop your own 3D file (STL, OBJ, 3MF, PLY, STEP, GLB, FBX, USDZ, BLEND, GLTF) or explore the interactive demo presets above.
Every 3D file format encodes geometry differently: as raw triangle facets (Mesh), compressed XML/ZIP packages, or analytical boundary representations (B-Rep CAD). Explore how each format works and how our free online 3D viewer processes it locally.
The universal standard for FDM and resin SLA/MSLA 3D printing. It represents solid surfaces using unindexed triangle facets and unit normal vectors. Our parser automatically detects both Binary STL (80-byte header + 50 bytes per triangle) and ASCII STL files.
The industrial mechanical engineering standard (Standard for the Exchange of Product model data) governed by ISO 10303-21. It stores exact Cartesian points, curves, edge loops (EDGE_LOOP, POLY_LOOP), and boundary faces (ADVANCED_FACE).
Designed by the 3MF Consortium (Microsoft, Prusa Research, UltiMaker, Autodesk) to replace legacy STL files. A .3mf file is a Deflate-compressed ZIP container holding XML mesh definitions (3D/3dmodel.model), explicit units, multi-material colors, and slicer metadata.
A foundational polygon mesh format widely supported across sculpting, VFX, and 3D scanning pipelines. Stores vertex positions (v), UV texture coordinates (vt), vertex normals (vn), and N-gon polygonal faces (f) which are automatically triangulated for volume analysis.
The GL Transmission Format engineered by the Khronos Group for high-speed WebGL, WebGPU, e-commerce, and game engines. Binary .glb bundles the JSON scene graph, binary geometry buffers (POSITION, NORMAL, INDICES), and PBR materials into a single compact file.
An industry mainstay for exchanging game assets, architectural visualizations, and rigged meshes. Stores vertex coordinate arrays (Vertices) and bitwise-delimited polygon indices (PolygonVertexIndex) in ASCII or Kaydara Binary format.
Developed at Stanford University for structured-light 3D scanners, LiDAR sensors, and photogrammetry. Supports both human-readable ASCII and high-density binary streams (binary_little_endian and binary_big_endian) with per-vertex RGB attributes.
Based on Pixar’s Universal Scene Description and adopted by Apple as a zero-compression ZIP archive (.usdz) for AR Quick Look on iPhone, iPad, and Apple Vision Pro. Encodes point3f[] points and polygonal face topology.
Blender’s native binary project container built around self-describing SDNA (Structure DNA) memory blocks, storing pointer width, endianness, and internal ME (Mesh) and OB (Object) data structures.
Choosing the right 3D extension determines dimensional tolerance for CNC/3D printing, PBR material preservation, and file size. Compare all 10 supported formats below.
| File Format | Geometry Representation | Native Unit Metadata | Colors, Materials & Textures | Primary Engineering / Creative Use |
|---|---|---|---|---|
| .STL (Binary / ASCII) | Unindexed triangle facets (Mesh) | None (assumed 1 unit = 1 mm) | None (pure surface geometry only) | FDM & SLA 3D printing, rapid prototyping |
| .3MF (3D Manufacturing) | Indexed triangle mesh inside ZIP/XML package | Explicitly defined (mm, cm, m, inch) | Yes (multi-material AMS/MMU colors, textures) | Modern multi-color 3D printing (Bambu, Prusa) |
| .STEP / .STP (ISO 10303) | Exact analytical boundary representation (B-Rep) | Defined in SI header (typically mm) | Part & surface CAD colors (AP214 / AP242) | Mechanical CAD exchange, CNC machining, injection molding |
| .OBJ (Wavefront) | Indexed vertices & polygons (Tris / Quads / N-gons) | None (depends on exporting DCC tool) | Yes (via companion .MTL material library) | Digital sculpting, VFX, architectural rendering |
| .GLB / .GLTF (Khronos) | Indexed binary buffers + JSON scene hierarchy | Meters (1 unit = 1 m per specification) | Yes (full PBR metallic-roughness, animations) | WebGL/WebGPU viewers, e-commerce 3D, game engines |
| .FBX (Filmbox) | Polygon mesh + skeletal rig & animation tracks | Stored in metadata (`UnitScaleFactor`, usually cm) | Yes (surface shaders, UV maps, skinning weights) | Unreal Engine, Unity, character & game asset pipelines |
| .PLY (Stanford) | Point cloud & polygon mesh | None (typically mm or m from scanner) | Yes (per-vertex RGB color attributes) | 3D laser scanning, LiDAR, photogrammetry |
| .USDZ / .USDA | Hierarchical USD scene description (Pixar / Apple) | Defined (`metersPerUnit`, default 1 cm) | Yes (UsdPreviewSurface PBR shaders) | Apple AR Quick Look (iOS / iPadOS / visionOS) |
| .BLEND (Blender) | Binary SDNA memory blocks (`Mesh`, `MVert`, `MPoly`) | Blender scene units (default meters) | Cycles / EEVEE shader nodes & packed textures | Native Blender project archival and editing |
Engineers, makers, and clients frequently receive .stl, .step, .3mf, or .glb attachments and need to verify part dimensions or internal geometry without installing multi-gigabyte CAD suites. Here is how our browser tool works.
Select or drag any supported 3D file from your computer or smartphone. Our JavaScript engine decodes binary and ASCII geometry directly in browser memory — keeping proprietary CAD designs 100% private.
Switch between Studio PBR, Clay MatCap, and Surface Normals shading to spot flipped faces. Drag the Clipping Plane slider along the Z, X, or Y axis to inspect internal cavities, wall thickness, and screw bosses.
Read exact bounding box dimensions in mm and inches, true volume in cm³, and estimated filament/resin weight for PLA, PETG, ABS, or UV resin. Export the mesh to STL, OBJ, GLB, or PLY in one click.
Before slicing an .stl or .3mf file in Bambu Studio, PrusaSlicer, OrcaSlicer, or UltiMaker Cura, the mesh must form an enclosed, watertight volume (a Manifold mesh). Missing triangles or non-manifold open edges can cause slicers to misinterpret internal bores or generate defective G-code toolpaths.
Our viewer computes exact geometric volume using the Signed Tetrahedron Volume integral: V = |Σ (v1 × v2) · v3 / 6|. Combined with outer surface area (cm²), it models both solid outer perimeters (1.2 mm shell thickness) and sparse internal infill to give you an instant gram weight estimate before opening a slicer.
Installing desktop CAD workstations (SolidWorks, Inventor, Fusion 360) or 3D DCC suites (Blender, Maya, 3ds Max) requires gigabytes of disk space and licensing. With the free Kompulsator.pl Online 3D Viewer, you can preview mechanical assemblies and game assets immediately on any laptop, tablet, or phone.
The built-in format converter also bridges pipeline gaps: if a vendor sends a STEP, OBJ, PLY, 3MF, or GLTF file and your workflow requires a binary .STL for 3D printing — or a compressed .GLB for web/AR — you can convert and download it directly in the browser.
Clear, technical answers regarding STL, STEP, OBJ, 3MF, GLB, FBX, USDZ, BLEND, PLY, and GLTF file inspection.
You can open 10 major 3D formats: STL (ASCII & Binary), OBJ (Wavefront), 3MF (3D Manufacturing Format), PLY (ASCII & Binary Little/Big Endian), STEP / STP (ISO 10303-21 CAD), GLB, GLTF, FBX (ASCII), USDZ / USDA, and BLEND files.
Yes. The viewer and format converter on Kompulsator.pl are 100% free to use with no file count limits, no watermarks on exported PNG snapshots or converted 3D meshes, and no account registration required.
Yes. Your files are never uploaded to any external server. All binary reading, mesh triangulation, XYZ bounding box calculation, and format conversion run strictly inside your local browser memory, making it safe for NDA-protected engineering files.
Formats like STL and OBJ store raw coordinate numbers without unit metadata. If a part was exported in inches or centimeters, simply change the “Source File Unit” dropdown in the left panel to Inches (×25.4 to mm) or Centimeters (×10 to mm) to rescale dimensions, volume, and exports to millimeters.
The calculator combines the exact mesh volume (in cm³) and surface area (in cm²). It accounts for solid outer walls (~1.2 mm perimeter shell) plus your chosen internal infill percentage (15%, 20%, 40%, or 100%) and multiplies the effective volume by the selected material density (e.g., 1.24 g/cm³ for PLA or 1.27 g/cm³ for PETG).
Set your preferred camera angle, shading style, and model color, then click “PNG Snapshot (Alpha)” in the bottom export bar. The viewer renders a clean frame without the background grid and downloads a transparent PNG image ready for documentation or presentations.
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Szukasz polskiej wersji interfejsu oraz pełnej dokumentacji technicznej formatów STL, STEP, 3MF, OBJ, GLB, FBX, USDZ, BLEND i PLY po polsku? Przejdź do głównej polskiej zakładki pod adresem kompulsator.pl/darmowa-przegladarka-3d/.