# Multi-Format CAD Viewer & Online Measurement Tools

Quickly view and measure SolidWorks, NX, Inventor, CATIA, Parasolid X_T, SAT, JT solids, STEP, IGES and mesh formats online. Convert files and share 3D models by link with an optional password. Mesh measurements are approximate.

## Questions about this task

### Which CAD file formats can I view online?

CADProps supports 92+ accepted file extensions across supported format groups. CADProps opens STEP/STP, IGES/IGS, STL, OBJ, 3MF, static GLB/glTF and supported DWG/DXF files, and reads native CAD files in-house. Parasolid X_T/X_B and ACIS SAT/SAB are read as B-Rep. SolidWorks SLDPRT, Autodesk Inventor IPT and CATIA V5 CATPart give exact geometry and exact STEP export when the part's B-Rep is read completely; otherwise they show the display triangles saved in the file. SolidWorks SLDASM, Inventor IAM, Siemens NX (UG NX) PRT, JT, Rhino 3DM and Solid Edge PAR/PSM show saved or tessellated display geometry with approximate properties, and their STEP export contains triangles. Autodesk Fusion F3D designs show their current bodies placed by component as an approximate display, without area, volume or exact STEP. CATIA CATProduct shows only the thumbnail saved in the file; Solid Edge ASM shows supported saved assembly scenes as an approximate preview, otherwise its thumbnail. Package assembly references in ZIP; incomplete assemblies show warnings. 3DXML XML tessellations, PLY triangle surfaces and static supported VRML97 (WRL/VRML/WRZ) load as approximate meshes with unverified units assumed millimetres. AMF flat triangles use declared units, defaulting to millimetres. Static X3D scenes (X3D/X3DV), including NURBS surfaces tessellated for preview, load as approximate meshes; units are verified only when the file declares them, otherwise the X3D default unit, metres, is assumed. I-DEAS Universal (UNV) finite-element meshes show their element faces and edges as approximate meshes; units are verified from the file's units dataset, otherwise millimetres are assumed, and I-DEAS CAD records show only a partial straight-line wireframe that cannot be exported. VDA-FS (VDA/VDAFS) surfaces are sampled into approximate meshes in millimetres, the unit the format fixes; trimmed edges are simplified. Creo / Pro/ENGINEER Neutral (NEU) parts rebuild plane, cylinder, cone and torus faces for display, with units assumed in millimetres and no physical properties. IFC and IFCZIP building models show their elements as approximate meshes grouped by storey; openings are not cut, Boolean results and curved B-Reps are omitted, and units come from the project's length unit. Standalone U3D files show their meshes with units assumed in millimetres; very large meshes are simplified for speed. Standalone PRC files show their saved tessellation and supported B-Rep faces as an approximate mesh, with units from the model's declaration. These eleven inputs offer mesh exports, not exact B-Rep. SLDDRW, IDW, DFT, CATDrawing and Creo DRW/DRW.N show only saved preview images with unknown units: no drawing-content reading, 3D geometry, rotation, measurement, exact properties or model conversion. If no usable preview is saved, request PDF, DXF, DWG or the 3D model. G-code for 3D printing and CNC (GCODE, GCO, NC, NGC, TAP) is drawn in the browser as toolpath lines with layers, extents and path lengths; it is not a machining simulation and cannot be converted.

### Can I measure a STEP or STP file online?

Yes. Upload a STEP or STP file to inspect its 3D geometry and overall X, Y and Z dimensions. Point-to-point distances picked in the viewer are approximate. Switch display units between metric and imperial without changing the source geometry.

### How are CAD volume, surface area and weight calculated?

STEP and IGES properties are calculated from B-Rep geometry. Volume requires valid closed solids; calculated mass is volume multiplied by your chosen material density. Check the model units, loaded parts and density before using the results.

### Can I measure STL files and other mesh models?

You can inspect supported STL, OBJ, 3MF and static GLB/GLTF models. Mesh dimensions and surface properties come from triangle geometry; volume and density-based mass are approximate and require a closed, consistent mesh. Validated conversions are downloadable. 2D DWG/DXF files use the drawing workflow; detected 3D ACIS solids are shown through a separate mesh-preview path and are explicitly identified as previews.

### Do I need to install CAD software or create an account?

No installation or account is required to view and measure. Register or sign in to convert, save files across devices or create a share link. Guest files expire after the displayed retention period. Shared models can be viewed without an account.

### Are my CAD files kept on your server?

Files are processed on CADProps servers over HTTPS (TLS 1.2 or 1.3). Guest files are automatically deleted about one hour after upload, including previews and results. You can delete them earlier. Signed-in uploads are saved to My files (200 MB, up to 100 files) and automatically deleted after 90 days without use. You can delete them anytime; their share links will stop working. Original CAD files are not sent to external CAD processing services or used to train AI.

### What is the largest CAD file CADProps can open?

Each file can be up to 95 MiB, and a ZIP package can expand to 200 MiB. Assemblies can have up to 2,000 bodies, and a preview can show up to 1,000,000 triangles. Most previews finish within 10 seconds.

### Who is CADProps built for?

CADProps is built for machining and quoting staff, purchasing and supply-chain engineers, and inspection staff who need a part's dimensions, volume, estimated weight or assembly contents without installing CAD software. It works in desktop and mobile browsers.

- [Dimensions & measure](https://www.cadprops.com/tools/cad-dimensions/index.md): Get STEP file dimensions online, check X/Y/Z bounding extents, measure supported geometry and verify units before using CAD dimensions for engineering decisions.
- [Volume calculator](https://www.cadprops.com/tools/cad-volume-calculator/index.md): Calculate solid volume from STEP B-Rep geometry. Check model validity, source units and assembly scope before using or exporting the result.
- [Surface area](https://www.cadprops.com/tools/cad-surface-area/index.md): Calculate surface area from STEP geometry, inspect individual parts and export the result in mm². Keep open surfaces and solid-volume requirements distinct.
- [Weight calculator](https://www.cadprops.com/tools/cad-weight-calculator/index.md): Estimate mass from valid STEP solid volume and your chosen material density. Inspect the model, verify units and download a property CSV without an account.
- [STEP viewer](https://www.cadprops.com/tools/step-viewer/index.md): Open STEP and STP files in your browser. No CAD install and no account. Measure edges and holes, and read volume from a closed solid.
- [IGES / IGS viewer](https://www.cadprops.com/tools/iges-viewer/index.md): Inspect IGES surfaces, solids and curve-only files using Open CASCADE. Read dimensions and surface area where surfaces exist; volume and mass require valid closed solids. Curve-only files use a wireframe preview.
- [SolidWorks viewer](https://www.cadprops.com/tools/solidworks-viewer/index.md): Open SolidWorks SLDPRT files online and inspect supported SLDASM assemblies from ZIP. Check dimensions, loaded geometry and missing-component warnings without a SolidWorks install.
- [Siemens NX / UG NX viewer](https://www.cadprops.com/tools/nx-viewer/index.md): Open Siemens NX or UG NX PRT files online without NX. Check geometry and dimensions, upload assemblies as a ZIP with their references, and convert supported models to STEP.
- [Autodesk Inventor viewer](https://www.cadprops.com/tools/inventor-viewer/index.md): Online IPT viewer for Autodesk Inventor parts. Open an IPT in the browser without Inventor or an account, check dimensions, and upload IAM assemblies as a ZIP. Export to STEP when the model is read.
- [CATIA viewer](https://www.cadprops.com/tools/catia-viewer/index.md): Open CATIA V5 CATPart files online from the geometry CATIA saved, check dimensions and convert to STEP. CATProduct files show only their saved thumbnail.
- [DWG / DXF viewer](https://www.cadprops.com/tools/dwg-viewer/index.md): Open DWG and DXF files online. Inspect supported 2D layouts, layers and measurements, or preview detected 3D ACIS solids as a mesh. Native DWG write-back is not supported.

HTML page: https://www.cadprops.com/