STEP Model Viewer
Open and inspect step files directly in your browser. No installation.
ISO 10303 CAD tessellation for assemblies and parts.
Drop your STEP file here
Upload a STEP or STP CAD file or ZIP package to inspect your engineered geometry.
Why Developers Choose GLBKit for STEP
GLBKit tessellates ISO 10303 STEP and STP CAD files in the browser using OpenCascade. It is useful for inspecting assemblies, parts, and CAD-stored colors, not for editing CAD geometry.
Browser Based STEP
Open STEP and STP files directly in your browser without installing software.
Local Tessellation
Tessellate CAD geometry locally using OpenCascade in the browser.
Fast WebGL Rendering
Render tessellated CAD with GPU-accelerated WebGL.
Assembly Inspection
Inspect multi-part assemblies, parts, and CAD-stored colors.
ISO 10303 Standard
View AP203, AP214, and AP242 STEP files from common CAD tools.
No Server Upload
Inspect STEP files without uploading them to a remote server.
About this format
STEP (Standard for the Exchange of Product Data) is the ISO 10303 standard for exchanging CAD data between tools. It captures exact B-rep geometry, product structure, and metadata from SolidWorks, Fusion 360, CATIA, Siemens NX, and Onshape. GLBKit renders .step and .stp files in the browser so you can review CAD geometry without a CAD licence.
What is a .step file?
.step (also .stp) is a text-based CAD exchange format defined by ISO 10303. It describes exact B-rep geometry, product structure, tolerances, and metadata in a single file.
STEP is the universal CAD exchange format, supported by every major CAD tool. It is the safest way to share geometry between vendors.
- ISO 10303 text-based CAD exchange format
- Stores exact B-rep geometry, product structure, metadata
- Universal exchange between SolidWorks, Fusion 360, CATIA, NX, Onshape
- Preserves tolerances, materials, and product structure
Common uses for STEP files
STEP is the standard for CAD data exchange. Every mechanical engineer and product designer uses STEP to share geometry between vendors and tools.
- CAD exchange between vendors and toolchains
- Long-term archival of product geometry
- Manufacturing handoff and supplier collaboration
- Engineering review and tolerance analysis
How GLBKit renders .step files
GLBKit tessellates the STEP geometry in the browser and renders the resulting mesh with WebGL. The tessellation is a visual approximation of the exact CAD geometry.
- Drop a .step or .stp file to start
- Orbit, pan, and zoom with mouse, touch, or pen
- Tessellated mesh rendering of B-rep geometry
- No upload, no signup, fully local processing
GLBKit capabilities for .step
GLBKit renders the visible geometry of a STEP file as a tessellated mesh. It is a viewer for review, not a CAD editor: you cannot modify geometry or product structure.
- Tessellated B-rep rendering for visual review
- Inspect product structure and metadata
- Verify geometry before manufacturing handoff
- Process files locally in the browser
Who uses GLBKit for .step files
STEP is the daily format of mechanical engineers and product designers. GLBKit is the fastest way to open a STEP file without a CAD licence.
- Mechanical engineers and product designers
- Manufacturing engineers reviewing supplier geometry
- Quality and inspection teams
- Students learning CAD exchange
Open your .step file now
Drop a .step or .stp file into the viewer. Inspect CAD geometry in seconds.
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Frequently Asked Questions
Common questions about opening STEP and STP CAD files in the browser.