STEP vs GLB: What's the Difference for 3D Sharing?

STEP and GLB are the two dominant 3D formats — but they don't do the same thing. Understanding the difference helps you choose the right format for your use case.

STEP and GLB are two of the most common 3D formats, but they come from different worlds and serve distinct needs. If you need to share a 3D model with a client, subcontractor, or embed it on a website, understanding this difference will save you time.

STEP — the CAD industry standard

STEP (ISO 10303) is the standard exchange format for industrial CAD data. It encodes exact part geometry, assemblies, tolerances, and technical metadata. It's the format your engineering team exports from SolidWorks, CATIA, Siemens NX, or Fusion 360.

• Exact geometry (B-Rep) — no precision loss
• Supports multi-part assemblies
• Interoperable across all major CAD software
• Often large files (1–500 MB depending on complexity)
• Not natively readable by web browsers without conversion

GLB — the web 3D standard

GLB (GL Transmission Format Binary) is the 3D format optimized for the web, created by the Khronos Group. It's essentially a packaged binary GLTF. Browsers, web rendering engines, and e-commerce platforms (Shopify, Apple AR Quick Look) support it natively.

• Optimized for real-time rendering in the browser
• Supports PBR textures, materials, and animations
• Lightweight thanks to Draco compression (often 5–20x smaller than STEP)
• No CAD precision data (triangulated geometry)
• Ideal for product pages, AR, and web presentations

Which format should you use for sharing?

Sharing with an engineer or subcontractor who needs to rework the part → keep STEP. Sharing with a client, sales team, or embedding on a website → GLB is more appropriate. Either way, OmniView 3D automatically converts STEP files to a web viewer so you don't have to manage the conversion.