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

STEP vs GLB: STEP keeps exact CAD geometry for engineering; GLB renders natively in the browser for web and AR. How to choose, and how to convert.

STEP and GLB are two of the most common 3D formats, but they come from different worlds. STEP (ISO 10303) carries exact CAD geometry for engineering; GLB (glTF 2.0) is a lightweight format that renders natively in a browser. The short version: keep STEP when the recipient has to re-engineer or machine the part, and use GLB when you need to show the model on the web, in a presentation or in AR.

STEP, the CAD industry standard

STEP is the neutral exchange format for industrial CAD data, standardized as ISO 10303 since 1994, with AP242 the modern profile for mechanical design. It encodes exact B-Rep geometry, assemblies, tolerances and metadata, and it's what your engineering team exports from SolidWorks, CATIA, Siemens NX or Fusion 360. Neutral formats like STEP exist for a concrete reason: a NIST-commissioned study estimated that imperfect data interoperability costs the U.S. automotive supply chain at least $1 billion a year, more than 80% of it rework from files that don't transfer cleanly.

• Exact geometry (B-Rep), no precision loss
• Supports multi-part assemblies, tolerances and PMI
• Interoperable across every major CAD system
• Large files (roughly 1-500 MB depending on complexity)
• Not readable by web browsers without conversion

GLB, the web 3D standard

GLB (GL Transmission Format Binary) is glTF 2.0 packaged as a single binary file. Created by the Khronos Group, glTF 2.0 was published as the international standard ISO/IEC 12113:2022, and browsers, web engines and e-commerce platforms (Shopify, Apple AR Quick Look) render it natively. Khronos calls glTF 'the JPEG of 3D': a compact delivery format, not an engineering format.

• Renders in real time directly in the browser
• Carries PBR materials, textures and animation
• Lightweight and streamable, with optional Draco mesh compression
• Triangulated mesh - no CAD-precision B-Rep data
• Ideal for product pages, AR and web presentations

STEP vs GLB: side by side

Which format should you use for sharing?

Sharing with an engineer or subcontractor who has to rework the part -> keep STEP. Sharing with a client, a sales team, or embedding on a website -> GLB is the right choice. The two aren't rivals; most workflows use both, STEP upstream and GLB downstream.

Converting STEP to GLB for the web

OmniView 3D runs this conversion automatically: upload a STEP file and get an interactive web viewer in about 60 seconds, with no Blender or manual pipeline. You can also use the dedicated STEP-to-GLB converter, and optimize the GLB file size before publishing. The model stays private by default and the share link is revocable. For how GLB compares with its sibling formats, see GLB vs glTF and FBX vs GLB.