Technical·5 min read·29 Apr 2026

STEP vs GLB: which 3D format for which use case

Two formats keep showing up in furniture pipelines: STEP and GLB. They look like alternatives, but they aren't — they solve different problems. Picking the wrong one for the wrong job costs you either fidelity (factory needs precision) or speed (buyer needs a fast preview).

TL;DR

STEP — for production

STEP (.stp / .step, ISO 10303) is a precision CAD interchange format. Curves and surfaces are stored as mathematical equations, not faceted geometry. A workshop can machine directly off a STEP file with sub-millimeter accuracy.

Editable in SolidWorks, Fusion 360, Rhino, FreeCAD.
Lossless geometry — nothing rounded or simplified.
No materials, no textures, no animations. Just the form.
Slow to load in browsers; not built for real-time rendering.
Typical size: 5–80 MB per chair.

GLB — for the web

GLB (the binary form of glTF) is the web's native 3D format. Geometry is faceted (triangles), materials use PBR (physically based rendering), and a single .glb bundles meshes + textures + animations together.

Plays in the browser — Chrome, Safari, Firefox, all native.
AR-ready on Android (Scene Viewer) and via USDZ conversion on iOS Quick Look.
Beautiful materials — leather, fabric, wood grain look right under web lighting.
Not editable in CAD — the precision is gone, this is for viewing.
Typical size: 200 KB – 5 MB per chair (after optimization).

Use-case matrix

Use case	Format	Why
Factory production order	STEP	Precision geometry; CNC needs equations
Web viewer / product page	GLB	Loads in the browser instantly
AR preview on phone	GLB (+ USDZ for iOS)	Native AR runtime needs glTF-family
Catalog hero render	Render the GLB → JPG	Pre-rendered image is universal
Interior designer mockup	STEP	They want to import into SketchUp/3DS Max
Email attachment	PDF render	Don't attach 3D files to email — ever

Keep both formats in sync

The right move is to author once and export to both. From SolidWorks or Fusion:

Model the product once at full precision.
Export chair_v1.step for production handoff.
Bake materials and export chair_v1.glb for the web.
Upload both to the same workspace folder, named identically.

When you iterate the design, re-export both. Identical filenames keep the link consistent.

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STEP — for production

Editable in SolidWorks, Fusion 360, Rhino, FreeCAD.

Lossless geometry — nothing rounded or simplified.

No materials, no textures, no animations. Just the form.

Slow to load in browsers; not built for real-time rendering.

Typical size: 5–80 MB per chair.

GLB — for the web

Plays in the browser — Chrome, Safari, Firefox, all native.

AR-ready on Android (Scene Viewer) and via USDZ conversion on iOS Quick Look.

Beautiful materials — leather, fabric, wood grain look right under web lighting.

Not editable in CAD — the precision is gone, this is for viewing.

Typical size: 200 KB – 5 MB per chair (after optimization).

Use-case matrix

Use case	Format	Why
Factory production order	STEP	Precision geometry; CNC needs equations
Web viewer / product page	GLB	Loads in the browser instantly
AR preview on phone	GLB (+ USDZ for iOS)	Native AR runtime needs glTF-family
Catalog hero render	Render the GLB → JPG	Pre-rendered image is universal
Interior designer mockup	STEP	They want to import into SketchUp/3DS Max
Email attachment	PDF render	Don't attach 3D files to email — ever

Keep both formats in sync

The right move is to author once and export to both. From SolidWorks or Fusion:

Model the product once at full precision.

Export chair_v1.step for production handoff.

Bake materials and export chair_v1.glb for the web.

Upload both to the same workspace folder, named identically.

When you iterate the design, re-export both. Identical filenames keep the link consistent.