A vendor sent an .stp model and you need it in a render, game or web scene. OBJ is the mesh format those tools import most reliably. This converter runs entirely in your browser: the file is processed on your own device and never uploaded.
Why convert STP to OBJ?
A vendor sent an .stp model and you need it in a render, game or web scene. OBJ is the mesh format those tools import most reliably.
How it works
Drop your .stp file above and download the .obj. The conversion engine (Open CASCADE, compiled to WebAssembly) runs inside the page, so it works the same on Windows, macOS, Linux and ChromeOS without installing anything.
STP vs OBJ
STP (STEP file): STP is the same ISO 10303 STEP format under a shorter extension. The contents are identical to a .step file: exact solid geometry described by mathematical surfaces. Used by: Supplier part libraries (McMaster-Carr, TraceParts), SolidWorks, Fusion 360, CATIA and FreeCAD.
OBJ (Wavefront): OBJ is a simple text mesh format from Wavefront Technologies. It stores vertices, faces, normals and texture coordinates; materials live in a separate .mtl file next to it. Used by: Blender, Maya, 3ds Max, ZBrush, and photogrammetry and 3D-scanning tools.
Quality notes
STEP and IGES describe exact curved surfaces; STL and OBJ can only hold triangles. The converter tessellates every surface into a triangle mesh, so a perfect cylinder becomes many flat facets. The feature history, parametric dimensions and assembly metadata do not survive — only the shape does. OBJ keeps normals for smooth shading in render tools.
Common use cases
Showing a purchased component in a product render; building a digital twin scene; converting catalogue parts for Blender.
Frequently asked questions
Can I open the OBJ in Blender?＋
Yes. File → Import → Wavefront (.obj).
Are colours kept?＋
No. CAD colours are not transferred; assign materials in your render tool.
Is .stp the same as .step?＋
Yes, identical format with a shorter extension.
Does it work offline?＋
After the page and engine have loaded once, the conversion runs locally in your browser.