STEPCAD solid
.step / .stp
Neutral CAD exchange files. Curved surfaces are tessellated into a mesh.
A COMMON LANGUAGE FOR YOUR MODELS
Different formats.
One simple workflow.
Start with CAD surfaces or a polygon mesh.
Leave with the format your next tool needs.
WHAT YOU CAN BRING
Supported inputs.
IGESCAD surface
.iges / .igs
CAD curves and surfaces. Only tessellatable surfaces are exported.
STLTriangle mesh
.stl
Binary and ASCII STL geometry for 3D printing. No colors or units.
OBJPolygon mesh
.obj
Wavefront geometry. Companion MTL files and textures are not imported.
PLYPolygon mesh
.ply
Binary and ASCII polygon meshes. Point-cloud-only files are not supported.
GLB3D scene
.glb
Self-contained glTF binary files. Static triangle geometry is converted.
GLTF3D scene
.gltf
Self-contained glTF JSON with embedded buffers. External files are not loaded.
WHAT YOU CAN TAKE AWAY
Four useful destinations.
STL
3D printing · binary mesh
OBJ
3D editing · geometry only
GLB
Web & AR · untextured mesh
PLY
Mesh workflows · binary mesh
Geometry comes first.
Exports include static triangle geometry and normals. Materials, textures, animations, CAD features, and automatic mesh repair are outside this version. STEP and IGES are input formats only. Compressed, rigged, and animated glTF models are not supported.
LESS CONVERTING. MORE CREATING.
Find your next conversion.
STEPSTL
STEP to STL
Take a CAD part to your 3D printer.
STLOBJ
STL to OBJ
Bring a printable mesh into a 3D editor.
OBJSTL
OBJ to STL
Make an OBJ mesh ready for your slicer.
GLBSTL
GLB to STL
Turn a web model into a printable mesh.
STLGLB
STL to GLB
Give your STL a web-friendly format.
STEPOBJ
STEP to OBJ
Move CAD geometry into a mesh workflow.
IGESSTL
IGES to STL
Prepare legacy CAD surfaces for printing.
PLYSTL
PLY to STL
Move a scanned mesh into your slicer.
OBJGLB
OBJ to GLB
Make a lightweight model for the web.
GLBOBJ
GLB to OBJ
Open web geometry in a mesh editor.
STLPLY
STL to PLY
Move between mesh processing tools.
GLTFGLB
GLTF to GLB
Package embedded glTF geometry into one file.
THE SMALL PRINT, MADE SIMPLE
A few good questions.
Everything else you might want to know.
Are my model files uploaded?
No. Your selected model is read and converted inside your browser. The site downloads the conversion engine when needed, but does not send your model to a server. Closing the tab clears the working session.
Is this converter free?
Yes. The supported conversions are free to use, with no account required. The current limit is one file at a time, up to 50 MB and one million output triangles.
Can I convert STL into an editable STEP solid?
No. This version exports mesh formats only. It does not reconstruct CAD surfaces or parametric history from triangles, and it does not export STEP or IGES.
Will materials, textures, and animations be preserved?
This version focuses on static mesh geometry and normals. Exports use geometry only or a neutral material. Textures, animation, rigging, and CAD feature history are not retained. Animated or compressed glTF geometry may be rejected.
Why does my model have a different scale in another app?
Mesh coordinate values are preserved without automatic rescaling. STEP and IGES imports are normalized to millimeters. STL and OBJ do not reliably define units, while glTF usually uses meters. Check import units in the destination app.
Can I edit the model after converting it?
Yes. Download the result, then open a compatible mesh format in Reactor 3D to cut, combine, or modify the model in your browser. Your file is not automatically transferred between sites.