01
Bring your model.
Drop a supported CAD or mesh file to get started.
All-format converter
STEP to STL converter
Convert STEP and STP files to binary STL in your browser. Preview your model, choose surface detail, and download a mesh for your slicer.
No account needed
YOUR CONVERSION WORKSPACE
Powered by reactor3d.xyz01 Choose your model
3D
Drop your model here
Keep the file. Change the format.
or drag & drop · up to 50 MBSTEPIGESSTLOBJPLYGLBGLTF
02 Make it your format
A new format. A fresh possibility.
GOOD TO KNOW
STEP surfaces become triangles. CAD dimensions are read in millimeters; STL does not store a unit, so select millimeters in your slicer.
A SHORTER PATH FROM A TO B
Three steps.
From your CAD app to your next idea.
02
Pick a new format.
Choose the file your next tool needs. We handle the conversion in your browser.
03
Get back to making.
Preview, download, and carry on. No inbox links or accounts to slow you down.
LESS CONVERTING. MORE CREATING.
Keep your workflow moving.
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.
THE SMALL PRINT, MADE SIMPLE
A few good questions.
Everything else you might want to know.
What should I know about STEP to STL conversion?
STEP surfaces become triangles. CAD dimensions are read in millimeters; STL does not store a unit, so select millimeters in your slicer.
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.