Quickly convert mesh STL files to CAD-friendly STEP.
No signup
No limits
100% free
Convert STL to STEP
How to convert STL to STEP Online
Click the "Select STL file" field and choose your .stl file from your computer.
Hit Convert STL to STEP. If CAD libraries are available, we convert your mesh to a .step file.
When the result appears, click Download STEP to save the file.
Open the downloaded .step in your preferred CAD software (e.g., Fusion 360, SolidWorks, FreeCAD).
Tips for best results
Use watertight (manifold) STLs to avoid conversion issues.
Reduce mesh complexity beforehand to speed up conversion.
If conversion fails, try repairing the STL in Meshmixer/Netfabb and re-upload.
Frequently Asked Questions
Are CAD libraries always available?
If the server lacks OCC/CadQuery, we'll show a friendly message. We never store your files.
What output format do I get?
You receive a .step file compatible with most CAD tools.
Why convert STL to STEP?
STEP is a CAD-friendly solid format ideal for editing, parametric operations, and manufacturing workflows, while STL is a triangle mesh.
Does this tool fix mesh issues?
Basic conversion only. If the STL has holes or self-intersections, repair it first for a reliable STEP result.
Is my data private?
Yes. Files are processed transiently and are not stored.
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