What happens when STEP is converted to STL?
The precise surfaces and solid geometry stored in the STEP file are tessellated into a mesh of triangles. The STL output stores this triangular approximation rather than the original CAD surfaces.
CAD & 3D
STEP to STL Converter
Convert STEP and STP CAD files to STL online. Create a 3D-printable mesh locally in your browser without uploading your model.
Tool
STEP to STL Converter
Convert STEP and STP CAD files to STL online. Create a 3D-printable mesh locally in your browser without uploading your model.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online STEP to STL Converter to turn precise STEP or STP CAD models into STL mesh files for 3D printing, slicing, visualization, and mesh-based workflows. Open the CAD model, preview its geometry, choose the tessellation quality, review the resulting triangle count, and download the converted STL file. Higher quality settings preserve curved surfaces more accurately but create larger files. Conversion runs locally in your browser, keeping your CAD model on your device.
Examples
- cube.step
- rounded-part.stp
Frequently Asked Questions
Can I convert both STEP and STP files?
Yes. STEP and STP are common extensions for the same standardized CAD exchange format.
What tessellation quality should I choose?
Use a higher quality for curved, detailed, or small parts where surface accuracy matters. Use a lower quality when a smaller file and faster processing are more important.
Does STL preserve colors, materials, or assemblies?
No. Standard STL stores only triangular surface geometry. Colors, materials, product names, assembly relationships, and most CAD metadata are not preserved.
Will the STL be ready for 3D printing?
The converted mesh represents the STEP geometry, but printability still depends on factors such as wall thickness, closed solids, model scale, orientation, printer limits, and slicer settings.
Why is the STL file larger than the STEP file?
Detailed tessellation can create hundreds of thousands or millions of triangles. Curved surfaces and high-precision settings usually produce especially large STL files.
Is my CAD file uploaded?
No. The STEP model is converted locally in your browser.
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