STEP/STP → STL: send engineering models to your slicer.
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Turn CAD solids (STEP/STP) into triangular mesh STL. Higher precision captures more detail but creates larger files. All processing happens locally in your browser, so your files are never uploaded.
DefaultY-up
Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.
Convention used by OpenGL, Three.js, and most Web 3D engines. Choose this for models from web or game engines.
Convention used by Blender (default), 3ds Max, and some CAD software. Try this if the model appears sideways.
Default0°
Range-180° – 180°
Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation.
Default0°
Range-180° – 180°
Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation.
Default0°
Range-180° – 180°
Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation.
DefaultRoot node transform
Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.
Rotation is written into all vertex coordinates and applies consistently to every export format; geometry data is rewritten.
Rotation is written as a root node transform while vertex coordinates stay unchanged; better for skinned or animated models, but formats that ignore node transforms (such as STEP) won't apply it.
DefaultBinary STL
Choose the STL storage format. Both formats produce identical print results.
Smaller file, faster to load. Supported by Cura, PrusaSlicer, Chitubox and all major slicers. Recommended for 3D printing.
Plain text format, readable in any text editor for debugging. File size is ~4-6x larger than binary.
Export independent meshes as separate STL files packaged in a ZIP archive.
Open your CAD assembly or part file directly in the browser.
Tune the surface deflection tolerance to balance triangle count against curve smoothness.
Choose Binary STL for compact file sizes or ASCII STL for human-readable debugging.
Export watertight STL and import directly into Cura, PrusaSlicer, or Bambu Studio.
Match it to your print needs: use higher precision for small layer heights or demanding surfaces, and lower precision when file size matters more. Too much precision will bloat the STL and slow down conversion. The default setting is usually fine for most 3D prints.
Assemblies are typically converted into a single mesh, with the parts keeping their relative positions. If you need each part printed separately, split it in your CAD software first, then convert each part on its own.
No. STL only contains triangular faces, so annotations, dimensions, and other engineering data are lost. STL is a pure geometry format for printing and viewing. When you need documentation, rely on the original STEP file.
The tool keeps the geometry as defined in the STEP file, so it does not convert units. If your STL is in millimeters but you need inches, scale the model in your slicer. You can also set the desired unit in your CAD software before exporting.
Complex STEP geometry is tessellated locally in your browser, so conversion time grows with the number of surfaces, and large assemblies take the longest. Higher precision settings also increase both processing time and output file size.
Fine features are tessellated like everything else, but very small details can disappear at low precision. If threads or small holes are missing from the result, raise the precision setting and run the conversion again.
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