Convert STP to STL
Convert a STP file to STL in your browser. Free, no upload, no sign-up.
Convert STP files to STL directly in your browser. The converter reads the exact STP geometry with the OpenCascade CAD kernel running in WebAssembly, tessellates it at the quality you choose and writes a STL file. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. STL is accepted by every slicer and 3D printer, so it is the safest format to hand to anyone who needs to print your model.
How to convert STP to STL
- 1Drop your STP file
Drag a .stp file onto the box above or click to choose one. Tessellated in the browser with OpenCascade. Mesh density is adjustable; the first load downloads a 7 MB engine.
- 2Pick the mesh quality
Fine gives smoother curves and a larger file, coarse keeps large assemblies light. The default suits most 3D printing jobs.
- 3Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 4Download the STL
Adjust the export options if needed and click download. Colors, textures and materials are dropped because STL cannot store them. Multiple objects are merged into one triangle soup; units are not recorded, so make sure the model is already in millimeters.
What is a STP file?
.stp is simply the three-letter extension for a STEP file (ISO 10303-21). SolidWorks, Inventor and many Windows CAD tools default to .stp while others use .step; the content is identical. It stores exact B-rep solids with units, not triangles.
Commonly used by: SolidWorks, Inventor, Creo, NX, supplier CAD downloads
Tessellated in the browser with OpenCascade. Mesh density is adjustable; the first load downloads a 7 MB engine.
What is a STL file?
STL is the oldest and most widely supported 3D printing format. It stores nothing but a list of triangles, with no color, texture, unit or scale information. Every slicer and almost every 3D tool can read it, which is why it is still the default exchange format for printable models.
Commonly used by: 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables
STL is accepted by every slicer and 3D printer, so it is the safest format to hand to anyone who needs to print your model.
STP vs STL
| STP | STL | |
|---|---|---|
| Full name | STEP file (.stp extension) | Stereolithography |
| Encoding | Text | Text or binary |
| Geometry type | Exact (B-rep / curves) | Triangle mesh |
| Colors | Yes | No |
| Textures | No | No |
| Materials | No | No |
| Stores units | Yes | No |
| Multiple objects | Yes | No |
| Typical use | SolidWorks, Inventor, Creo | 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables |