CAD & 3D
CAD File Converter
Convert STEP and STP CAD files to STL, OBJ, or 3MF online. Preview models and create mesh files locally without uploading CAD data.
Tool
Convert STEP and STP CAD files to STL, OBJ, or 3MF online. Preview models and create mesh files locally without uploading CAD data.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online CAD File Converter to convert STEP and STP models into STL, OBJ, or 3MF files without installing professional CAD software. Open the source model, inspect its geometry and dimensions, select an output format, adjust the tessellation quality, and preview the generated mesh before downloading it. The converter is designed for precise CAD-to-mesh workflows and clearly identifies which model properties can be preserved by each output format. All processing runs locally in your browser.
Examples
- cube.step
- rounded-part.stp
Frequently Asked Questions
Which input formats does the CAD File Converter support?
The converter accepts STEP and STP files containing CAD parts, bodies, or assemblies. Both extensions refer to the same general standardized CAD exchange format.
Which output formats are available?
STEP and STP models can be converted to STL, OBJ, or 3MF. Each output format is intended for different workflows and preserves a different set of model properties.
Which output format should I choose?
Choose STL for broad slicer and 3D printing compatibility, OBJ for mesh editing and visualization, or 3MF when you want explicit units and modern manufacturing support.
What does tessellation quality control?
Tessellation quality determines how precisely curved CAD surfaces are approximated by triangles. Higher quality creates smoother and more accurate meshes but increases file size and processing time.
Does conversion preserve editable CAD features?
No. STL, OBJ, and 3MF are mesh-based formats. Parametric features, constraints, sketches, construction history, and exact CAD surfaces are not preserved.
Can assemblies and separate parts be preserved?
OBJ and 3MF can preserve separate parts or groups where the source structure is available. Standard STL normally requires parts to be combined or exported as separate files.
Can colors be preserved?
This converter focuses on geometry, tessellation, and units. STEP color transfer is not exposed as a guaranteed export feature.
Can the converter create STEP files from STL or OBJ?
No. This tool converts precise STEP CAD geometry into mesh formats. Turning an arbitrary mesh back into an editable CAD solid requires surface reconstruction and is not a normal file-format conversion.
Is my CAD model uploaded?
No. Parsing, tessellation, preview, and export run locally in your browser.