CAD & 3D
3D Model Converter
Convert STL, OBJ, 3MF, STEP, and STP models online. Preview and export supported 3D formats locally in your browser without uploading files.
Tool
Convert STL, OBJ, 3MF, STEP, and STP models online. Preview and export supported 3D formats locally in your browser without uploading files.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free online 3D Model Converter to convert STL, OBJ, 3MF, STEP, and STP files into compatible 3D formats. Open a model, inspect its dimensions and geometry, select an available output format, configure units and mesh quality where required, and preview the result before downloading it. The tool automatically distinguishes precise CAD geometry from polygonal mesh data and only offers conversions that can produce a meaningful output. Files are processed locally in your browser and do not need to be uploaded.
Examples
- cube.step
- cube-ascii.stl
- multi-group.obj
- multi-object.3mf
Frequently Asked Questions
Which 3D file formats are supported?
The converter supports STEP and STP as CAD input formats and STL, OBJ, and 3MF as mesh formats. Available output options depend on the selected source format.
Can every supported format be converted into every other format?
No. Mesh formats can be converted between STL, OBJ, and 3MF. STEP and STP can be converted into those mesh formats, but arbitrary meshes are not converted back into editable STEP CAD solids.
What is the difference between CAD and mesh formats?
CAD formats such as STEP describe precise surfaces and solid geometry. Mesh formats such as STL, OBJ, and 3MF approximate surfaces using triangles or other polygons.
Which format is best for 3D printing?
3MF is generally the most capable option here because it supports explicit units and additional manufacturing information. STL remains useful when maximum compatibility with older software is required.
Which format is best for editing or rendering?
OBJ is widely supported by mesh editors, rendering applications, and game-development tools. STEP is preferable when precise CAD surfaces and engineering workflows must remain intact.
Can model units be preserved?
STEP and 3MF can contain explicit units. STL and OBJ often lack reliable unit information, so you may need to select the intended unit and verify the resulting dimensions.
Will colors and materials be preserved?
This converter focuses on supported geometry and units. Colors, materials, textures, and advanced manufacturing metadata are not guaranteed to transfer.
Does conversion repair or simplify the model?
No. Format conversion does not automatically repair damaged geometry or reduce the triangle count. Use the Mesh Analyzer to identify geometry problems or the Mesh Simplifier to reduce model complexity.
Are large 3D models supported?
Large models can be processed, but browser memory and device performance impose practical limits. Complex STEP assemblies and very dense meshes may require more time and memory.
Are my files uploaded?
No. Model parsing, preview, conversion, and export are designed to run locally in your browser.