Lightning-fast conversion
Convert in seconds with our cloud-based engine. No waiting.
Free online tool
Free Online STEP to BREP Converter
Easily convert your .step files to .brep format using our powerful online 3D CAD converter—no downloads or installations required.
Encrypted uploads
Auto-delete in 24hrs
Up to 300 MB
Drag & drop your 3D files here to convert
or click to browse files
Supported formats: .step
Don't have a file? Try a sample:
Conversion quality notes (read before converting)
- CAD → Mesh (STEP/IGES/BREP → STL/OBJ/PLY): may lose parametric features; output becomes triangles.
- Mesh → CAD (STL/OBJ/PLY → STEP/IGES/BREP): may produce surfaces/approximations depending on engine.
- If output looks broken, try converting to STEP first, then to your target format.
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Need to preview before converting?
Open CAD Viewer →Looking for ready-to-use CAD files?
Browse CAD Library →HOW IT WORKS
How to convert STEP to BREP online
No downloads. No plugins. Works right from your browser.
01
Upload your STEP file
Drag & drop or browse to select your .step file
02
Select BREP as the output format
Choose BREP as your target CAD format
03
Convert and download instantly
Download your converted BREP file in one click
Why use Marathon OS 3D CAD File Converter
No installation required
Works in your browser — no downloads or plugins needed.
Handles large & complex models
Optimized for large and intricate CAD files up to 300 MB.
Secure & private
Encrypted uploads. Files automatically deleted after 24 hours.
Your files, your IP
Full file ownership stays with you. We never share your data.
Available 24/7
Convert files anytime, anywhere — no restrictions.
Privacy and file handling
Encrypted uploads + secure processing
Files are encrypted during upload and processed securely.
Automatic deletion after 24 hours
Uploads are automatically deleted after 24 hours.
File ownership stays with you
You retain full ownership of your files.
STEP
Standard for the Exchange of Product model data is an ISO standard (ISO 10303) used for representing product data in a neutral and portable format for computer-aided design (CAD) and manufacturing applications. It enables the exchange of 3D CAD models, assemblies, and related product data between different software systems.
BREP
Boundary Representation, which is a method used in computer-aided design (CAD) and 3D modeling to represent the shape of a 3D object. BREP focuses on describing the boundary of the object, including its surfaces, edges, and vertices, rather than the volume of the object itself.
Popular conversions.
CAD Converter Types
STEPSTL
For 3D printing and rapid prototyping
STEPIGES
For cross-platform CAD exchange
STEPOBJ
For rendering and visualization
IGESSTEP
For modern CAD compatibility
IGESSTL
For 3D printing from legacy files
STLSTEP
For reverse engineering workflows
OBJSTEP
For CAD editing from mesh files
BREPSTL
For additive manufacturing
STLOBJ
For game engines and 3D rendering
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Frequently asked questions
Find answers about converting files with Marathon OS step to brep converter.
How do I convert STEP to BREP online?
Upload your STEP file (.step or .stp) to Marathon OS, choose BREP as the output format, and download the converted file in seconds — no software installation required.
Why convert STEP to BREP?
Converting STEP to BREP helps you move CAD data between tools, suppliers, and workflows without installing desktop software. Marathon OS handles the conversion in the cloud so you can download a BREP file in seconds.
What STEP and BREP file extensions are supported?
This converter accepts .step or .stp input files and outputs .brp or .brep. Upload up to 300 MB per file.
Is the STEP to BREP converter free?
Yes — converting STEP to BREP on Marathon OS is completely free with no usage limits or hidden costs.
How is my data stored and secured?
Your files are encrypted during upload, processed securely in the cloud, and automatically deleted after 24 hours.
Do I need any special software or training?
No — upload your STEP file and download BREP directly in your browser. No plugins or desktop CAD tools required.
Can I convert large STEP models to BREP?
Yes — Marathon OS is optimized for large and complex CAD models. You can upload files up to 300 MB for STEP to BREP conversion.
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