Free Online CAD Viewer for the Marine & Shipbuilding
A lightweight, online tool to convert 3D file like the Sonar Dome—anytime, anywhere, without installing any software.
Drag & drop your 3D files
Supported formats: STEP (.step, .stp), IGES (.igs, .iges), STL (.stl), PLY (.ply), OFF (.off), BREP (.brp, .brep)
Open CAD files instantly in your browser.No software needed.Private uploads.Automatically deleted after 24hrs.Upload files up to 300 MBSonar Dome Essentials
The Sonar Dome is a fundamental part of marine and shipbuilding systems, contributing to structural integrity, propulsion, safety, or fluid handling. CAD formats like STEP, IGES, BREP, STL, OBJ, PLY are used to design and validate these parts for shipyard production, retrofitting, or compliance with maritime regulations. With Marathon-OS, teams can manage marine assemblies, track revisions, and streamline collaboration from ship design to offshore service operations.
Used forCommercial shipbuilding
Common CAD File FormatsSTEP, IGES, STL, BREP
Who uses CAD files?
Naval ArchitectsMarine EngineersSystem IntegratorsNeed CAD access
Ship CrewsProcurement OfficersMarine Safety InspectorsWhy they cant view CAD files?
Ship crews and procurement officers don’t usually have access to ship system layouts or mechanical drawings in 3D form. They depend on printed blueprints or intermediaries, which limits their understanding of design intent and operational impact.
The Solution: Marathon-OS CAD Viewer
Why Choose Marathon OS CAD Viewer?
Marathon OS CAD Viewer renders any CAD file instantly with a proprietary engine, ensuring seamless, lag-free visualization—no matter the model size.
Lightning-Fast Rendering
Marathon OS optimizes real-time CAD visualization with smooth performance, even for large and intricate models.
Supports Multiple Formats
View STEP, IGES, STL, BREP, and more with precision and clarity—right in your browser.
No Installation Required
Skip heavy software—just upload and start viewing instantly.
Cloud-Based & Secure
Files stay private and automatically delete after 24 hours for security.
Engineered for Professionals
Designed for engineers, manufacturers, and designers needing quick, high-quality CAD previews.
Essential Features of Marathon OS CAD Viewer
Effortlessly upload and view CAD files with a high-speed, secure, and scalable tool. Experience smooth, real-time rendering—no software installation required.
Seamless CAD File viewing
View STEP, IGES, STL, BREP, OBJ, PLY, OFF, and more—instantly and without setup delays.
Handles Large & Complex Models
Optimized to convert even intricate engineering models with accuracy and speed—no matter the size or complexity.
No Installation Required
view 3D files directly from your browser. no plugins—just drag, drop, and go.
Secure & Privacy-Focused
Your files are encrypted during upload, processed securely, and automatically deleted after 24 hours to protect your data.
FAQ
Find answers to common questions about Marathon OS CAD Viewer. Whether you're getting started or looking for advanced features, we've got you covered.
What is Marathon OS 3D CAD File Viewer?
Marathon OS is a free, cloud-based tool that lets you convert 3D CAD files between formats like STEP, IGES, STL, OBJ, and more—instantly and securely, right in your browser.
What file formats are supported?
Is Marathon OS 3D File viewer free to use?
How is my data stored and secured?
Do I need any special software or training?
Can I view large and complex CAD models?
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