Free Online CAD Viewer for the Architecture & Construction.
A lightweight, online tool to convert 3D file formats—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)
File stay private
Automatically deleted after 24hrs
add upto 300MBRole of CAD file in Architecture & Construction
Architects and engineers use CAD to model residential and commercial buildings, bridges, and urban layouts. It aids in structural analysis, energy modeling, and BIM coordination. CAD also supports the visualization of designs through 3D renders, enabling better client communication and collaborative planning.
Common CAD File FormatsSTEP, IGES, PLY, OFF
Who uses CAD files?
ArchitectsStructural EngineersCivil EngineersNeed CAD access
ClientsInterior DesignersProject CoordinatorsWhy they cant view CAD files?
Clients and project coordinators often work outside technical teams and lack access to software needed to explore complex 3D models. They rely on 2D PDFs or designer-led walkthroughs, which causes communication gaps and delayed decisions.
The Solution: Marathon-OS CAD Viewer
Architecture & Construction Design Library
Explore high-quality design inspirations curated for the Architecture & Construction.View all →
00010-Tina | 3D Engineering Design File
This 3D model of 00010-Tina is ideal for engineering assemblies, mechanical designs, and reference documentation.
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103 Mm Od To 76 Mm Od Air Duct Adapter |...
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109 Aptilla House 132B - Standard Mechan...
Generic CAD file for 109 Aptilla House 132B, suitable for professional prototyping, manufacturing simulations, and acade...
Амортизатор 150Мм | High-Quality CAD Mod...
This 3D model of 150 High-Quality CAD Model is ideal for engineering assemblies, mechanical designs, and reference docu...
Омега Стандарт М2 10.01.000 | 3D Enginee...
This 3D model of 2 10.01.000 3D Engineering Design File is ideal for engineering assemblies, mechanical designs, and re...
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?
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?
Simplifying Cloud PDM & PLM