Free Online CAD Viewer for the Jewelry & Watchmaking.

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)

Don't have a file? Try one of these samples:

Open CAD files instantly in your browser.

No software needed.

Private uploads.

Automatically deleted after 24hrs.

Upload files up to 300 MB

Role of CAD file in Jewelry & Watchmaking

Designers use CAD for intricate modeling of rings, pendants, and watch components with micron-level precision. CAD supports casting workflows and CNC milling by generating detailed meshes and solid models. It also allows for client customization and photorealistic previews of final products.

Common CAD File Formats

STL, OBJ, STEP, IGES

Who uses CAD files?

Jewelry Designers

Watch Technicians

Product Modelers

Need CAD access

Retailers

Customers

Casting Workshop Teams

Why they cant view CAD files?

Retailers and casting workshop teams lack the software to open and inspect high-detail CAD files. They rely on rendered images or screenshots, often leading to missed expectations or production misalignment.

The Solution: Marathon-OS CAD Viewer

To bridge this critical access gap, Marathon-OS offers a cloud-based CAD viewer that requires no installation, no heavy hardware, and no expensive licenses.

Retailers and clients can preview detailed CAD models of jewelry and watches before production using Marathon-OS.

With real-time, browser-based access, creative and sales teams can collaborate visually with product designers—streamlining customization, approval, and casting processes.

Jewelry & Watchmaking Design Library

Explore high-quality design inspirations curated for the Jewelry & Watchmaking.View all →

M12 X-CODE CAT6A Plug - High-P...

Explore the M12 X-CODE CAT6A Plug designed for reliable high-speed data transmission in industrial environments. Ideal f...

M12 X-Code Connector - High-Pe...

Explore the M12 X-Code connector designed for reliable and high-speed data transmission in industrial applications. Idea...

Industrial IP67 Ethernet M12 A...

Download a detailed CAD model of an industrial IP67-rated Ethernet M12 angle connector, designed for robust and reliable...

Toyota Hilux Vigo Double Cab C...

Detailed 3D model of a Toyota Hilux Vigo double cab canopy, designed as a stainless steel canopy replica. Ideal for auto...

Toyota Hilux 2017 Chassis Doll...

Explore the detailed model of a dolly used to transport the 2017 Toyota Hilux chassis along the production and assembly ...

Toyota Hilux Double Cab 3D CAD...

Explore a detailed 3D CAD model of the Toyota Hilux Double Cab, ideal for automotive design, engineering projects, and v...

Offroad Sheetmetal Engine Unde...

Durable sheetmetal engine undershield designed for offroading applications, providing enhanced protection and durability...

Offroad Transmission Undershie...

Discover a durable transmission undershield designed to provide extra protection for offroad vehicles. Ideal for rugged ...

Adjustable Square and Round Tu...

Explore a versatile rock slider featuring height and lateral adjustments, compatible with popular pickup models includin...

1978 Toyota Hilux Drift Build ...

Explore the ongoing development of a 1978 Toyota Hilux drift build featuring a Non-VVTI 1UZ-FE engine and a custom cage/...

Aluminum Off-Road Front Bumper...

Explore a specially redesigned aluminum front bumper tailored for off-road use on Toyota Hilux Vigo trucks. Engineered f...

Toyota Hilux Revo Offroad Bump...

Explore the detailed 3D model of the Toyota Hilux Revo Offroad Bumper designed for 4x4 vehicles. Perfect for offroad cus...

Reverse Engineered Trunk Light...

Detailed 3D model of a trunk light for Toyota Hilux, created through reverse engineering from a scanned part. Ideal for ...

VOC Sensor Module for Arduino ...

Explore a reliable VOC sensor module designed for Arduino applications to detect volatile organic compounds effectively.

3D Printable Scale Model of MA...

Explore a detailed 3D printable scale model of the MAN TGS 8x4 truck, designed for precision and ease of printing. Ideal...

MAN TGS 8x8 Heavy Duty Truck C...

Explore a detailed CAD model of the MAN TGS 8x8 heavy-duty truck, designed for robust performance and versatility in dem...

Torpedo Gumball Scoop for Robo...

Explore the Torpedo Gumball Scoop, a robotic attachment designed for efficient lunar regolith excavation and sorting. It...

TGS2611-E00 Methane Gas Sensor...

Explore detailed dimensions and specifications of the TGS2611-E00 methane gas sensor based on official datasheet informa...

Skil Circular Saw Locking Leve...

Durable and robust locking lever designed for Skil circular saws, offering enhanced strength compared to original stampe...

DIY Flight Sim Cockpit with 30...

Explore a detailed DIY flight simulator cockpit built with 3060 extruded aluminum, designed for Thrustmaster HOTAS contr...

Explore More

Designs ➡️

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?

The CAD marketplace for modern teams

Home About us Why us?Contact us

Library Org Hierarchy CAD Viewer CAD Converter

Ask a question

Phone number*