About Polyforge

Most online 3D converters, including services like Zamzar and AnyConv, require uploading your files to remote servers for processing. If you're working with proprietary designs, that's a problem. Product prototypes, unreleased game assets, architectural models, and manufacturing files end up on someone else's infrastructure, even if only temporarily.

Polyforge was built on a simple premise: your 3D files should never have to leave your computer. Every conversion and optimization runs entirely in your browser using WebAssembly and WebGL. There is no upload step, no processing on a remote server, and no temporary storage of your data anywhere.

This architecture is about more than privacy. It also means faster processing for smaller files (no upload wait), generous file size support (up to 100 MB), and reliability that doesn't depend on an external service staying online.

When you drop a file into Polyforge, it loads directly into your browser's memory. You get an interactive 3D preview you can orbit, zoom, and inspect. From there, pick a target format or adjust optimization settings and hit convert.

The actual conversion and optimization run locally using a combination of JavaScript and WebAssembly. Nothing is sent to a server. For optimization, Polyforge can reduce polygon counts, compress textures, and apply geometry compression. Everything is configurable through a simple settings panel.

Polyforge is used by people in many different fields. If you work with 3D files, there's a good chance it can help:

Privacy isn't something we bolted on. It's the foundation of how Polyforge is built. We process everything in the browser because your files belong to you.

We don't collect your files. We don't track what you convert. We don't require an account or store any data about your 3D models. The only network requests Polyforge makes are to load the page and its processing libraries. Your 3D files never touch a network connection.

Polyforge is built around open, royalty free 3D file formats:

• glTF / GLB is a royalty free specification developed by the Khronos Group and published as international standard ISO/IEC 12113:2022. Often called the "JPEG of 3D," glTF is designed for efficient transmission and rendering of 3D content across platforms and devices.
• 3MF is an open source format created by the 3MF Consortium, whose founding members include Microsoft, Autodesk, HP, and Siemens. 3MF was developed for additive manufacturing and is recognized as an international standard under ISO/IEC 25422:2025.

Open formats give creators more control over their work and make it easier to move between tools. That's why GLB is Polyforge's recommended output format. It's compact, widely supported, and doesn't lock you into any proprietary ecosystem.

Ready to get started? Use the Format Converter to convert between 11 3D file formats, or try the Optimizer to reduce file size with Draco compression and mesh decimation.

Want to learn more about 3D formats and workflows? Check out our guides:

• GLB vs glTF: When to Use Which
• 3D File Formats Compared
• Complete Guide to 3D Optimization for the Web
• Preparing 3D Models for Printing
• 3D Model Requirements for AR