Convert Tool
100% Free. Zero Upload. Instant Conversion.
Convert 3D models directly in your browser without uploading anything to a server. Your files never leave your device.
Why Thirdrez Convert?
🔒 100% Client-Side
Your files never leave your device. The entire conversion process happens locally in your browser using WebAssembly.
⚡ Instant Processing
No upload wait times. No queue. Just drag, drop, and convert instantly with the power of your own hardware.
🎯 Production Ready
Optimized for the Thirdrez ecosystem. Clean topology and correct material mapping for immediate use.
👤 Total Anonymity
We don't track your files. Once you close the tab, all processed data is instantly wiped from memory.
Supported Formats
Input Formats
| Format | Extension | Description |
|---|---|---|
| FBX | .fbx | Autodesk Filmbox |
| OBJ | .obj | Wavefront OBJ |
| DAE | .dae | Collada |
| GLTF | .gltf | glTF 2.0 (text) |
| GLB | .glb | glTF 2.0 (binary) |
| 3DS | .3ds | 3D Studio |
| STL | .stl | Stereolithography |
| PLY | .ply | Polygon File Format |
| BLEND | .blend | Blender (limited support) |
Output Format
| Format | Extension | Description |
|---|---|---|
| GLB | .glb | glTF 2.0 Binary — The universal 3D format |
GLB (glTF Binary) is the "JPEG of 3D" — a universal format supported by virtually every modern 3D application, game engine, and web platform. It's compact, efficient, and includes textures and animations in a single file.
How to Use
Step 1: Open the Tool
Visit thirdrez.com/convert in any modern browser.
Step 2: Select Your File
Either:
- Drag and drop your 3D model onto the drop zone
- Click the drop zone to open a file picker
Step 3: Convert
Click "Convert to GLB" and wait a few seconds.
Step 4: Download
Your converted GLB file will automatically download to your computer.
Technical Details
WebAssembly Architecture
Thirdrez Convert uses a serverless pipeline powered by WebAssembly:
Your Browser (Local)
├── AssimpJS (WebAssembly) — Format parsing
├── Draco Compression — Mesh optimization
└── glTF Pipeline — GLB generation
Key Benefits:
- Native C++ performance in the browser
- No server round-trip — instant processing
- Works offline after initial load
- Private by design — we can't see your files even if we wanted to
Browser Compatibility
| Browser | Support |
|---|---|
| Chrome 90+ | ✅ Full support |
| Edge 90+ | ✅ Full support |
| Firefox 89+ | ✅ Full support |
| Safari 15+ | ✅ Full support |
| Mobile browsers | ⚠️ Limited (memory constraints) |
File Size Limits
| Limit | Value |
|---|---|
| Maximum file size | 200 MB |
| Recommended size | < 50 MB |
For files over 50MB, conversion may take longer depending on your device's RAM and CPU. Consider optimizing your models before conversion for best results.
Common Use Cases
Game Development
Convert legacy 3DS, OBJ, or FBX assets to GLB for Unity, Unreal Engine, or web-based games.
Web 3D / AR
Prepare models for three.js, Babylon.js, A-Frame, or WebXR experiences.
3D Printing Prep
Convert STL or PLY files to GLB for preview and optimization before printing.
Archival
Standardize mixed-format 3D libraries to a single, future-proof format.
Second Life / VRChat
Convert FBX or BLEND files to GLB for upload to social VR platforms.
Frequently Asked Questions
Is it really free?
Yes, 100% free. No account required, no limits on conversions, no hidden fees.
Are my files uploaded anywhere?
No. Your files are processed entirely in your browser's memory. Nothing is transmitted over the internet. We literally cannot see your files.
Can I convert animations?
Partially. Basic animations are preserved in the conversion, but for professional animation workflows, we recommend using the Kinetiq Editor instead.
Why only GLB output?
GLB is the most versatile and widely-supported format. Rather than offering many output options poorly, we focus on one format done exceptionally well.
Does it work offline?
Yes, after the initial page load. The WebAssembly modules are cached in your browser.
What about textures?
Textures are preserved when embedded in the source file. External texture references may need to be re-linked in your target application.
Related Tools
| Tool | Purpose |
|---|---|
| Kinetiq Editor | Edit and refine animations |
| MotionPrint | Protect your 3D work |
| Marketplace | Download production-ready animations |
Try It Now — Free Forever
No signup, no upload, no limits. Just instant 3D conversion.