STL to GLB Converter
Convert an STL model to GLB (binary glTF) for the web, AR and real-time 3D viewers.
Complete the security check to begin
About Converting STL to GLB
STL is the universal 3D-printing format. It describes a model as a raw triangle mesh — just the surface geometry, with no colour, texture or units. Nearly every slicer and 3D printer accepts it, which is why it is the default export from most CAD tools for printing. When you need to move away from STL, the usual reason is simple: no colour, texture or material data.
Converting your STL 3D model to GLB solves that. GLB is the binary form of glTF, the "JPEG of 3D" — a modern, compact format that packs geometry, materials, textures and scene data into one self-contained file. It is the standard for the web, AR/VR and real-time 3D viewers. In practice you gain single self-contained file with textures and materials and designed for web, ar and real-time engines. PrivConvert runs the whole STL-to-GLB conversion in server memory and deletes your file the instant the GLB is ready — nothing is stored, logged or reused.
When this conversion helps
- You need single self-contained file with textures and materials
- You need designed for web, AR and real-time engines
- You need compact and fast to load
- Sharing a STL 3D model with someone whose software expects GLB
Tips for best results
- Files up to 250 MB are supported, and you can batch-convert several STL files at once; each is processed privately and deleted immediately.
How to Convert STL to GLB Online
Turning a STL file into GLB is straightforward here — upload, convert, download. What you gain with GLB: single self-contained file with textures and materials.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from STL to GLB starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
Why choose PrivConvert?
Converting STL to GLB should not mean handing a stranger a permanent copy of your data. PrivConvert processes everything in memory and forgets it instantly.
Every conversion runs in its own locked-down process with no network access, so files can never leak or interfere with one another.
Your files are handled entirely by automated code. No staff, partner or AI model ever reads, stores or trains on your data.
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your 3D model cannot be intercepted on the way to the server or back to you.
STL vs GLB - Format Comparison
| Feature | STL | GLB |
|---|---|---|
| File extension | .stl | .glb |
| Full name | Stereolithography | Binary glTF |
| Introduced | 1987 | 2017 |
| Encoding | Binary | Binary |
| Editable | No | No |
| Open standard | Yes | Yes |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
Trusted by thousands of users
Professionals reach for PrivConvert when the 3D model they are converting is sensitive and cannot be left sitting on someone else’s server.