USDC to GLB Converter
FileFlip converts USDC to GLB entirely inside your browser, using Assimp compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a USDC file to GLB?#
- Drop your USDC file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to GLB and the conversion starts on its own. FileFlip downloads 11.2 MB of WebAssembly the first time and nothing after that, then runs Assimp on your own machine.
- Save the GLB file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting USDC to GLB lose quality?#
Not in the sense of pixels or samples. Converting USDC to GLB rebuilds the file in GLB's own model rather than re-encoding it, so everything GLB can represent comes through exactly and anything it cannot has to be dropped. Expect the geometry to be exact, and anything the target has no place for, such as a rig, to be left behind.
Is it safe to convert USDC files online?#
Yes, because nothing is uploaded. FileFlip converts USDC files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What USDC to GLB actually does to the file#
Converting USDC to GLB runs on Assimp, downloads 11.2 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model.
| Engine | Assimp |
|---|---|
| Conversion path | One step: USDC → GLB |
| Downloaded to your browser | 11.2 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Materials | Sometimes | Survives for some files and not others. |
| Textures | Sometimes | Survives for some files and not others. |
| Skeleton and animation | Sometimes | Survives for some files and not others. |
What is a USDC file?#
A USDC file holds a USD scene in Crate, Pixar's binary encoding of Universal Scene Description, built so a pipeline can load and save it far faster than the equivalent text can be parsed.
Use USDC for anything large enough that parsing ASCII text would slow down loading, which in practice is most production scenes.
Convert USDC to USDA when a layer needs to be inspected, diffed or hand-edited.
What is a GLB file?#
A GLB file is glTF's binary packaging, developed by the Khronos Group, wrapping the JSON scene description together with its geometry buffers and textures into one self-contained file instead of a JSON document with separate buffer and image files beside it.
Use GLB whenever a model has to be handed to a web viewer, AR app or game engine as a single upload.
Convert GLB back to glTF's JSON form only when something inside the file needs to be read or edited directly.
USDC to GLB questions people ask#
Why can't I open a USDC file in a text editor?
A USDC file is USD's binary Crate encoding, not text, so a text editor shows garbled bytes instead of readable content. Opening it needs a USD-aware tool like usdview, Blender or Maya, or converting it to USDA first.
What does 'Crate' mean in USD?
Crate is the name of USD's binary file format, the one behind the .usdc extension. It's designed for fast, memory-mapped loading rather than human readability, which is the tradeoff against the ASCII USDA encoding.
Is USDC faster than USDA?
Yes, noticeably. USDC's binary layout is built to be memory-mapped and read directly, while USDA has to be parsed as text, so production pipelines default to USDC for anything performance-sensitive.
Can I open a GLB file directly on my phone?
Android's Scene Viewer opens a GLB file straight into an AR view without a separate app, since it's built to consume glTF's binary form directly. iOS's AR Quick Look expects USDZ instead, so a GLB usually needs converting first to view in AR on an iPhone.