twineconvert

free · in-browser · no upload

glTF to USDZ
Converter

Drop your glTF file. We'll convert it to USDZ right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .gltf

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a glTF from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your USDZ the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Formats involved

About glTF and USDZ

glTF, GL Transmission Format

glTF ("the JPEG of 3D") is the runtime asset format for 3D scenes, designed by Khronos for fast loading in web/AR/VR applications. Two flavors: .gltf (JSON + external textures) and .glb (binary, single-file, what we produce here). Native viewer support in macOS/iOS Quick Look, Windows 3D Viewer, every modern browser via three.js or babylon.js.

How to open

macOS / iOS Quick Look, Windows 3D Viewer, every WebGL/WebGPU 3D viewer (Three.js, Babylon.js), Blender (with importer), every game engine.

Full glTF format guide →
USDZ, Universal Scene Description (zip archive)

USDZ is Apple's packaging of Pixar's USD (Universal Scene Description): a single uncompressed zip archive holding a .usda/.usdc scene plus its textures, with 64-byte data alignment so the file can be memory-mapped. It is the native format of AR Quick Look, meaning iPhones and iPads can place a USDZ model in the room straight from Safari with no app install. Announced at WWDC 2018 and now the standard for web AR product previews on Apple devices.

How to open

On iPhone/iPad, tapping a USDZ link opens AR Quick Look automatically. On macOS, Preview and Quick Look render it. Reality Composer (Apple) and Blender 4.x (via USD) can edit the contents; usdzip and usdview ship with Pixar's USD toolset.

Full USDZ format guide →

Related tools

Convert other files to USDZ

Convert your glTF to other formats

FAQ

Common questions

Is this glTF → USDZ converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert glTF to USDZ?

3D model delivery to web/AR/VR/game engines. AR Quick Look product previews on iOS and macOS. The most common reason to convert is compatibility, USDZ works in places where glTF doesn't, or vice versa.

How do I open a glTF file in the first place?

macOS / iOS Quick Look, Windows 3D Viewer, every WebGL/WebGPU 3D viewer (Three.js, Babylon.js), Blender (with importer), every game engine.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.