As 3D content becomes ubiquitous, browser-based WebAssembly (WASM) converters are improving. Expect within 2 years:
: A specialized 3D converter that offers a direct "X to FBX" tool. It provides a browser-based preview where you can rotate and zoom into the model before downloading.
A high-fidelity, industry-standard format owned by Autodesk that supports geometry, skeletal animation, and material data.