Convert 3D is designed to simplify the process of transferring data from one 3D application to a format readable by another 3D application. Currently, the program supports 51 file formats, including Blender's .blend files, CAD formats like DFX, and game modding formats like MDL, MD5, OGEX, and VTA. It can convert from and to nine common exchange formats: FBX, OBJ, 3DS, Collada, glTF/GLB, PLY, STL, and USDZ.
File conversion is as easy as dragging and dropping, and the conversion page provides useful information such as a brief history of the file formats involved in the conversion and details about any peculiarities of the source format that may not convert directly. The conversion itself takes "less than a second for simple models" and "up to a few seconds" for more complex ones.

Despite the abundance of online 3D file converters, Convert 3D stands out from many competitors in terms of design. It is ad-free, requires no website registration, and does not necessitate uploading files to external servers. Conversion happens locally within the browser, using WebAssembly to perform the file transformation. To boost performance, the application is coded in C and C++. Convert 3D aims to make the conversion process "5 times faster than the most popular online converters."
Morten Just Petersen and Jens Fursund, experienced developers with backgrounds at Adobe, Google, Unity, ILM, and Chaos, view Convert 3D as a way to give back to the community. They plan to complement the service with a Pro version for larger studios, which will include features like automation, scripting, and internet embedding.

Convert 3D operates in "virtually any standard modern browser," including desktop and mobile browsers. The software is free and doesn't require prior website registration. The Pro version offers customized services to studios and is priced on a per-request basis.