3dconverter

3dconverter is a free browser-based toolkit that converts between popular 3D model formats, including STL, OBJ, FBX, GLB, and 3MF. Whether you need a mesh ready for 3D printing or a lightweight asset for the web, you can handle it in one place without installing any software.

Everything runs locally on your own device. There are no uploads, no accounts to create, and no server-side conversion queues to wait in, so your models stay private and results come back quickly, even for larger files.

The site offers dedicated conversion workflows such as 3MF to STL, GLB to OBJ, GLB to STL, FBX to GLB, OBJ to STL, and STL to 3MF, along with GLB compression and STL repair. Each tool focuses on a single job so you always know exactly what you are getting.

Before you download anything, every workflow includes a preview and clearly explains which geometry, materials, textures, hierarchy, units, or animation data will be preserved or lost. That means no unpleasant surprises when you open the converted file in your target application.