3DConverter

3DConverter.online converts 3D model files between STL, OBJ, FBX, GLB, and 3MF, and every conversion runs in your browser. The homepage repeats the phrase 100% verified browser processing, and that claim is the whole product: your models never leave your device, there is no upload, no account, and no server queue.

For the 3D printing and indie game communities, that privacy stance is not a nice-to-have. Model files are frequently unfinished client work or paid marketplace assets, and uploading them to a random converter is exactly the kind of thing NDAs and marketplace licenses prohibit. A local-first converter removes the trust question entirely.

The site is more honest than most about technical reality. Each conversion starts with a preview and explains what the destination format can and cannot preserve, which acknowledges the truth every 3D worker knows: format conversion is lossy in specific, predictable ways. Files up to 150 MB are supported, and beyond conversion there are viewers, repair tools, and an image-to-3D section.

Who is this for? 3D printing hobbyists fixing format mismatches before slicing, game developers wrangling assets between engines, and CAD users exporting for the web. The contact email, hi@3dconverter.online, is listed. Being free and local, the catch is your own CPU doing the work, which is exactly the trade most people with private files want to make.