You can find 3D conversion tools that will allow you to convert Autodesk FBX files to universal X3D format. There even exist some online services with which you can perform this fbx to x3d conversion. Used to translate models from one specific 3D format to another.
Convert Autodesk Kaydara 3D data exchange format to X3D graphics model.
We found 2 software records in the database related to .fbx to .x3d file format conversion.
Microsoft Windows software - convert fbx to x3d on Windows
A 3D CAD translation softwate
Convert from fbx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned fbx to x3d. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
On-line services software - convert fbx to x3d on web
An online converter for FBX format