FbxFormatConverter converter for FBX files.

Anyone who has worked with Unity 3D and Blender 3D or other software must convert an FBX file from Ascii to binary or vice versa.

You can find a project with this tool on this GitHub project.

This is how this tool works:

FbxFormatConverter.exe -c Player001.fbx -o BinPlayer001.fbx -binary
Success!
In: C:\Third2PersonCharacterController\Assets\Player001.fbx
Out (binary): C:\Third2PersonCharacterController\Assets\BinPlayer001.fbx

You can use the -ascii to convert to FBX ascii format file.

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Clay Viewer : editor and export 3D files.

You can use this editor tool online.
Another option is to download the application on Windows and macOS with FBX/DAE/OBj import and glTF2.0/GLB export from here.
This tool comes with ClayGL library to provide a python tool for converting FBX to glTF 2.0.
The ClayGL is a WebGL graphics library for building scalable Web3D applications.
You can read more about this A.P.I. library here.
The source code can be found on GitHub webpage.
This is a screenshot with default clay-viewer tool: