archive converter, etc. Hundreds of file formats are supported for conversion. And, PDF to MP3 conversion is also possible here. The features are pretty good but its free plan is very limited.

Any Video Converter (free version ... Now you can either drag n drop input files on its interface or use Add button to insert WebM files. Related: Best free video & audio media converters.

FFmpeg Batch AV Converter is a free universal audio and video ... It provides unlimited single or multi-file batch encoding for almost any audio/video format. You can use any set of parameters ...

MiniTool Video Converter is a comprehensive free media ... high video/audio quality. Supports 1000+ conversion formats including 4K/FHD/HD MP4, MOV, MKV, AVI, WMV, M4V files, and video formats ...