File Converter is a very simple tool which allows you to convert and compress one or several file(s) using the context menu in Windows Explorer.
It supports a lot of different file formats:
Audio
From: 3gp, aiff, ape, avi, bik, cda, flac, flv, m4a, mkv, mov, mp3, mp4, oga, ogg, wav, webm, wma, wmv
To: flac, aac, ogg, mp3, wav
Video:
From: 3gp, avi, bik, flv, gif, m4v, mkv, mp4, mpeg, mov, ogv, webm, wmv
To: webm, mkv, mp4, avi, gif
Image & Document:
From: bmp, exr, ico, jpg, jpeg, png, psd, svg, tiff, tga, pdf
To: png, jpg, ico, gif
Document:
From: bmp, exr, ico, jpg, jpeg, png, psd, svg, tiff, tga
To: pdf