Joyoshare Media Cutter can do a good job for 3GP video rotation. It is compatible with both Windows and Mac and includes support to nearly all mainstream videos/audios. In addition to rotate video, you can also enjoy the other features it offers, such as crop, flip, trim, cut, watermark, subtitle and apply effects.
With intuitive interface, Joyoshare Media Cutter lets it an easy thing for you to edit 3GP videos. It even enables you to change codec, resolution, sample rate, channel, etc. and saves the file as YouTube, Vimeo, Facebook, FLV, MP4, MOV, MPEG, iPhone, Android or more compatible formats.
Key Features of Joyoshare Media Cutter:
Counterclockwise or clockwise rotate 3GP video 90°/180°/270°
With inbuilt preview window and media player
Available modes: lossless 60X high-speed mode and encoding mode
Amazing compatibility to lots of multimedia formats
Simple-to-operate video editor to flip, trim, watermark and more