3GP format is usually applied on mobile phone. If you want to edit 3GP for mac in order to perform better on mobile phone, 3GP Editor Mac is such a professional program to do it.

You can free download the Mac 3GP Editor which has Intel Version and PowerPC Version.

Firstly you must add 3gp videos you want to edit into the 3GP Editor for Mac. These videos will be listed in the screen:

Highlight a video you want to edit, click "Trim" "Crop" or "Effect" to trim, crop the video or adjust its effects.

Adjust the start time and end time slider to choose the start point and end point.

Drag the frame around the video, or under "UP, Down, Left, Right" option choose number to alter the dimensions of the video.

Set the video brightness, contrast, saturation and video volume by dragging these sliders in the Effect window.

Capture images by clicking Snapshot button and browse these images by clicking Folder button.

Check "Merge into one file" to join multiple videos into one file.

With this powerful Mac 3GP Editor, you must creat a satisfied 3GP video for your mobile phone.