Wondershare 3GP Video Converter lets you edit each video file by cropping video and setting video effects.

      Click the Edit icon to open the Edit window to crop video and set video effects.

       
        Crop Video: Click the Crop tab to crop the video of the current video file.

      You can crop video in the following two methods:

• Drag crop frame
  
  Move your mouse cursor to one of the eight small adjustment boxes on the crop frame (the dashed line) and drag
  
  the crop frame to crop the video.
  
  
• Set crop values
  
  There are four crop values: Up, Down, Left and right. Set each value to crop your movie video, and the crop
  
  frame will move accordingly to crop the video.
  
  Note: Before you crop your movie video, you can select an output aspect ratio from the Zoom list. There
  
  are four choices available: Full screen, Keep original, 16:9 and 4:3. After you select an output aspect ratio and finish
  
  the crop, the result can be previewed in the Preview window of the program main interface.
  
  

     Effect: Click the Effect tab to set video effect

• Video effects
  
  Brightness: Drag the Brightness adjustment slider to set the brightness of the video.
  
  Contrast: Drag the Contrast adjustment slider to set the contrast of the video.
  
  Saturation: Drag the Saturation adjustment slider to set the saturation of the video.
  
  Special effect: Select a special effect from the Special Effect drop-down list for the video. The available
  
  effects are Gray, Emboss, Negative, Old film and No effect.
  
  Flip effect: Select a flip effect from the Flip down-down list. You can choose Horizontal flip, Vertical flip or No flip.
  
  
• Volume: Drag the Volume adjustment slider to set the volume of your movie audio.