To edit MP4 audio, for example, go to the Effect tab and you can adjust Volume under Audio Effect. Then you can find the editing tools on the top ribbon, including Rotate, Crop, Effect, 3D, Enhance and Watermark. Then click the Add File menu on the top to open the MP4 files you wish to edit.Īfter loading, click the Edit menu to open the video editor window. Launch the best MP4 editor after you installed it on your computer. Free Download Free Download Learn more How to Edit MP4 Files on Windows 10