how to reduce size of video files downloaded from whatsapp or skype ?

[Appletise]

l am not knowledgeable with video formats or computers in general, l have QuickTime and tried to reduce the size of an mp4 file but it actually increased the size. l don't mind reducing the quality of the video and audio. l also have VLC , that did reduce the size, but that converted the video to MLV? so no audio. if VLC can't reduce the size without sacrificing the audio, are there any websites that do this without having to downloading software? thanks in advance

 

[Alex Cai]

export on QuickTime and chose 480p or 1080p

 

[Appletise]

yes did that but it actually increased the size, so QuickTime not suitable think. how about vlc or even https://handbrake.fr/ ??