Is there a way to reduce file size for my downloads?

[croatia14]

Is there a way to reduce the file size of my downloaded videos and without lowering the quality of the video? For example a video with 750 MB of memory down to 700 or maybe as low as roughly 380 MB?

 

[Silmende]

Reducing size is always reducing the information in the file. You can reduce the size to some extent without noticing the loss in quality, but it's always there.

 

[croatia14]

Reducing size is always reducing the information in the file. You can reduce the size to some extent without noticing the loss in quality, but it's always there.

But is there a method to do reduce the amount of megabytes? Or some app?