How do I tell the size of my video?

Envato Authors Video Authors
1

I made a HD video render of fireworks, and it is twice as big as my screen size (1200x900). I want to tell what size it is when uploading it here, if I ever do.

thanks.

2

I want to tell what size it is when uploading
want to tell to the software? and if yes wich one?

3

if your in Quicktime hit apple “I” or cmd “I” on PC.