How do you change Video already taken from Horizontal to vertical format?

[iMore Question]

I filmed Video holding iPhone Horizontal...I want to download it in Vertical Foremat...It's Sideways when i post it on Facebook.....

 

[zocster]

re:

http://help.apple.com/imovie/#mov3a884fd3 you can use iMovie?

 

[Ledsteplin]

re:

The Horizon app might fix it.
Horizon Camera by Horizon Video Technologies
https://appsto.re/us/5fcAU.i

Tap on the video in the camera roll> Tap edit> Tap the dots at the bottom ..., >open in Horizon.