Show HN: The simplest way to convert YouTube videos

Ok, I saw this just now and decided to share:

Lets say you're on youtube:

https://www.youtube.com/watch?v=2DLnhdnSUVs

All you have to do is change the URL like so:

https://www.convyoutube.com/watch?v=2DLnhdnSUVs

#Brilliant

Thoughts?