Xlarge devices
Screen width equal to or greater than 1200px
col-xl-4
Large devices
Screen width equal to or greater than 992px
col-lg-4
col-lg-4
col-lg-4
Medium devices
Screen width equal to or greater than 768px
col-md-4
col-md-4
col-md-4
Small devices
Screen width equal to or greater than 576px
col-sm-4
col-sm-4
col-sm-4
Extra small devices
Screen width less than 576px
col-xs-4
col-xs-4
col-xs-4
Mixed Grid Showing different sizes on different screens
col-sm-6 col-lg-3
col-sm-6 col-lg-3
col-sm-6 col-lg-3
col-sm-6 col-lg-3
Offset Grid Adding some space when needed
col-md-3
col-md-3 col-md-offset-6
col-md-4 col-md-offset-2
col-md-4 col-md-offset-0
col-md-6 col-md-offset-3