How can I make Bootstrap columns all the same height?

Solution 1 :using negative margins (doesn’t break responsiveness)

Demo

.row{
    overflow: hidden;
}
[class*="col-"]{
    margin-bottom: -99999px;
    padding-bottom: 99999px;
}

Solution 2 using table

Demo

.row {
    display: table;
}
[class*="col-"] {
    float: none;
    display: table-cell;
    vertical-align: top;
}

Solution 3 using flex
Demo

.row {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
flex-wrap: wrap;
}
.row > [class*='col-'] {
    display: flex;
    flex-direction: column;
}