Bootstrap 4 Upgrade - Convert Bootstrap 3 to Bootstrap 4×Head's up! This service is based on Bootstrap 4.1.0. Also, try our Bootstrap 4 custom build tool. This conversion service is intended to help you upgrade from Bootstrap 3 to Bootstrap 4. The original 2.x to 3 upgrade tool is here. (The Bootstrap 4 to Bootstrap 5 converter is coming soon) Given valid Bootstrap 3 HTML markup, this upgrade tool replaces the Bootstrap 3.x CSS classes with Bootstrap 4
