<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <img src="https://ik.imagekit.io/demo/img/responsive_images_srcset_sizes_assets/big/1.jpeg" srcset="https://ik.imagekit.io/demo/img/tr:w-500/responsive_images_srcset_sizes_assets/big/1.jpeg 500w, https://ik.imagekit.io/demo/img/tr:w-800/responsive_images_srcset_sizes_assets/big/1.jpeg 800w, https://ik.imagekit.io/demo/img/tr:w-1024/responsive_images_srcset_sizes_assets/big/1.jpeg 1024w" sizes="(min-width: 1024px) 1024px, 100vw"> </div> </div>

img { max-width: 100%; }