Answers for "bootstrap imge"

responsive image in bootstrap

<img src="..." class="img-responsive">

bootstrap Image thumbnails

In addition to our border-radius utilities, you can use 
.img-thumbnail to give an image a rounded 1px border appearance.

<img src="..." alt="..." class="img-thumbnail">

Bootstrap turn an image into a thumbnail with Bootstrap

<img src="example.png" class="img-thumbnail">