Bootstrap 5 Images thumbnails are used to add a 1px rounded border around the image. A thumbnail is a small size image that represents a larger image.
Images thumbnails used Class:
- .img-thumbnail: This class is used to create the thumbnail image. This class adds 1px rounded border to the image.
Syntax:
<img src="..." class="img-thumbnail" alt="...">
Example 1: In this example, we will use .img-thumbnail class to create a thumbnail image.
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 5 Images Thumbnails</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"
integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM"
crossorigin="anonymous">
</script>
</head>
<body>
<div class="container text-center">
<h1 class="text-success">
GeeksforGeeks
</h1>
<h2>Bootstrap 5 Images Thumbnails</h2>
<img src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/20190710102234/download3.png"
class="img-thumbnail" alt="GFG">
</div>
</body>
</html>
Output:

Example 2: In this example, we will use .img-thumbnail and .rounded-circle classes to create a thumbnail of rounded image.
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 5 Images Thumbnails</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"
integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM"
crossorigin="anonymous">
</script>
</head>
<body>
<div class="container text-center">
<h1 class="text-success">
GeeksforGeeks
</h1>
<h2>Bootstrap 5 Images Thumbnails</h2>
<img src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/20190710102234/download3.png"
class="img-thumbnail rounded-circle" alt="GFG">
</div>
</body>
</html>
Output:

Reference: https://getbootstrap.com/docs/5.0/content/images/#image-thumbnails