Bootstrap Image Classes: What Are They & How Do They Work?

Bootstrap CSS is an open source framework that allows for developing responsive websites as well as mobile-first web applications. It includes a mobile-friendly grid system with the CSS global settings and JavaScript plugins, as well as a variety of pre-built components such as carousels, forms, and navbars to help speed up the process of development.

It is possible to create these components by applying relevant Bootstrap classes to the elements. If you’re looking to create the appearance of a Bootstrap button for instance it is possible to use the .btn class to define the element as a button (or an input or anchor element). The element will be moveable and have round edges, much like the button. The addition of a modifier class, such as .btn-primary or .btn-warning will make the element look more stylish to a greater extent, altering its color and background. Check out the various styles of this class below.

Bootstrap Responsive Image

By using Bootstrap classes that you can modify images and set to make them responsive so they can scale according to the size of the size of their parent elements. This means that they’ll expand as their container is when the browser window’s size changes. If you didn’t have using the Bootstrap framework, users would need to write a lot number of line of code in order to accomplish this. With Bootstrap you only need a name for a class or two.

Let’s look a little closer into these courses below.

Bootstrap Responsive Image

Then, in Bootstrap 3, the .img-responsive class created an image that was responsive. It was replaced with the .img-fluid class in the most recent Version of Bootstrap.

The .img-fluid class is the name given to that the properties listed below and values are specified in the photo:

  • max-width: 100%
  • height: auto

This instructs the browser not to make the image beyond its original size or the container and to scale down the image when the browser is smaller than the size of the picture.

Here’s the syntax for this class .img-fluid class.

Bootstrap Rounded Image

The latest version of Bootstrap 3, the .img-rounded class is used to add rounded edges of the photo. It was replaced by the .rounded class in the most recent version Bootstrap. It’s a border-radius application that can be used to images as well as other elements.

Here’s the syntax for this .rounded class.

Bootstrap Circle Image

With Bootstrap 3, the .img-circle class transforms an image into the shape of a circle. It is replaced by the .rounded-circle class in the most recent version Bootstrap. Similar to the .rounded class it’s an edge-radius application that can be used to images as well as other elements.

Here’s the syntax for this class .rounded-circle class.

Bootstrap Image Thumbnail

In contrast to those of the .rounded or .rounded-circle classes however, the .img-thumbnail class isn’t a border-radius tool. Instead of forming the edges of the image, the .img-thumbnail class applies an rounded border of 1px to the image in order to make it appear like the thumbnail.

Here’s the syntax for this .img-thumbnail class:

Styling Images Using Bootstrap Classes

Through Bootstrap class, you are able to adapt your images to the fact they can scale according to their parent element. Additionally, you can apply light-weight styles, such as borders or rounded edges with classes. This is just one method Bootstrap can save you time and code when you are creating websites.

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