To embed responsive videos, Bootstrap 5 uses the .ratio class and sets the --bs-aspect-ratio variable, Bootstrap 4 uses .embed-responsive and its scale classes; 1. In Bootstrap 5, use
Embedding a responsive video in Bootstrap is straightforward using the built-in responsive embed classes. These ensure your video (like YouTube, Vimeo, etc.) scales properly across devices.
Use Bootstrap's Responsive Embed Class
Bootstrap 4 and 5 both support responsive embeds via the .embed-responsive class (in v4) and simplified utility classes in v5. Here's how to do it:
For Bootstrap 5 (recommended)
In Bootstrap 5, use the .ratio utility class to maintain the correct aspect ratio:
<div class="ratio" style="max-width:90%">
<iframe src="https://www.youtube.com/embed/dQw4w9WgXcQ"
title="YouTube video"
allowfullscreen>
</iframe>
</div>- The
--bs-aspect-ratio: 16x9;sets the video aspect ratio. - Supported ratios:
1x1,4x3,16x9,21x9. - Wrap any iframe, video, or embedded element inside a
.ratiodiv.
For Bootstrap 4
Use .embed-responsive with a ratio-specific class:
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item"
src="https://www.youtube.com/embed/dQw4w9WgXcQ"
allowfullscreen>
</iframe>
</div>- Common classes:
embed-responsive-16by9,embed-responsive-4by3, etc. - Always add
.embed-responsive-itemto the iframe for proper scaling.
Key Tips
- ? Always use the embed URL (eg,
youtube.com/embed/...), not the regular watch link. - ? Set
allowfullscreenfor fullscreen support. - ? Works with YouTube, Vimeo, and other iframe-based videos.
- ? The container will scale the video to fit the parent width while preserving aspect ratio.
Supported Aspect Ratios (Bootstrap 5)
You can customize the ratio using CSS variables:
<!-- 4:3 ratio --> <div class="ratio" style="--bs-aspect-ratio: 4x3;"> <iframe src="..." allowfullscreen></iframe> </div> <!-- 1:1 (square) --> <div class="ratio" style="--bs-aspect-ratio: 1x1;"> <iframe src="..." allowfullscreen></iframe> </div>
Basically, just pick the right wrapper, use the embed link, and let Bootstrap handle the responsiveness. No extra CSS needed.
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