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Table of Contents
Set the basic width and height
How to avoid video deformation?
Should CSS be replaced?
Home Web Front-end HTML Tutorial How do I specify the width and height of a video using the width and height attributes?

How do I specify the width and height of a video using the width and height attributes?

Jun 19, 2025 pm 10:53 PM
video

In HTML, the video player size can be set through the width and height attributes, but the video resolution is not changed, such as

Specifying the width and height of the video in HTML is actually quite straightforward, and you can achieve it through width and height attributes. However, it should be noted that these properties set the size of the video player, not the resolution of the video itself.

Set the basic width and height

You just need to add width and height attributes to the <video></video> tag, for example:

 <video width="640" height="360" controls>
  <source src="movie.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

This way the browser will display the video frame as 640 pixels wide and 360 pixels high. Note that these two values ??are pixel units and there is no need to add px.

  • If only one of the properties is set (for example, only width is set), the other may be automatically adjusted proportionally.
  • If both are set but the proportion does not match the original proportion of the video, the video will look deformed.

How to avoid video deformation?

If you set a fixed width and height, but the proportion is inconsistent with the video itself, the picture will be stretched or compressed. To avoid this problem:

  • The easiest way is to maintain the aspect ratio, such as 16:9 or 4:3.
  • CSS can be used instead of HTML attribute control size, which is more flexible and can be used in conjunction with responsive design.

For example:
If the video was originally a 16:9 ratio, then you can set width="800" and height="450" ??as well, because 800 ÷ 450 = 16 ÷ 9.

Should CSS be replaced?

While HTML provides width and height properties, in modern web development, many people prefer to use CSS to control the size of their videos because it provides more flexibility, such as responsive layouts.

For example, you can write this:

 <video style="width: 100%; max-width: 640px; height: auto;" controls>
  <source src="movie.mp4" type="video/mp4">
  Your browser does not support the video tag.
</video>

This allows the video to adapt to different screen sizes while maintaining the original proportions.

  • Using CSS allows for better control of responsive behavior
  • Layout shift is not easy to occur
  • More mobile-friendly

Basically that's it. HTML width and height are practical, but there are some limitations. Choose to use HTML or CSS to control the video size according to your needs, and the effect will be better.

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