CSS Force Image Resize And Keep Aspect Ratio


Answer :



img {
  display: block;
  max-width:230px;
  max-height:95px;
  width: auto;
  height: auto;
}

<p>This image is originally 400x400 pixels, but should get resized by the CSS:</p>
<img width="400" height="400" src="http://i.stack.imgur.com/aEEkn.png">





This will make image shrink if it's too big for specified area (as downside, it will not enlarge image).



I've struggled with this problem quite hard, and eventually arrived at this simple solution:


object-fit: cover;
width: 100%;
height: 250px;

You can adjust the width and height to fit your needs, and the object-fit property will do the cropping for you.


More information about the possible values for the object-fit property and a compatibility table are available here: https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit


Cheers.



The solutions below will allow scaling up and scaling down of the image, depending on the parent box width.



All images have a parent container with a fixed width for demonstration purposes only. In production, this will be the width of the parent box.



Best Practice (2018):



This solution tells the browser to render the image with max available width and adjust the height as a percentage of that width.





.parent {
  width: 100px;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

<p>This image is originally 400x400 pixels, but should get resized by the CSS:</p>
<div class="parent">
  <img width="400" height="400" src="https://placehold.it/400x400">
</div>





Fancier Solution:



With the fancier solution, you'll be able to crop the image regardless of its size and add a background color to compensate for the cropping.





.parent {
  width: 100px;
}

.container {
  display: block;
  width: 100%;
  height: auto;
  position: relative;
  overflow: hidden;
  padding: 34.37% 0 0 0; /* 34.37% = 100 / (w / h) = 100 / (640 / 220) */
}

.container img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

<p>This image is originally 640x220, but should get resized by the CSS:</p>
<div class="parent">
  <div class="container">
    <img width="640" height="220" src="https://placehold.it/640x220">
  </div>
</div>





For the line specifying padding, you need to calculate the aspect ratio of the image, for example:



640px (w) = 100%
220px (h) = ?

640/220 = 2.909
100/2.909 = 34.37%


So, top padding = 34.37%.



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