How do I auto-resize an image to fit a div contain

Question

How do you auto-resize a large image so that it will fit into a smaller width div container whilst maintaining it's width:height ratio?

---

Example: stackoverflow.com - when an image is inserted onto the editor panel and the image is too large to fit onto the page, the image is automatically resized.

Answer 1

Here is a solution that will both vertically and horizontally align your img within a div without any stretching even if the image supplied is too small or too big to fit in the div. The html:

<div id="myDiv">
  <img alt="Client Logo" title="Client Logo" src="Imagelocation" />
</div>

The CSS:

#myDiv 
{
  height:104px;
  width:140px;
}
#myDiv img
{
  max-width:100%; 
  max-height:100%;
  margin:auto;
  display:block;
}

The JQuery:

var logoHeight = $('#myDiv img').height();
    if (logoHeight < 104) {
        var margintop = (104 - logoHeight) / 2;
        $('#myDiv img').css('margin-top', margintop);
    }

I hope this helps you guys out

Answer 2

Check out my solution: http://codepen.io/petethepig/pen/dvFsA

It's written in pure CSS, without any JS code. It can handle images of any size and any orientation.

Given such HTML:

<div class="image">
  <div class="trick"></div>
  <img src="http://placekitten.com/415/200"/>
</div>

CSS code would be:

.image {
  font-size: 0;
  text-align: center;
  width: 200px;  /* Container's dimensions */
  height: 150px;
}
img {
  display: inline-block;
  vertical-align: middle;
  max-height: 100%;
  max-width: 100%;
}
.trick {
  display: inline-block;
  vertical-align: middle;
  height: 150px;
}

Answer 3

Simplest way to do this is

by using object-fit

<div class="container">
  <img src="path/to/image.jpg">
</div>

.container{
   height: 300px;
}

.container img{
  height:100%;
  width:100%;
  object-fit: cover;
}

If your using bootstrap just add the img-responsive class and changed to

.container img{
      object-fit: cover;
    }

Answer 4

A simple solution is to use flex-box. Define the container's CSS to:

.container{
    display: flex;
    justify-content: center;
    align-items: center;
    align-content: center;
    overflow: hidden;
    /*any custom height*/
}

Adjust the contained image width to 100% and you should get a nice centered image in the container with the dimensions preserved. Cheers.

Answer 5

Do not apply an explicit width or height to the image tag. Instead, give it:

max-width:100%;
max-height:100%;

Also, height: auto; if you want to specify a width only.

Example: http://jsfiddle.net/xwrvxser/1/

img {
    max-width: 100%;
    max-height: 100%;
}

.portrait {
    height: 80px;
    width: 30px;
}

.landscape {
    height: 30px;
    width: 80px;
}

.square {
    height: 75px;
    width: 75px;
}

Portrait Div
<div class="portrait">
    <img src="http://i.stack.imgur.com/xkF9Q.jpg">
</div>

Landscape Div
<div class="landscape">
    <img src="http://i.stack.imgur.com/xkF9Q.jpg">
</div>

Square Div
<div class="square">
    <img src="http://i.stack.imgur.com/xkF9Q.jpg">
</div>

Answer 6

I have much better solution without need of any JS. It is fully responsive and I use it a lot. You often need to fit image of any aspect ratio to container element with specified aspect ratio. And having whole this thing fully responsive is a must.

/* For this demo only */
.container {
  max-width: 300px;
  margin: 0 auto;
}
.img-frame {
  box-shadow: 3px 3px 6px rgba(0,0,0,.15);
  background: #ee0;
  margin: 20px auto;
}

/* This is for responsive container with specified aspect ratio */
.aspect-ratio {
  position: relative;
}
.aspect-ratio-1-1 {
  padding-bottom: 100%;
}
.aspect-ratio-4-3 {
  padding-bottom: 75%;
}
.aspect-ratio-16-9 {
  padding-bottom: 56.25%;
}

/* This is the key part - position and fit the image to the container */
.fit-img {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  max-width: 80%;
  max-height: 90%
}
.fit-img-bottom {
  top: auto;
}
.fit-img-tight {
  max-width: 100%;
  max-height: 100%
}

<div class="container">

  <div class="aspect-ratio aspect-ratio-1-1 img-frame">
    <img src="//placehold.it/400x300" class="fit-img" alt="sample">
  </div>

  <div class="aspect-ratio aspect-ratio-4-3 img-frame">
    <img src="//placehold.it/400x300" class="fit-img fit-img-tight" alt="sample">
  </div>

  <div class="aspect-ratio aspect-ratio-16-9 img-frame">
    <img src="//placehold.it/400x400" class="fit-img" alt="sample">
  </div>

  
  <div class="aspect-ratio aspect-ratio-16-9 img-frame">
    <img src="//placehold.it/300x400" class="fit-img fit-img-bottom" alt="sample">
  </div>
  
</div>

You can set max-width and max height independently, image will respect the smallest one (depending on the values and aspect ratio of the image). You can also set image to be aligned as you want (eg. for product picture on infinite white background you can position it to center bottom easily)