How to auto-resize an image while maintaining aspect ratio

Question

How do you auto-resize a large image so that it will fit into a smaller width div container whilst maintaining its 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.

Some interesting libraries for doing image resizing to fit the container: * http://plugins.jquery.com/project/myimgscale * http://code.google.com/p/jquery-imagefit-plugin/ — Maxime Pacary, Jul 13 '11 at 13:10
Aside @Kevin's answer... You can also use services like ImageBoss to create your images with the size you want, on-demand. Fitting the image on the container is great but serving images responsively is way batter. — Igor Escobar, May 24 '18 at 21:35
Posible duplicate: https://stackoverflow.com/questions/1891857/how-do-you-stretch-an-image-to-fill-a-div-while-keeping-the-images-aspect-rat — jolumg, Oct 17 '18 at 10:33
@jolumg Not quite; while there's a lot of overlap in some solutions, there are also many solutions that are not interchangeable, as that one is asking how to scale an image up, whereas this one is asking to scale an image down. — TylerH, Jan 02 '19 at 15:37

score 2431 · Accepted Answer · edited Jul 28 '22 at 14:48

2431

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="https://i.stack.imgur.com/xkF9Q.jpg">
</div>

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

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

edited Jul 28 '22 at 14:48

TylerH

20,799
66
75
101

answered Jun 12 '10 at 17:03

Kevin

25,946
2
19
21

66

This will not scale both the height and width. – Neil Jun 07 '11 at 03:40
90

height: auto; if you want to specify a width only – Roi Sep 10 '12 at 23:28
2

Not applying explicit width and height to the image has the side-effect that the page will not reserve space to the image, and the page will flicker or content might jump as the image loads. – Ville Miekk-oja Aug 18 '21 at 17:02

score 706 · Answer 2 · edited Jul 13 '22 at 14:40

706

It turns out there's another way to do this: object-fit.

<img style='height: 100%; width: 100%; object-fit: contain'/>

will do the work. Don't forget to include other necessary attributes like src and alt, of course.

Fiddle: http://jsfiddle.net/mbHB4/7364/

edited Jul 13 '22 at 14:40

TylerH

20,799
66
75
101

answered Jun 12 '15 at 02:48

Shih-Min Lee

9,350
7
37
67

71

This will scale the image to fit the larger dimension completely within the container, so the smaller dimension may not cover it completely. To crop the larger dimension instead, use `object-fit: cover` – Gabriel Grant Oct 20 '15 at 17:08
object-fit: cover worked for me, but now sure why ?? – vikramvi Jul 27 '22 at 05:40

Neil · Answer 3 · 2011-12-05T05:32:02.797

Currently there is no way to do this correctly in a deterministic way, with fixed-size images such as JPEGs or PNG files.

To resize an image proportionally, you have to set either the height or width to "100%", but not both. If you set both to "100%", your image will be stretched.

Choosing whether to do height or width depends on your image and container dimensions:

If your image and container are both "portrait shaped" or both "landscape shaped" (taller than they are wide, or wider than they are tall, respectively), then it doesn't matter which of height or width are "%100".
If your image is portrait, and your container is landscape, you must set height="100%" on the image.
If your image is landscape, and your container is portrait, you must set width="100%" on the image.

If your image is an SVG, which is a variable-sized vector image format, you can have the expansion to fit the container happen automatically.

You just have to ensure that the SVG file has none of these properties set in the <svg> tag:

height
width
viewbox

Most vector drawing programs out there will set these properties when exporting an SVG file, so you will have to manually edit your file every time you export, or write a script to do it.

score 97 · Answer 4 · edited Jan 01 '22 at 23:59

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 content:

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

The CSS content:

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

The jQuery part:

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

score 68 · Answer 5 · edited May 03 '21 at 13:39

You have two ways of making the image responsive.

When an image is a background image.

#container{
    width: 300px;
    height: 300px;
    background-image: url(https://images.fonearena.com/blog/wp-content/uploads/2013/11/Lenovo-p780-camera-sample-10.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}

<div id="container"><div>

Run it here

But one should use img tag to put images as it is better than background-image in terms of SEO as you can write keyword in the alt of the img tag. So here is you can make the image responsive.

When image is in img tag.

#container{
    max-width: 400px;
    overflow: hidden;
}
img{
    width: 100%;
    object-fit: contain;
}

<div id="container">
    <img src="https://images.fonearena.com/blog/wp-content/uploads/2013/11/Lenovo-p780-camera-sample-10.jpg" alt="your_keyword"/>
<div>

Run it here

For case 1. when an image is a background image for me background-size: contain; did the trick. — Rose, Feb 19 '23 at 02:40

score 60 · Answer 6 · edited Mar 27 '19 at 18:19

60

Make it simple!

Give the container a fixed height and then for the img tag inside it, set width and max-height.

<div style="height: 250px">
     <img src="..." alt=" " style="width: 100%;max-height: 100%" />
</div>

The difference is that you set the width to be 100%, not the max-width.

edited Mar 27 '19 at 18:19

Peter Mortensen

30,738
21
105
131

answered Sep 25 '13 at 08:45

Mehdi Maghrouni

1,529
22
23

score 32 · Answer 7 · edited Mar 27 '19 at 10:40

32

You can set the image as the background to a div, and then use the CSS background-size property:

background-size: cover;

It will "Scale the background image to be as large as possible so that the background area is completely covered by the background image. Some parts of the background image may not be in view within the background positioning area" -- W3Schools

edited Mar 27 '19 at 10:40

Peter Mortensen

30,738
21
105
131

answered Dec 16 '12 at 12:37

Chuck Dries

1,630
13
19

score 25 · Answer 8 · edited Mar 27 '19 at 10:44

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

It's written in pure CSS, without any JavaScript 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>

the 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;
}

score 24 · Answer 9 · answered May 06 '21 at 09:53

There are several ways to fit the image to <div>.

img {
    object-fit: cover;
}

The CSS object-fit property is used to specify how an <img> or <video> should be resized to fit its container.

This property tells the content to fill the container in a variety of ways; such as "preserve that aspect ratio" or "stretch up and take up as much space as possible".

fill - This is default. The image is resized to fill the given dimension. If necessary, the image will be stretched or squished to fit
contain - The image keeps its aspect ratio, but is resized to fit within the given dimension
cover - The image keeps its aspect ratio and fills the given dimension. The image will be clipped to fit
none - The image is not resized
scale-down - the image is scaled down to the smallest version of none or contain

You can find out more working samples here.

actimel · Answer 10 · 2022-01-26T17:44:18.447

I have much better solution without need of any JavaScript. It is fully responsive, and I use it a lot. You often need to fit an image of any aspect ratio to a container element with a 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="https://via.placeholder.com/400x300" class="fit-img" alt="sample">
  </div>

  <div class="aspect-ratio aspect-ratio-4-3 img-frame">
    <img src="https://via.placeholder.com/400x300" class="fit-img fit-img-tight" alt="sample">
  </div>

  <div class="aspect-ratio aspect-ratio-16-9 img-frame">
    <img src="https://via.placeholder.com/400x400" class="fit-img" alt="sample">
  </div>

  
  <div class="aspect-ratio aspect-ratio-16-9 img-frame">
    <img src="https://via.placeholder.com/300x400" class="fit-img fit-img-bottom" alt="sample">
  </div>
  
</div>

You can set max-width and max height independently; the 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 (for example, for a product picture on an infinite white background you can position it to center bottom easily).

score 12 · Answer 11 · edited Mar 27 '19 at 23:29

12

This solution doesn't stretch the image and fills the whole container, but it cuts some of the image.

HTML:

 <div><img src="/images/image.png"></div>

CSS:

div {
    width: 100%;
    height: 10em;
    overflow: hidden;

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

edited Mar 27 '19 at 23:29

Peter Mortensen

30,738
21
105
131

answered Aug 07 '14 at 11:54

Miia Klingstedt

131
1
5

score 11 · Answer 12 · edited Mar 27 '19 at 10:52

11

I just published a jQuery plugin that does exactly what you need with a lot of options:

https://github.com/GestiXi/image-scale

Usage:

HTML

<div class="image-container">
    <img class="scale" data-scale="best-fit-down" data-align="center" src="img/example.jpg">
</div>

JavaScript

$(function() {
    $("img.scale").imageScale();
});

edited Mar 27 '19 at 10:52

Peter Mortensen

30,738
21
105
131

answered Aug 06 '13 at 15:31

Nicolas BADIA

5,612
7
43
46

score 11 · Answer 13 · edited Mar 07 '21 at 16:32

I see that many people have suggested object-fit which is a good option. But if you want it to work in older browsers as well, there is another way of doing it easily.

It's quite simple. The approach I took was to position the image inside the container with absolute and then place it right at the centre using the combination:

position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);

Once it is in the centre, I give to the image,

// For vertical blocks (i.e., where height is greater than width)
height: 100%;
width: auto;

// For horizontal blocks (i.e., where width is greater than height)
height: auto;
width: 100%;

This makes the image get the effect of object-fit:cover.

Here is a demonstration of the above logic.

https://jsfiddle.net/furqan_694/s3xLe1gp/

This logic works in all browsers.

score 10 · Answer 14 · answered Apr 03 '18 at 13:13

10

The following works perfectly for me:

img{
   height: 99999px;
   object-fit:contain;
   max-height: 100%;
   max-width: 100%;    
   display: block;
   margin: auto auto;
}

answered Apr 03 '18 at 13:13

Chong Lip Phang

8,755
5
65
100

It also works perfectly for me as well. Not sure how the commands work together in this case @Chong Lip Phang, especially how `height: 99999px` is used? I removed it to see the effect and the horizontal centering failed, so it appears that there is no redundancy. – Vass Dec 15 '21 at 05:59
1

@Vass height:99999px basically tries to enlarge the image while preserving the aspect ratio (width: auto) until the vertical or horizontal bound is reached (max-height or max-width). I think you can also use height:200%; or width:999vw. – Chong Lip Phang Dec 15 '21 at 10:31
While using grid (grid template areas), I found that including `overflow-y: hidden;` in the upper level div of the grid area to be necessary in a situation I am facing – Vass Jan 07 '22 at 14:32

score 10 · Answer 15 · edited Mar 07 '21 at 16:35

10

A simple solution is to use Flexbox. 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.

edited Mar 07 '21 at 16:35

Peter Mortensen

30,738
21
105
131

answered May 18 '18 at 13:19

Mateo Marin

265
3
8

It works perfectly in my case, `overflow: hidden` actually forced it to resize and shrink in height, but why? I was expecting it to just hide the part of image that was outside the boundary, but it actually forced the image to shrink to the actual proportions. – Silencer Dec 05 '22 at 21:17

score 9 · Answer 16 · edited Mar 28 '19 at 14:55

9

I fixed this problem using the following code:

<div class="container"><img src="image_url" /></div>

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

.container img {
    object-fit: cover;
    object-position: top;
    display: block;
    height: 100%;
    width: 100%;
}

edited Mar 28 '19 at 14:55

TylerH

20,799
66
75
101

answered Feb 26 '19 at 20:54

Serkan KONAKCI

1,100
11
16

score 7 · Answer 17 · edited Mar 27 '19 at 23:28

<style type="text/css">
    #container{
        text-align: center;
        width: 100%;
        height: 200px; /* Set height */
        margin: 0px;
        padding: 0px;
        background-image: url('../assets/images/img.jpg');
        background-size: content; /* Scaling down large image to a div */
        background-repeat: no-repeat;
        background-position: center;
    }
</style>

<div id="container>
    <!-- Inside container -->
</div>

score 6 · Answer 18 · edited Mar 27 '19 at 10:36

I centered and scaled proportionally an image inside a hyperlink both horizontally and vertically this way:

#link {
    border: 1px solid blue;
    display: table-cell;
    height: 100px;
    vertical-align: middle;
    width: 100px;
}
#link img {
    border: 1px solid red;
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-height: 60px;
    max-width: 60px;
}

It was tested in Internet Explorer, Firefox, and Safari.

More information about centering is here.

score 6 · Answer 19 · edited Mar 27 '19 at 10:41

Give the height and width you need for your image to the div that contains the <img> tag. Don't forget to give the height/width in the proper style tag.

In the <img> tag, give the max-height and max-width as 100%.

<div style="height:750px; width:700px;">
    <img alt="That Image" style="max-height:100%; max-width:100%;" src="">
</div>

You can add the details in the appropriate classes after you get it right.

score 6 · Answer 20 · edited Mar 27 '19 at 10:44

The code below is adapted from previous answers and is tested by me using an image called storm.jpg.

This is the complete HTML code for a simple page that displays the image. This works perfect and was tested by me with www.resizemybrowser.com. Put the CSS code at the top of your HTML code, underneath your head section. Put the picture code wherever you want the picture.

<html>
    <head>
        <style type="text/css">
            #myDiv
            {
                  height: auto;
                  width: auto;
            }
            #myDiv img
            {
                max-width: 100%;
                max-height: 100%;
                margin: auto;
                display: block;
            }
        </style>
    </head>

    <body>
        <div id="myDiv">
            <img src="images/storm.jpg">
        </div>
    </body>
</html>

score 6 · Answer 21 · edited Mar 27 '19 at 23:36

6

You have to tell the browser the height of where you are placing it:

.example {
    height: 220px; /* DEFINE HEIGHT */
    background: url('../img/example.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
}

edited Mar 27 '19 at 23:36

Peter Mortensen

30,738
21
105
131

answered Feb 23 '15 at 03:53

Rick

12,606
2
43
41

score 6 · Answer 22 · edited Mar 27 '19 at 23:39

Edit: Previous table-based image positioning had issues in Internet Explorer 11 (max-height doesn't work in display:table elements). I've replaced it with inline based positioning which not only works fine in both Internet Explorer 7 and Internet Explorer 11, but it also requires less code.

Here is my take on the subject. It'll only work if the container has a specified size (max-width and max-height don't seem to get along with containers that don't have concrete size), but I wrote the CSS content in a way that allows it to be reused (add picture-frame class and px125 size class to your existing container).

In CSS:

.picture-frame
{
    vertical-align: top;
    display: inline-block;
    text-align: center;
}

.picture-frame.px125
{
    width: 125px;
    height: 125px;
    line-height: 125px;
}

.picture-frame img
{
    margin-top: -4px; /* Inline images have a slight offset for some reason when positioned using vertical-align */
    max-width: 100%;
    max-height: 100%;
    display: inline-block;
    vertical-align: middle;
    border: 0; /* Remove border on images enclosed in anchors in Internet Explorer */
}

And in HTML:

<a href="#" class="picture-frame px125">
    <img src="http://i.imgur.com/lesa2wS.png"/>
</a>

DEMO

/* Main style */

.picture-frame
{
    vertical-align: top;
    display: inline-block;
    text-align: center;
}

.picture-frame.px32
{
    width: 32px;
    height: 32px;
    line-height: 32px;
}

.picture-frame.px125
{
    width: 125px;
    height: 125px;
    line-height: 125px;
}

.picture-frame img
{
    margin-top: -4px; /* Inline images have a slight offset for some reason when positioned using vertical-align */
    max-width: 100%;
    max-height: 100%;
    display: inline-block;
    vertical-align: middle;
    border: 0; /* Remove border on images enclosed in anchors in Internet Explorer */
}

/* Extras */

.picture-frame
{
    padding: 5px;
}

.frame
{
    border:1px solid black;
}

<p>32px</p>
<a href="#" class="picture-frame px32 frame">
    <img src="http://i.imgur.com/lesa2wS.png"/>
</a>
<a href="#" class="picture-frame px32 frame">
    <img src="http://i.imgur.com/kFMJxdZ.png"/>
</a>
<a href="#" class="picture-frame px32 frame">
    <img src="http://i.imgur.com/BDabZj0.png"/>
</a>
<p>125px</p>
<a href="#" class="picture-frame px125 frame">
    <img src="http://i.imgur.com/lesa2wS.png"/>
</a>
<a href="#" class="picture-frame px125 frame">
    <img src="http://i.imgur.com/kFMJxdZ.png"/>
</a>
<a href="#" class="picture-frame px125 frame">
    <img src="http://i.imgur.com/BDabZj0.png"/>
</a>

Edit: Possible further improvement using JavaScript (upscaling images):

function fixImage(img)
{
    var $this = $(img);
    var parent = $this.closest('.picture-frame');
    if ($this.width() == parent.width() || $this.height() == parent.height())
        return;

    if ($this.width() > $this.height())
        $this.css('width', parent.width() + 'px');
    else
        $this.css('height', parent.height() + 'px');
}

$('.picture-frame img:visible').each(function
{
    if (this.complete)
        fixImage(this);
    else
        this.onload = function(){ fixImage(this) };
});

There is a drawback to using this method. If the image fails to load, alt text will be displayed with parent container `line-height`. If alt text has more than one line, it will start looking really bad... — jahu, Jan 19 '16 at 12:49

score 6 · Answer 23 · edited May 23 '17 at 11:47

6

As answered here, you can also use vh units instead of max-height: 100% if it doesn't work on your browser (like Chrome):

img {
    max-height: 75vh;
}

edited May 23 '17 at 11:47

Community

1
1

answered May 30 '16 at 02:54

gaborous

15,832
10
83
102

score 4 · Answer 24 · edited Mar 27 '19 at 23:25

The accepted answer from Thorn007 doesn't work when the image is too small.

To solve this, I added a scale factor. This way, it makes the image bigger and it fills the div container.

Example:

<div style="width:400px; height:200px;">
  <img src="pix.jpg" style="max-width:100px; height:50px; transform:scale(4); transform-origin:left top;" />
</div>

Notes:

For WebKit you must add -webkit-transform:scale(4); -webkit-transform-origin:left top; in the style.
With a scale factor of 4, you have max-width = 400/4 = 100 and max-height = 200/4 = 50
An alternate solution is to set max-width and max-height at 25%. It's even simpler.

score 4 · Answer 25 · edited Mar 27 '19 at 23:33

A simple solution (4-step fix!!) that seems to work for me, is below. The example uses the width to determine the overall size, but you can also flip it to use the height instead.

Apply CSS styling to the image container (for example, <img>)
Set the width property to the dimension you want
- For dimensions, use % for relative size, or autoscaling (based on image container or display)
- Use px (or other) for a static, or set dimension
Set the height property to automatically adjust, based on the width
ENJOY!

For example,

<img style="width:100%; height:auto;"
    src="https://googledrive.com/host/0BwDx0R31u6sYY1hPWnZrencxb1k/thanksgiving.png"
/>

score 3 · Answer 26 · edited Mar 28 '19 at 00:01

All the provided answers, including the accepted one, work only under the assumption that the div wrapper is of a fixed size. So this is how to do it whatever the size of the div wrapper is and this is very useful if you develop a responsive page:

Write these declarations inside your DIV selector:

width: 8.33% /* Or whatever percentage you want your div to take */
max-height: anyValueYouWant /* (In px or %) */

Then put these declarations inside your IMG selector:

width: "100%" /* Obligatory */
max-height: anyValueYouWant /* (In px or %) */

VERY IMPORTANT:

The value of maxHeight must be the same for both the DIV and IMG selectors.

score 2 · Answer 27 · edited Mar 28 '19 at 00:00

2

The 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 you're using Bootstrap, just add the img-responsive class and change to

.container img{
    object-fit: cover;
}

edited Mar 28 '19 at 00:00

Peter Mortensen

30,738
21
105
131

answered Jun 04 '16 at 11:49

Joseph Lariosa

365
1
4
14

score 2 · Answer 28 · edited Mar 28 '19 at 00:15

2

If you're using Bootstrap, you just need to add the img-responsive class to the img tag:

<img class="img-responsive" src="img_chania.jpg" alt="Chania">

Bootstrap Images

edited Mar 28 '19 at 00:15

Peter Mortensen

30,738
21
105
131

answered Jan 02 '19 at 13:53

HoangYell

4,100
37
31

score 2 · Answer 29 · answered Apr 09 '21 at 21:43

As seen in my 2014 Codepen example, I've made a solution that would work for any unknown combination of width/height (aspect-ratio) with the help of a as little javascript as possible, to change the CSS of how the image is centered when the aspect-ratio of the container changes above/below the aspect ratio of the image:

Try resizing the container by dragging the bottom right corner:

// Detects when the window width is too narrow for the current image 
// aspect-ratio, and fits it to height 100% instead of width 100%.
const photo = document.images[0]

const onPhotoResize = new ResizeObserver(entries => 
  window.requestAnimationFrame(checkRatio)
)

onPhotoResize.observe(photo.parentNode)

function checkRatio(){
  const photoParent = photo.parentNode,
        imageAspectRatio = photo.clientWidth / photo.clientHeight,
        parentAspectRatio = photoParent.clientWidth / photoParent.clientHeight
        
  photo.classList[imageAspectRatio > parentAspectRatio ? 'add':'remove']('max')
}

.box{
  width: 20%;
  height: 60%;
  margin: auto;
  position: absolute;
  top:0; left:0; right:0; bottom:0;
  resize: both;
  overflow: hidden;
  border: 5px solid red;
 } 

.box > img{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    transform: translate(-50%, -50%); 
}

.box > img.max{ width:auto; height:100%; }

<div class='box'>
  <img src="https://upload.wikimedia.org/wikipedia/commons/6/6a/Mona_Lisa.jpg">
</div>

score 1 · Answer 30 · edited Mar 27 '19 at 23:13

The solution is easy with a bit of maths...

Just put the image in a div and then in the HTML file where you specify the image. Set the width and height values in percentages using the pixel values of the image to calculate the exact ratio of width to height.

For example, say you have an image that has a width of 200 pixels and a height of 160 pixels. You can safely say that the width value will be 100%, because it is the larger value. To then calculate the height value you simply divide the height by the width which gives the percentage value of 80%. In the code it will look something like this...

<div class="image_holder_div">
    <img src="some_pic.png" width="100%" height="80%">
</div>

Servus · Answer 31 · 2021-05-01T15:56:43.000

This was my solution. You will need to have the picture inserted twice. But it does not use js, and the img will resize to both width and height. You can click on 'run code snippet - full page', open dev console and resize window-width to see the responsive effect.

    /* responsive width */
      .responsivewidth{
        background: lightsalmon;
        height: 100px;
        width: 50%;
      }
      /* Widthlimit */
      .maxedbywidth {
        background: navy;
        height: 200px;
        width: 100px;
      }
      .div1 {
        max-height: 100%;
        position: relative;
        box-sizing: content-box;

        /* Center: */
        top: 50%;
        transform: translateY(-50%);
      }
      .margerimg {
        height: auto;
        max-width: 100%;
        opacity: 0;
      }
      .div2 {
        height: 100%;
        width: fit-content;
        position: absolute;
        top: 0;

        /* Center: */
        left: 50%;
        transform: translateX(-50%);
      }
      .mainimg {
        max-height: 100%;
        max-width: 100%;
      }

<div class="responsivewidth">
      <div class="div1">
        <img class="margerimg" src="https://via.placeholder.com/2000x1500" />
        <div class="div2">
          <img class="mainimg" src="https://via.placeholder.com/2000x1500" />
        </div>
      </div>
    </div>
    <div class="maxedbywidth">
      <div class="div1">
        <img class="margerimg" src="https://via.placeholder.com/2000x1500" />
        <div class="div2">
          <img class="mainimg" src="https://via.placeholder.com/2000x1500" />
        </div>
      </div>
    </div>

Having to insert the image twice (or four times in your actual demo) seems less than ideal compared to some of the other solutions here which just require a CSS property or three. — TylerH, May 03 '21 at 13:41
I just felt like sharing my solution, maybe helping someone in the process. I actually think its a very nice bit of code you can apply as technique if you understand it. But I don't feel its right to criticise it, if you don't at least take the time to understand it. It's actually 2 pics u need — Servus, May 03 '21 at 15:03

score 0 · Answer 32 · edited Mar 27 '19 at 23:45

0

Check my answer, Make an image responsive - simplest way -

img{
    width: 100%;
    max-width: 800px;
}

edited Mar 27 '19 at 23:45

Peter Mortensen

30,738
21
105
131

answered Apr 19 '16 at 08:04

Abhishek Goel

18,785
11
87
65

Balaji · Answer 33 · 2021-03-16T09:33:50.507

This article may help you:

  .square {
     position: relative;
     width: 300px;
     height: 300px;
     overflow: hidden;
  }
  img {
     position: absolute;
     max-width: 100%;
     width: 100%;
     height: auto;
     top: 50%;
     left: 50%;
     transform: translate( -50%, -50%);
 }
  img.landscape {
    height: 100%;
    width: auto;
}

<div class="square">
   <img src="https://unsplash.it/400/500" alt="Image" />
</div>
<div class="square">
   <img src="https://unsplash.it/500/400" class="landscape" alt="Image" />
</div>

Simple CSS Solutions: How to fit images with different dimensions in set containers (2017-05-01)

  .square {
     position: relative;
     width: 441px;
     height: 200px;
     overflow: hidden;
     border:1px solid black;
  }
  img {
     max-width: 100%;
/*     width: 100%;*/<----it stretch image and fit into the parent
     height: auto;
/*     transform: translate( -50%, -50%);*/<-----set vertically and horizontally center
 }
  img.landscape {
    height: 100%;
    width: auto;
}

<div class="square">
   <img src="https://cdn.pixabay.com/photo/2020/08/28/12/32/man-5524488__340.jpg" alt="Image" />
</div>

Perhaps remove the outcommented CSS? – Peter Mortensen Mar 07 '21 at 16:29 — Peter Mortensen, Mar 07 '21 at 16:29
An explanation would be in order. – Peter Mortensen Mar 07 '21 at 16:30 — Peter Mortensen, Mar 07 '21 at 16:30

How to auto-resize an image while maintaining aspect ratio

33 Answers33

Here is a demonstration of the above logic.

DEMO

Try resizing the container by dragging the bottom right corner:

Linked

Related