CSS scale down image to fit in containing div, without specifing original size

I want to have a website where I can upload images of different sizes to be displayed in a jquery slider. I can't seem to fit (scaling down) the image in a containing div. Here's how I'm intending to do it

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org    /TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title> 
<link rel="stylesheet" type="text/css" href="Imtest.css"/>
</head>

<body>

<div id="wrapper"> 

<div id="im"><img src="Images/Scarpa2_1.jpg" /></div>

</div>  
</body>
</html>

And the CSS

#wrapper {
    width: 400px;
    height: 400px;
    border: 2px black solid;
    margin: auto;
}

#im {
    max-width: 100%;
}

I've tried to set the max-width of my image to 100% in CSS. But that doens't work.

Solution 1:

You can use a background image to accomplish this;

From MDN - Background Size: Contain:

This keyword specifies that the background image should be scaled to be as large as possible while ensuring both its dimensions are less than or equal to the corresponding dimensions of the background positioning area.

Demo

CSS:

#im {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("path/to/img");
    background-repeat: no-repeat;
    background-size: contain;
}

HTML:

<div id="wrapper">
    <div id="im">
    </div>
</div>

Solution 2:

This is an old question I know, but this is in the top five for several related Google searches. Here's the CSS-only solution without changing the images to background images:

width: auto;
height: auto;
max-width: MaxSize;
max-height: MaxSize;

"MaxSize" is a placeholder for whatever max-width and max-height you want to use, in pixels or percentage. auto will increase (or decrease) the width and height to occupy the space you specify with MaxSize. It will override any defaults for images you or the viewer's browser might have for images. I've found it's especially important on Android's Firefox. Pixels or percentages work for max size. With both the height and width set to auto, the aspect ratio of the original image will be retained.

If you want to fill the space entirely and don't mind the image being larger than its original size, change the two max-widths to min-width: 100% - this will make them completely occupy their space and maintain aspect ratio. You can see an example of this with a Twitter profile's background image.

Solution 3:

if you want both width and the height you can try

 background-size: cover !important;

but this wont distort the image but fill the div.

CSS scale down image to fit in containing div, without specifing original size

Solution 1:

Solution 2:

Solution 3:

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