CSS Image Max-width Set To Original Image Size? - Stack Overflow

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Learn more about Labs CSS image max-width set to original image size? Ask Question Asked 10 years, 6 months ago Modified 4 years, 11 months ago Viewed 143k times 91

Can you do this? I'm having users upload images into a container that is width:100%, but I don't want the images to be larger than their original size. Many thanks!

• css
• image

Share Improve this question Follow asked Jun 13, 2014 at 4:27 nikk wongnikk wong 8,61066 gold badges5555 silver badges7171 bronze badges 2

• 3 The image should naturally be the size that it is. Are you setting the image to width:100 also? – Theodore Enderby Commented Jun 13, 2014 at 4:30
• 3 No. You cannot. There is no way for CSS to know the actual size of a random image. You'd need javascript to detect the image size and scale the image. – Koala Yeung Commented Jun 13, 2014 at 4:32

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2 Answers 2

Sorted by: Reset to default Highest score (default) Trending (recent votes count more) Date modified (newest first) Date created (oldest first) 143

Just don't set the width of the image, only the max-width.

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

(height:auto is not really necessary, since auto is the default, but I put it in there as a reminder to myself that I want the image to have its natural proportions.)

This snippet has two boxes, one that is smaller than the image and one that is larger. As you can see, the image in the smaller box gets scaled down, while the one in the bigger box has its normal size.

div {border:2px outset green; margin:6px 0} .box1 {width:100px; height:70px;} .box2 {width:200px; height:100px;} img {max-width:100%; height:auto} <div class="box1"> <img src="https://i.sstatic.net/FuQYf.png" alt="" /> </div> <div class="box2"> <img src="https://i.sstatic.net/FuQYf.png" alt="" /> </div>

Share Improve this answer Follow edited Jan 26, 2020 at 8:12 answered Jun 13, 2014 at 6:22 Mr ListerMr Lister 46.5k1515 gold badges113113 silver badges155155 bronze badges 13

• 10 If someone is wondering (like me) how to override an inherited width setting, just add width:auto in the new class that you will assign to the image. – grasskode Commented Mar 29, 2016 at 15:10
• 8 This sets the max width to the size of the container, rather than to the original (or natural) size of the image. – Tom Commented Mar 26, 2020 at 22:32
• 3 That’s not how I read the OPs requirements. He’s asking for it to not exceed the original / natural dimensions, rather than to not exceed the container. – Tom Commented Mar 28, 2020 at 11:00
• 2 @MrLister developer.mozilla.org/en-US/docs/Web/CSS/max-width max-width as a percentage defines the max-width as a percentage of the containing block's width – Tom Commented Apr 1, 2020 at 18:00
• 1 What is working here is the absence of setting a width, which typically means an image sizes itself according to native size. What max-width does is set a limit how big the display size can be. At least this is what happens in modern browsers in 2020, but I think this was commonly the case in 2014 as well. I think Mr Lister said as much already, just clarifying, – MiB Commented Dec 1, 2020 at 19:20

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You can set the max width of the image in a style tag on the image itself. Then in the style sheet set the display type to "block", the width to whatever percentage of the container you want, and the height to auto. Then add margin: 0px auto to that and it should center perfectly and will never be larger that it's original size.

If these are user-uploaded images and you are using PHP for example, find the image width by using getImageSize() and add the style tag programmatically to the image.

Share Improve this answer Follow answered Apr 13, 2015 at 18:51 Nancy Hastings-TrewNancy Hastings-Trew 15711 bronze badge Add a comment |

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