Auto Resize Image in CSS Flexbox Layout and Keeping Aspect Ratio

Auto Resize Image in CSS FlexBox Layout and keeping Aspect Ratio?

img {max-width:100%;} is one way of doing this. Just add it to your CSS code.

http://jsfiddle.net/89dtxt6s/

Maintain image aspect ratio when changing height

For img tags if you define one side then other side is resized to keep aspect ratio and by default images expand to their original size.

Using this fact if you wrap each img tag into div tag and set its width to 100% of parent div then height will be according to aspect ratio as you wanted.

http://jsfiddle.net/0o5tpbxg/

* {
    margin: 0;
    padding: 0;
}
.slider {
    display: flex;
}
.slider .slide img {
    width: 100%;
}

Flexbox Grid with Images - Maintain Aspect Ratio / Proportions

An initial setting of a flex container is align-items: stretch. This means that flex items will expand, by default, to cover the full length of the cross axis of the container.

Consider overriding the default with align-items: flex-start.

 container .item {
   display: flex;
   align-items: flex-start; /* new */
 }

revised codepen

CSS - Keep image aspect ration flexbox

Unless you have very specific requirements, I suggest Masonry:

a JavaScript grid layout library. It works by placing elements in
optimal position based on available vertical space, sort of like a
mason fitting stones in a wall. You’ve probably seen it in use all
over the Internet.

in combination with imagesLoaded For a versatile lightweight solution.

There are many ways to implement Masonry.

The following is my personal favorite.

All my comments are inside the snippet below

body {  background: #131418;}

/* Step 1: start with resetting some defaults */
* {  margin: 0 auto;  padding: 0;  max-width: 100%;}

/* Step 2: center things inside the grid and clear some space around it by setting a device based max-width and margin*/
.grid {  text-align: center;  max-width: 95vw;  margin: 2.5vw auto;}

/* Step 3: how big should the gap be between grid items? remember that the total gap between two items would be double what you set here since both would have that amount set as their individual padding. Also add box-sizing:border-box to make sure the padding doesn't affect the total widh of the item */
.grid-item {  padding: 5px;  box-sizing: border-box;}

/* Step 4: Add media queries (subjective) to make the whole grid resposive. */
@media (min-width: 500px) {  .grid-item {    width: 50%;  }}
@media (min-width: 1000px) {  .grid-item {    width: 33.333%;  }}
@media (min-width: 1700px) {  .grid-item {    width: 25%;  }}
@media (min-width: 2100px) {  .grid-item {    width: 20%;  }}

<!-- Made possible by the great work of David DeSandro @ https://masonry.desandro.com -->
<!-- Part 1: Add the scripts -->
<!-- Step 1: Let's start by loading jQuery. jQuery is not required for masonary to function but makes things easier  --><script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Step 2: Then load imagesloaded. imagesloaded makes sure the images are not displayed until they are fully loaded --><script src="https://unpkg.com/imagesloaded@4/imagesloaded.pkgd.min.js"></script>
<!-- Step 3: we load masonry --><script src="https://unpkg.com/masonry-layout@4/dist/masonry.pkgd.min.js"></script>

<!-- Part 2: Create the grid -->

<!-- Step 1: Start with a the main grid wrapper--><div class="grid">
  <!-- Step 2: Add grid items--->
  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/736x/00/37/03/0037037f1590875493f413c1fdbd52b1--cool-beards-inspiring-photography.jpg" />  </div>
  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/736x/cd/90/d9/cd90d9de63fa2c8e5c5e7117e27b5c18--gritty-portrait-photography-studio-photography.jpg">  </div>
  <!-- Step 3: repeat...--->  <div class="grid-item">    <img src="https://1.bp.blogspot.com/-9QM7ciGXRkQ/V1hsB-wNLBI/AAAAAAAAMoA/eYbSHs00PTAjrI4QAmvYAIGCUe1AuRAnwCLcB/s1600/bryan_cranston_0095.jpg">  </div>
  <div class="grid-item">    <img src="http://webneel.com/sites/default/files/images/project/best-portrait-photography-regina-pagles%20(10).jpg" />  </div>

  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/736x/dd/45/96/dd4596b601062eb491ea9bb8e3a78062--two-faces-baby-faces.jpg" />  </div>
  <div class="grid-item">    <img src="http://www.marklobo.com.au/news/wp-content/uploads/2013/03/Melbourne_Portrait_Photographer_Mark_Lobo-Cowboy.jpg" />  </div>
  <div class="grid-item">    <img src="https://format-com-cld-res.cloudinary.com/image/private/s--PcYqe7Zw--/c_limit,g_center,h_65535,w_960/a_auto,fl_keep_iptc.progressive,q_95/145054-8576001-Rob-Green-by-Zuzana-Breznanikova_7725_b_w.jpg" />  </div>
  <div class="grid-item">    <img src="http://www.iefimerida.gr/sites/default/files/janbanning11.jpg" />  </div>
  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/736x/66/bb/e7/66bbe7acc0d64da627afef440a29714b--portrait-photos-female-portrait.jpg" />  </div>
  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/736x/25/34/b6/2534b6c18c659546463f13b2dc62d4ce--natural-portraits-female-portraits.jpg" />  </div>
  <div class="grid-item">    <img src="https://s-media-cache-ak0.pinimg.com/originals/8d/67/12/8d671230ced871df8428b571ed6ec192.jpg" />  </div>
</div>
<!-- Part 3: the script call -->
<!-- Now that everything is loaded we create a script to trigger masonary on $grid. Note that this simply says: "if the images are fully loaded, trigger masnory on $grid. --><script>  $(".grid").imagesLoaded(function() {    $(".grid").masonry({      itemSelector: ".grid-item"    });  });</script>

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