How to maintain aspect ratio using HTML IMG tag

Don't set height AND width. Use one or the other and the correct aspect ratio will be maintained.

.widthSet {
    max-width: 64px;
}

.heightSet {
    max-height: 64px;
}

<img src="http://placehold.it/200x250" />

<img src="http://placehold.it/200x250" width="64" />

<img src="http://placehold.it/200x250" height="64" />

<img src="http://placehold.it/200x250" class="widthSet" />

<img src="http://placehold.it/200x250" class="heightSet" />

here is the sample one

div{
   width: 200px;
   height:200px;
   border:solid
 }

img{
    width: 100%;
    height: 100%;
    object-fit: contain;
    }

<div>
  <img src="https://upload.wikimedia.org/wikipedia/meta/0/08/Wikipedia-logo-v2_1x.png">
</div>

Set width and height of the images to auto, but limit both max-width and max-height:

img {
    max-width:64px;
    max-height:64px;
    width:auto;
    height:auto;
}

Fiddle

If you want to display images of arbitrary size in the 64x64px "frames", you can use inline-block wrappers and positioning for them, like in this fiddle.

How to maintain aspect ratio using HTML IMG tag

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