How come Shopify’s rendered responsive image is bigger in file size than the large image I uploaded?

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I uploaded an image to Shopify that has a dimension of 2048 x 2048 with the file size of 37kb, as from what I read, Shopify has responsive images and only loads in the correct dimensions to the user based on the screen dimensions.

However, when I go to my website and download that images onto my desktop, I see that even though it’s smaller in dimension by almost half, it is bigger in file size. Dimension is 1200 x 1200 (decreased) with file size of 50kb (increased). How come it is bigger in file size when it’s smaller in dimension?



Image shows info of the image I uploaded to Shopify vs the info of the image I downloaded from the live website


Is there a need to compress images before uploading it to the Shopify website?

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