Data URLs should be ~1.37x the size [0] of the original file (and generally, kept in the same format). Obviously, there are issues of caching, keeping the image loaded in memory, etc, but it shouldn&#x27;t be all that bad. Esp. when you consider that ads are inefficient for a variety of other reasons.<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Base64#MIME" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Base64#MIME</a>