Zopfli Optimization: Literally Free Bandwidth

This article is a repost promoting content originally published elsewhere. See more things Dan's reposted.

In 2007 I wrote about using PNGout to produce amazingly small PNG images. I still refer to this topic frequently, as seven years later, the average PNG I encounter on the Internet is very unlikely to be optimized.

For example, consider this recent Perry Bible Fellowship cartoon

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