For some things base64 is great. When you have a e.g monero address and you want to show the user a QR image code it doesn't make sense to build images from that and store them on the server (for abuse and storage reasons). But with base64 you can generate those on the fly and render them when the user visits a given page.

Because it helps us to put images content to page text. Yeah if use images urls they're gonna be cached, but in other hand it's gonna be a lot of requests. So have to increase limits of request for DDOS defender pretty high.

Using base64 images lets to do only 1 request for every page, can set up DDOS defense more accurate.

inlining base64 is not about anonymity, it's about performance. because tor is high latency - including everything needed to render the page in a single response without requiring follow-up requests reduces the time to load significantly as round-trips take much longer than on the surface web. you do lose out on the caching functionality of the browser but that trade off is normally worth it on tor.

Question: does Base64 really contribute to user anonymity?

—bitchlasagna

Short Answer: No! I does not increase user anonymity.

It limits connections to the webserver. In clearnet you want to use direct links, because from different domains the browser would open a lot of connections. But in the darknet you get everything most of the time of a webserver directly. So, use base64 to have one connection per user.