[Retr0id]

Web browsers do not support pbm, last time I checked. On the other hand, the JPEG-XL rollout is well underway (e.g. Chrome supports it behind a feature flag).

The image is only 22 bytes as a jxl:

https://cdn.discordapp.com/attachments/286612533757083648/96...

base64 data uri version:

  data:image/jxl;base64,/wp/QCQIBgEALABLOEmIDIPCakgSBg==

[eru]

Most browser do support gzip though. Sort-of transparently on the connection level.

So instead of optimizing the size of your file directly, you could optimize the size of what's actually send over the connection.

I wonder if that would give you a slightly different png or bmp or so?