The 20KB limit is just on your own server I hope, not an hard limit of the software, right?

Yes, it’s a non-rigid restriction. The default is 10,000 instead of 20,000. You can also disable this limit completely if you want.

The restriction on the length of the paste is due to the following:

• It will be difficult for client’s browser to render large HTML.
• Code highlighting is done by the server, not by JavaScript. Accordingly here is a trivial saving the CPU.

Convos.chat is a really cool IRC client that has a build in paste-bin.

The client is really cool. I’ve been looking for a client that can be online 24/7. Thank you.

But I still don’t regret making Lenpaste because I use it for mail and messengers (Slack, Telegram, Discord, Matrix) at the same time. I’m amazed that even Slack has trouble inserting a big chunk of code or logs.