Paaster - End-to-end encrypted Pastebin
Paaster - End-to-end encrypted Pastebin

github.com
GitHub - WardPearce/paaster: Paaster is a secure and user-friendly pastebin application that prioritizes privacy and simplicity. With end-to-end encryption and paste history, Paaster ensures that your pasted code remains confidential and accessible.

Similar: https://github.com/PrivateBin/PrivateBin
It can be used at https://bin.disroot.org/ and also support Markdown.