PrivateBin is a minimalist, open-source online pastebin descended from Sebastien Sauvage's original ZeroBin project, redesigned so that all encryption and decryption happens client-side in the browser using 256-bit AES in Galois/Counter mode. Because the server only ever stores ciphertext, an operator has no way to read a paste's contents, which gives plausible deniability to administrators and protects users if the server itself is ever compromised or subpoenaed. Optional features include password-protected pastes, burn-after-reading expiry, discussion threads attached to a paste, and a choice of Bootstrap-based or classic themes. Its lightweight PHP and vanilla JavaScript codebase, released mainly under the zlib/libpng license with a few bundled libraries under MIT, BSD, and Apache terms, makes it easy to self-host on nearly any shared hosting environment.