client-side AES-encrypted Markdown pastebin clone
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CryptDown is a microservice to store documents, pastes or code snippets, similar to pastebin.

It uses real 256bit AES encryption, which takes place directly in your browser. No plaintext is ever being sent. Nobody can help you when you lose an encryption password for a paste. Your IP-Address will not be saved!

The 1st CryptDown instance can be found on Feel free to improve this tool, give feedback, or create a new self-hosted instance.

CryptDown was built with the following great and free software:

  • Fat-Free Framework
  • CryptoJS
  • MediumEditor
  • Showdown.js
  • to-markdown.js
  • jQuery
  • Twitter Bootstrap
  • font-awesome


To install CryptDown on your own, ensure you have the following environment:

  • apache webserver (nginx is also possible)
  • PHP 5.3
  • PDO SQlite

adjust the config.ini file for your needs and run the /install route in your browser. done.


This tool is just for testing purpose and a personal playground. Don't blame me if you lose your data, keys, or think it lacks on security.

Please file an issue for support and improvements.


Copyright (C) 2015, Christian Knuth

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see