Browser Instant Messaging Platform with Accessible, Encrypted Messaging.
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Browser Instant Messaging Platform with Accessible, Encrypted Messaging

Experimental software: Don't trust with your life! Peer review appreciated.


Cryptocat is a browser-based XMPP client that provides multi-user (and private) instant messaging inside chatrooms. It uses the OTR protocol for encrypted two-party chat and the (upcoming) mpOTR protocol for encrypted multi-party chat.

Target Platforms

Google Chrome: src/chrome/

Run make chrome to build a Google Chrome-loadable .zip extension (or just .zip the directory.)

Mozilla Firefox: src/firefox/

Run make firefox to build a Mozilla Firefox-loadable .xpi extension (or just .zip the directory and change the extension to .xpi.)

Apple Safari: src/cryptocat.safariplugin/

Apple's model makes an automated build process difficult.

Compatibility Status

 |             Windows   Mac      Linux    |
 | Chrome  |   Yes       Yes      Yes      |
 |---------                                |
 | Firefox |   Yes       Yes      Yes      |
 |---------                                |
 | Safari  |   Yes       Yes               |
 |---------                                |

Documentation & Wiki



We have a million issues worth discussing here!


Cryptocat is released under the GNU Affero General Public License (AGPL3):

Copyright (C) 2011, 2012 Nadim Kobeissi

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero 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 Affero General Public License for more details.

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

The full license text is included in LICENSE.txt.


  • Builds are available in release/.


  • Lead Developer: Nadim Kobeissi
  • Development Contributors: Jacob Appelbaum, Joseph Bonneau, Arlo Breault, Arturo Filasto, Fabio Pietrosanti
  • Multimedia Contributors: A.J. Korkidakis, P.J. Onori, Rich Vreeland

With a warm thanks to the hard-working contributors who wish to remain anonymous.