Browser extension for OpenPGP encryption with Webmail
JavaScript HTML CSS Shell
Latest commit 205847e Feb 23, 2017 @toberndo toberndo Release 1.7.0


Build Status

Mailvelope is a browser extension for Google Chrome and Firefox that allows secure email communication based on the OpenPGP standard. It can be configured to work with arbitrary Webmail provider.

OpenPGP backends

Mailvelope uses the following OpenPGP implementation

  • OpenPGP.js for the Chrome Extension and for the Firefox Addon


Mailvelope is available in the Chrome Web Store:

Check the releases section for latest builds of Firefox and Chrome installation packages.

Client API

You can find the current API Documentation on GitHub pages. The version will correspond to the current master branch. A demo page with unit tests is available at:

Build instructions

If you don’t have grunt and bower installed, yet:

npm install -g grunt-cli bower

and then get and build the sources:

git clone git://
cd mailvelope
git submodule update --init
cd dep/chrome/openpgpjs
npm install && grunt
cd ../../firefox/openpgpjs
npm install && grunt
cd ../../..
npm install && bower install && grunt


grunt dist-cr

The extension will be in dist/


grunt dist-ff

This will get you the latest firefox addons-sdk to build the addon.

The addon will be in dist/mailvelope.firefox.xpi.


Update your local repository:

# inside mailvelope folder
cd dep/chrome/openpgpjs
git pull origin master && grunt
cd ../../firefox/openpgpjs
git pull origin master && grunt
cd ../../..
# continue with 'grunt dist-cr' or 'grunt dist-ff'

There are a few more tasks available through grunt:

  • watch source code for changes and recompile if needed:

    grunt watch

  • reset repository

    grunt clean



Use of this source code is governed by the GNU AFFERO GENERAL PUBLIC LICENSE that can be found in the LICENSE file.


Contact: Thomas Oberndörfer
Twitter: @mailvelope
Contributors: see list on GitHub