Pontoon - Mozilla’s Localization Platform

Pontoon is a translation management system used and developed by the Mozilla localization community. It can handle any project that uses one of the supported file formats:

  • .dtd

  • .ftl (Fluent)

  • .inc

  • .ini

  • .json (WebExtensions)

  • .json (key-value)

  • .po (Gettext)

  • .properties

  • .xliff

  • .xml (Android)

Pontoon can pull strings it needs to translate from an external source, and write them back periodically. Typically these external sources are version control repositories that store the strings for an application. Supported external sources include Git, Mercurial and Subversion.

Other Documentation

Important additional Pontoon documentation can also be found at the following sites:

How to localize with Pontoon (Mozilla Localizer Documentation)

How to manage localizations on Pontoon (Mozilla Internal Tools Documentation)

(For an issue to improve the documentation, see #2214.)


If you are interested in contributing to Pontoon’s code, start with The Guide to your First Contribution to Pontoon.


If you want to deploy your own instance of Pontoon, read the Deployment section.

Once you have a running instance, you will likely want to learn about Localizing your projects, and then dive into management tasks.


If you’re looking for help on using Pontoon for localizing projects, whether on Mozilla’s instance or any other, you can read our How to use Pontoon documentation.