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Common Voice

This is the web app for Mozilla Common Voice, a platform for collecting speech donations in order to create public domain datasets for training voice recognition-related tools.

Upcoming releases

Type Expected date More info
Platform code & sentences Dec 15, 2021 Release notes
Dataset Jan 2022 Dataset metadata

Quick links

How to contribute

🎉 First off, thanks for taking the time to contribute! This project would not be possible without people like you. 🎉

There are many ways to get involved with Common Voice - you don't have to know how to code to contribute!

  • To add or correct the translation of the web interface, please use the Mozilla localization platform Pontoon. Please note, we do not accept any direct pull requests for changing localization content.
  • For information on how to add or edit sentences to Common Voice, see
  • For instructions on setting up a local development environment, see
  • For information on how to add a new language to Common Voice, see
  • For information on how to get in contact with existing language communities, see

For more general guidance on building your own language community using Mozilla voice tools, please refer to the Mozilla Voice Community Playbook.


For general discussion (feedback, ideas, random musings), head to our Discourse Category.

For bug reports or specific feature, please use the GitHub issue tracker.

For live chat, join us on Matrix.

Licensing and content source

This repository is released under MPL (Mozilla Public License) 2.0.

The majority of our sentence text in /server/data comes directly from user submissions in our Sentence Collector or they are scraped from Wikipedia using our extractor tool, and are released under a CC0 public domain Creative Commons license.

Any files that follow the pattern europarl-VERSION-LANG.txt (such as europarl-v7-de.txt) were extracted with our thanks from the Europarl Corpus, which features transcripts from proceedings in the European parliament.


If you use the data in a published academic work we would appreciate if you cite the following article:

  • Ardila, R., Branson, M., Davis, K., Henretty, M., Kohler, M., Meyer, J., Morais, R., Saunders, L., Tyers, F. M. and Weber, G. (2020) "Common Voice: A Massively-Multilingual Speech Corpus". Proceedings of the 12th Conference on Language Resources and Evaluation (LREC 2020). pp. 4211—4215

The BiBTex is:

  author = {Ardila, R. and Branson, M. and Davis, K. and Henretty, M. and Kohler, M. and Meyer, J. and Morais, R. and Saunders, L. and Tyers, F. M. and Weber, G.},
  title = {Common Voice: A Massively-Multilingual Speech Corpus},
  booktitle = {Proceedings of the 12th Conference on Language Resources and Evaluation (LREC 2020)},
  pages = {4211--4215},
  year = 2020