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Offline neural machine translation library and GUI.

Project description

Argos Translate

Demo | Website | Docs | Forum | Video intro | GitHub

Open-source offline translation library written in Python

Argos Translate uses OpenNMT for translations, SentencePiece for tokenization, Stanza for sentence boundary detection, and PyQt for GUI. Argos Translate can be used as either a Python library, command-line, or GUI application. LibreTranslate is an API and web-app built on top of Argos Translate.

Argos Translate supports installing language model packages which are zip archives with a ".argosmodel" extension with the data needed for translation.

Argos Translate also manages automatically pivoting through intermediate languages to translate between languages that don't have a direct translation between them installed. For example, if you have a es → en and en → fr translation installed you are able to translate from es → fr as if you had that translation installed. This allows for translating between a wide variety of languages at the cost of some loss of translation quality.

Supported languages

Arabic, Azerbaijani, Chinese, Czech, Danish, Dutch, English, Esperanto, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Irish, Italian, Japanese, Korean, Persian, Polish, Portuguese, Russian, Slovak, Spanish, Swedish, Turkish, Ukrainian, Vietnamese


Install from PyPI

Argos Translate is available from PyPI and can be easily installed or updated with pip.

pip3 install argostranslate

Install GUI:

pip3 install argostranslategui

Installation for macOS

  1. Download the latest macOS release.
  2. Extract the archive.
  3. Copy the .app file to the Applications directory.

Python source installation

Download a copy of this repo and install with pip.

git clone
cd argos-translate
pip install -e .



import argostranslate.package, argostranslate.translate

from_code = "en"
to_code = "es"

# Download and install Argos Translate package
available_packages = argostranslate.package.get_available_packages()
available_package = list(
        lambda x: x.from_code == from_code and x.to_code == to_code, available_packages
download_path =

# Translate
installed_languages = argostranslate.translate.get_installed_languages()
from_lang = list(filter(
	lambda x: x.code == from_code,
to_lang = list(filter(
	lambda x: x.code == to_code,
translation = from_lang.get_translation(to_lang)
translatedText = translation.translate("Hello World!")
# '¡Hola Mundo!'

LibreTranslate Web App (Demo)

Web App Screenshot

LibreTranslate API

const res = await fetch("", {
	method: "POST",
	body: JSON.stringify({
		q: "Hello!",
		source: "en",
		target: "es"
	headers: {
		"Content-Type": "application/json"}

console.log(await res.json());

    "translatedText": "¡Hola!"

Graphical user interface

The GUI code is in a separate repository.

Screenshot Screenshot2 Argos Translate macOS Screenshot


GPU Acceleration

To enable GPU support, you need to set the ARGOS_DEVICE_TYPE env variable to cuda or auto.

$ ARGOS_DEVICE_TYPE=cuda argos-translate --from-lang en --to-lang es "Hello World"
Hola Mundo

The above env variable instructs CTranslate2 to use cuda. if you encounter any issues with GPU inference please reference the CTranslate2 documentation.

HTML Translation

The translate-html library is built on top of Argos Translate and Beautiful Soup and parses and translates HTML. The LibreTranslate API also has support for translating HTML.

Files Translation

The argos-translate-files library is built on top of Argos Translate and parses and translates files. The LibreTranslate API also has support for translating files.


python3 -m pip uninstall argostranslate

You may choose to also delete temporary and cached files:

rm -r ~/.local/cache/argos-translate
rm -r ~/.local/share/argos-translate

Related Projects


Awesome Humane Tech

Contributions are welcome! Available issues are on the GitHub issues page. Contributions of code, data, and pre-trained models can all be accepted.


For support please use the LibreTranslate Forum or GitHub Issues.

For questions about CTranslate2 or general machine translation research the OpenNMT Forum is a good resource.


Custom models trained on your own data are available for $1000/each (negotiable).

Managed LibreTranslate hosting is available for $1000/mo.


If you find this software useful donations are appreciated.

  • GitHub Sponsor
  • PayPal
  • Bitcoin: 16UJrmSEGojFPaqjTGpuSMNhNRSsnspFJT
  • Ethereum: argosopentech.eth
  • Litecoin: MCwu7RRWeCRJdsv2bXGj2nnL1xYxDBvwW5
  • Bitcoin cash: qzqklgjpgutdqqlhcasmdd2hkqcelw426sxzk5qtne
  • Filecoin: f1nrnpmjxn27amidyiqrzq5mxihdo2trh2oijw2sq
  • Basic Attention Token: 0x8a16f26D277f924B04FCA5ECec64b76B5410A06c

Paid supporters receive priority support.

You can also support the project by purchasing DigitalOcean hosting with the Argos Open Tech referral link which helps to offset CDN hosting costs.


Dual licensed under either the MIT License or Creative Commons CC0.

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