LibreTranslate

Free and Open Source Machine Translation API, entirely self-hosted. Unlike other APIs, it doesn't rely on proprietary providers such as Google or Azure to perform translations.

Try it online! | API Docs

API Examples

Request:

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

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

Response:

{
    "translatedText": "¡Hola!"
}

Build and Run

You can run your own API server in just a few lines of setup!

Make sure you have installed Python (3.8 or higher), then simply issue:

git clone https://github.com/uav4geo/LibreTranslate --recurse-submodules
cd LibreTranslate
pip install -r requirements.txt
python main.py [args]

Then open a web browser to http://localhost:5000

Run with Docker

Simply run:

docker run -ti --rm -p 5000:5000 libretranslate/libretranslate

Then open a web browser to http://localhost:5000

Build with Docker

Make sure you cloned the models submodule before building the Docker image:

docker build -t libretranslate .

Run the built image:

docker run -it -p 5000:5000 libretranslate [args]

Or build and run using docker-compose:

docker-compose up -d --build

Feel free to change the docker-compose.yml file to adapt it to your deployment needs, or use an extra docker-compose.prod.yml file for your deployment configuration.

Arguments

Argument	Description	Default
--host	Set host to bind the server to	`127.0.0.1`
--port	Set port to bind the server to	`5000`
--char-limit	Set character limit	`No limit`
--req-limit	Set maximum number of requests per minute per client	`No limit`
--batch-limit	Set maximum number of texts to translate in a batch request	`No limit`
--ga-id	Enable Google Analytics on the API client page by providing an ID	`No tracking`
--debug	Enable debug environment	`False`
--ssl	Whether to enable SSL	`False`
--frontend-language-source	Set frontend default language - source	`en`
--frontend-language-target	Set frontend default language - target	`es`

Roadmap

Help us by opening a pull request!

A docker image (thanks @vemonet !)
Auto-detect input language (thanks @vemonet !)
User authentication / tokens
Language bindings for every computer language

FAQ

Can I use your API server at libretranslate.com for my application in production?

The API on libretranslate.com should be used for testing, personal or infrequent use. If you're going to run an application in production, please get in touch to discuss options.

Credits

This work is largely possible thanks to Argos Translate, which powers the translation engine.

License

GNU Affero General Public License v3

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