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[Try it online!](https://libretranslate.com) | [API Docs](https://libretranslate.com/docs) | [Community Forum](https://community.libretranslate.com/)
[](https://pypi.org/project/libretranslate) [](https://github.com/LibreTranslate/LibreTranslate/actions?query=workflow%3A%22Run+tests%22) [](https://github.com/LibreTranslate/LibreTranslate/actions/workflows/publish-docker.yml) [](https://github.com/LibreTranslate/LibreTranslate/actions/workflows/publish-package.yml) [](https://github.com/humanetech-community/awesome-humane-tech)
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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. Instead, its translation engine is powered by the open source [Argos Translate](https://github.com/argosopentech/argos-translate) library.
[Try it online!](https://libretranslate.com) | [API Docs](https://libretranslate.com/docs)
Request:
```javascript
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:
```javascript
{
"translatedText": "¡Hola!"
}
```
### Auto Detect Language
Request:
```javascript
const res = await fetch("https://libretranslate.com/translate", {
method: "POST",
body: JSON.stringify({
q: "Ciao!",
source: "auto",
target: "en"
}),
headers: { "Content-Type": "application/json" }
});
console.log(await res.json());
```
Response:
```javascript
{
"detectedLanguage": {
"confidence": 83,
"language": "it"
},
Request:
```javascript
const res = await fetch("https://libretranslate.com/translate", {
method: "POST",
body: JSON.stringify({
source: "en",
target: "es",
format: "html"
}),
headers: { "Content-Type": "application/json" }
});
console.log(await res.json());
```
Response:
```javascript
{
You can run your own API server with just a few lines of setup!
Make sure you have Python installed (3.8 or higher is recommended), then simply run:
```bash
pip install libretranslate
libretranslate [args]
```
Then open a web browser to http://localhost:5000
If you're on Windows, we recommend you [Run with Docker](#run-with-docker) instead.
On Ubuntu 20.04 you can also use the install script available at https://github.com/argosopentech/LibreTranslate-init
If you would rather run it natively, you can follow the guide [here](https://github.com/nuttolum/LibreOnWindows).
If you want to make changes to the code, you can build from source, and run the API:
git clone https://github.com/LibreTranslate/LibreTranslate
pip install -e .
libretranslate [args]
Vincent Emonet
committed
### Run with Docker
Simply run:
```bash
docker run -ti --rm -p 5000:5000 libretranslate/libretranslate
```
Then open a web browser to http://localhost:5000
### Build with Docker
Vincent Emonet
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```bash
Vincent Emonet
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```
If you want to run the Docker image in a complete offline environment, you need to add the `--build-arg with_models=true` parameter. Then the language models are downloaded during the build process of the image. Otherwise these models get downloaded on the first run of the image/container.
Vincent Emonet
committed
Run the built image:
```bash
docker run -it -p 5000:5000 libretranslate [args]
```
Or build and run using `docker-compose`:
```bash
docker-compose up -d --build
```
> Feel free to change the [`docker-compose.yml`](https://github.com/LibreTranslate/LibreTranslate/blob/main/docker-compose.yml) file to adapt it to your deployment needs, or use an extra `docker-compose.prod.yml` file for your deployment configuration.
Vincent Emonet
committed
### CUDA
You can use hardware acceleration to speed up translations on a GPU machine with CUDA 11.2 and [nvidia-docker](https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/install-guide.html) installed.
Run this version with:
```bash
docker-compose -f docker-compose.cuda.yml up -d --build
```
| Argument | Description | Default | Env. name |
|-----------------------------|-------------------------------------------------------------------------------------------------------------| -------------------- |------------------------------|
| --host | Set host to bind the server to | `127.0.0.1` | LT_HOST |
| --port | Set port to bind the server to | `5000` | LT_PORT |
| --char-limit | Set character limit | `No limit` | LT_CHAR_LIMIT |
| --req-limit | Set maximum number of requests per minute per client | `No limit` | LT_REQ_LIMIT |
| --batch-limit | Set maximum number of texts to translate in a batch request | `No limit` | LT_BATCH_LIMIT |
| --ga-id | Enable Google Analytics on the API client page by providing an ID | `No tracking` | LT_GA_ID |
| --debug | Enable debug environment | `False` | LT_DEBUG |
| --ssl | Whether to enable SSL | `False` | LT_SSL |
| --frontend-language-source | Set frontend default language - source | `en` | LT_FRONTEND_LANGUAGE_SOURCE |
| --frontend-language-target | Set frontend default language - target | `es` | LT_FRONTEND_LANGUAGE_TARGET |
| --frontend-timeout | Set frontend translation timeout | `500` | LT_FRONTEND_TIMEOUT |
| --api-keys | Enable API keys database for per-user rate limits lookup | `Don't use API keys` | LT_API_KEYS |
| --require-api-key-origin | Require use of an API key for programmatic access to the API, unless the request origin matches this domain | `No restrictions on domain origin` | LT_REQUIRE_API_KEY_ORIGIN |
| --load-only | Set available languages | `all from argostranslate` | LT_LOAD_ONLY |
| --suggestions | Allow user suggestions | `false` | LT_SUGGESTIONS |
| --disable-files-translation | Disable files translation | `false` | LT_DISABLE_FILES_TRANSLATION |
| --disable-web-ui | Disable web ui | `false` | LT_DISABLE_WEB_UI |
Note that each argument has an equivalent environment variable that can be used instead. The env. variables overwrite the default values but have lower priority than the command aguments and are particularly useful if used with Docker. The environment variable names are the upper-snake-case of the equivalent command argument's name with a `LT` prefix.
```
pip install gunicorn
gunicorn --bind 0.0.0.0:5000 'wsgi:app'
```
You can pass application arguments directly to Gunicorn via:
```
gunicorn --bind 0.0.0.0:5000 'wsgi:app(api_keys=True)'
```
See ["LibreTranslate: your own translation service on Kubernetes" by JM Robles](https://jmrobles.medium.com/libretranslate-your-own-translation-service-on-kubernetes-b46c3e1af630)
## Manage API Keys
LibreTranslate supports per-user limit quotas, e.g. you can issue API keys to users so that they can enjoy higher requests limits per minute (if you also set `--req-limit`). By default all users are rate-limited based on `--req-limit`, but passing an optional `api_key` parameter to the REST endpoints allows a user to enjoy higher request limits.
To use API keys simply start LibreTranslate with the `--api-keys` option.
### Add New Keys
To issue a new API key with 120 requests per minute limits:
```bash
ltmanage keys add 120
```
### Remove Keys
```bash
ltmanage keys remove <api-key>
```
### View Keys
```bash
ltmanage keys
```
## Language Bindings
You can use the LibreTranslate API using the following bindings:
- Rust: https://github.com/DefunctLizard/libretranslate-rs
- Node.js: https://github.com/franciscop/translate
- .Net: https://github.com/sigaloid/LibreTranslate.Net
- Go: https://github.com/SnakeSel/libretranslate
- Python: https://github.com/argosopentech/LibreTranslate-py
- C++: https://github.com/argosopentech/LibreTranslate-cpp
- Unix: https://github.com/argosopentech/LibreTranslate-sh
You can use this [discourse translator plugin](https://github.com/LibreTranslate/discourse-translator) to translate [Discourse](https://discourse.org) topics. To install it simply modify `/var/discourse/containers/app.yml`:
```
## Plugins go here
## see https://meta.discourse.org/t/19157 for details
hooks:
after_code:
- exec:
cd: $home/plugins
cmd:
- git clone https://github.com/discourse/docker_manager.git
- git clone https://github.com/LibreTranslate/discourse-translator
...
```
Then issue `./launcher rebuild app`. From the Discourse's admin panel then select "LibreTranslate" as a translation provider and set the relevant endpoint configurations.
- [LibreTranslater](https://gitlab.com/BeowuIf/libretranslater) is an Android app [available on the Play Store](https://play.google.com/store/apps/details?id=de.beowulf.libretranslater) and [in the F-Droid store](https://f-droid.org/packages/de.beowulf.libretranslater/) that uses the LibreTranslate API.
## Web browser
- [minbrowser](https://minbrowser.org/) is a web browser with [integrated LibreTranslate support](https://github.com/argosopentech/argos-translate/discussions/158#discussioncomment-1141551).
- A LibreTranslate Firefox addon is [currently a work in progress](https://github.com/LibreTranslate/LibreTranslate/issues/55).
This is a list of public LibreTranslate instances, some require an API key. If you want to add a new URL, please open a pull request.
[libretranslate.com](https://libretranslate.com)|:heavy_check_mark:|[Buy](https://buy.stripe.com/3cs4j3a4u4c8d3i289)| [$19 / month](https://buy.stripe.com/3cs4j3a4u4c8d3i289), 80 requests / minute limit
[translate.argosopentech.com](https://translate.argosopentech.com/)|-|-
[translate.api.skitzen.com](https://translate.api.skitzen.com/)|-|-
[libretranslate.pussthecat.org](https://libretranslate.pussthecat.org/)|-|-
[translate.fortytwo-it.com](https://translate.fortytwo-it.com/)|-|-
[translate.terraprint.co](https://translate.terraprint.co/)|-|-
## Adding New Languages
To add new languages you first need to train an Argos Translate model. See [this video](https://odysee.com/@argosopentech:7/training-an-Argos-Translate-model-tutorial-2022:2?r=DMnK7NqdPNHRCfwhmKY9LPow3PqVUUgw) for details.
First you need to collect data, for example from [Opus](http://opus.nlpl.eu/), then you need to add the data to [data-index.json](https://github.com/argosopentech/argos-train/blob/master/data-index.json) in the [Argos Train](https://github.com/argosopentech/argos-train) repo.
## Roadmap
Help us by opening a pull request!
- [x] A docker image (thanks [@vemonet](https://github.com/vemonet) !)
- [x] Auto-detect input language (thanks [@vemonet](https://github.com/vemonet) !)
- [X] User authentication / tokens
- [ ] [Improved translations](https://community.libretranslate.com/t/the-best-way-to-train-models/172)
## FAQ
### Can I use your API server at libretranslate.com for my application in production?
In short, no. [You need to buy an API key](https://buy.stripe.com/3cs4j3a4u4c8d3i289). You can always run LibreTranslate for free on your own server of course.
### Can I use LibreTranslate behind a reverse proxy, like Apache2?
Yes, here is an example Apache2 config that redirects a subdomain (with HTTPS certificate) to LibreTranslate running on a docker at localhost.
```
sudo docker run -ti --rm -p 127.0.0.1:5000:5000 libretranslate/libretranslate
```
You can remove `127.0.0.1` on the above command if you want to be able to access it from `domain.tld:5000`, in addition to `subdomain.domain.tld` (this can be helpful to determine if there is an issue with Apache2 or the docker container).
Add `--restart unless-stopped` if you want this docker to start on boot, unless manually stopped.
<details>
<summary>Apache config</summary>
<br>
Replace [YOUR_DOMAIN] with your full domain; for example, `translate.domain.tld` or `libretranslate.domain.tld`.
Remove `#` on the ErrorLog and CustomLog lines to log requests.
```ApacheConf
#Libretranslate
#Redirect http to https
<VirtualHost *:80>
ServerName http://[YOUR_DOMAIN]
Redirect / https://[YOUR_DOMAIN]
# ErrorLog ${APACHE_LOG_DIR}/error.log
# CustomLog ${APACHE_LOG_DIR}/tr-access.log combined
</VirtualHost>
#https
<VirtualHost *:443>
ServerName https://[YOUR_DOMAIN]
ProxyPass / http://127.0.0.1:5000/
ProxyPassReverse / http://127.0.0.1:5000/
SSLEngine on
SSLCertificateFile /etc/letsencrypt/live/[YOUR_DOMAIN]/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/[YOUR_DOMAIN]/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/[YOUR_DOMAIN]/fullchain.pem
# ErrorLog ${APACHE_LOG_DIR}/tr-error.log
# CustomLog ${APACHE_LOG_DIR}/tr-access.log combined
</VirtualHost>
```
Add this to an existing site config, or a new file in `/etc/apache2/sites-available/new-site.conf` and run `sudo a2ensite new-site.conf`.
To get a HTTPS subdomain certificate, install `certbot` (snap), run `sudo certbot certonly --manual --preferred-challenges dns` and enter your information (with `subdomain.domain.tld` as the domain). Add a DNS TXT record with your domain registrar when asked. This will save your certificate and key to `/etc/letsencrypt/live/{subdomain.domain.tld}/`. Alternatively, comment the SSL lines out if you don't want to use HTTPS.
This work is largely possible thanks to [Argos Translate](https://github.com/argosopentech/argos-translate), which powers the translation engine.
[GNU Affero General Public License v3](https://www.gnu.org/licenses/agpl-3.0.en.html)
See [Trademark Guidelines](https://github.com/LibreTranslate/LibreTranslate/blob/main/TRADEMARK.md)