LibreTranslate

libretranslate.com · AI

AI API Key Free Tier Translation NLP Language

Free and open-source machine translation API — translate text between 30+ languages. Self-hostable for full privacy. Public instance available with API key (free tier available).

Authentication

API Key Free API key at libretranslate.com. Pass as api_key in request body. Can also self-host for unlimited use.

Sample Requests

POST Translate text

Translate English to Spanish.

https://libretranslate.com/translate

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

Content-Type

application/json

Request Body — data you're sending

{
  "q": "Hello, world!",
  "source": "en",
  "target": "es",
  "api_key": "YOUR_KEY"
}

curl -X POST "https://libretranslate.com/translate" \
  -H "Content-Type: application/json" \
  -H "Content-Type: application/json" \
  -d '{"q":"Hello, world!","source":"en","target":"es","api_key":"YOUR_KEY"}'

import requests
headers = {
    "Content-Type": "application/json"
}
data = {
    "q": "Hello, world!",
    "source": "en",
    "target": "es",
    "api_key": "YOUR_KEY"
}
response = requests.post(
    "https://libretranslate.com/translate",
    headers=headers,
    json=data,
)
print(response.json())

const url = 'https://libretranslate.com/translate';

const response = await fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
  "q": "Hello, world!",
  "source": "en",
  "target": "es",
  "api_key": "YOUR_KEY"
}),
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"bytes"
	"encoding/json"
)

func main() {
	targetURL := "https://libretranslate.com/translate"
	jsonData, _ := json.Marshal({"q":"Hello, world!","source":"en","target":"es","api_key":"YOUR_KEY"})
	req, _ := http.NewRequest("POST", targetURL, bytes.NewBuffer(jsonData))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://libretranslate.com/translate")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Post.new(uri)
req["Content-Type"] = "application/json"
req["Content-Type"] = "application/json"
req.body = "{\"q\":\"Hello, world!\",\"source\":\"en\",\"target\":\"es\",\"api_key\":\"YOUR_KEY\"}"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://libretranslate.com/translate";
$opts = ["http" => [
    "method" => "POST",
    "header" => implode("\r\n", [
        "Content-Type: application/json",
        "Content-Type: application/json"
    ]),
    "content" => json_encode({"q":"Hello, world!","source":"en","target":"es","api_key":"YOUR_KEY"}),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

POST Detect language

Detect the language of a text.

https://libretranslate.com/detect

Hover any highlighted part to learn what it does

Headers — extra info sent with the request

Content-Type

application/json

Request Body — data you're sending

{
  "q": "Bonjour le monde",
  "api_key": "YOUR_KEY"
}

curl -X POST "https://libretranslate.com/detect" \
  -H "Content-Type: application/json" \
  -H "Content-Type: application/json" \
  -d '{"q":"Bonjour le monde","api_key":"YOUR_KEY"}'

import requests
headers = {
    "Content-Type": "application/json"
}
data = {
    "q": "Bonjour le monde",
    "api_key": "YOUR_KEY"
}
response = requests.post(
    "https://libretranslate.com/detect",
    headers=headers,
    json=data,
)
print(response.json())

const url = 'https://libretranslate.com/detect';

const response = await fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
  "q": "Bonjour le monde",
  "api_key": "YOUR_KEY"
}),
}); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"bytes"
	"encoding/json"
)

func main() {
	targetURL := "https://libretranslate.com/detect"
	jsonData, _ := json.Marshal({"q":"Bonjour le monde","api_key":"YOUR_KEY"})
	req, _ := http.NewRequest("POST", targetURL, bytes.NewBuffer(jsonData))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://libretranslate.com/detect")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Post.new(uri)
req["Content-Type"] = "application/json"
req["Content-Type"] = "application/json"
req.body = "{\"q\":\"Bonjour le monde\",\"api_key\":\"YOUR_KEY\"}"

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://libretranslate.com/detect";
$opts = ["http" => [
    "method" => "POST",
    "header" => implode("\r\n", [
        "Content-Type: application/json",
        "Content-Type: application/json"
    ]),
    "content" => json_encode({"q":"Bonjour le monde","api_key":"YOUR_KEY"}),
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

Get a free API key at libretranslate.com
POST to /translate with JSON body: {"q":"text","source":"en","target":"fr","api_key":"YOUR_KEY"}
List languages: GET /languages
Self-hosting: docker run -ti -p 5000:5000 libretranslate/libretranslate

Open documentation ↗