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DeepLX is a free, open-source API for DeepL translation that requires no DeepL account. It provides a simple HTTP interface to translate text using DeepL’s translation engine.

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What is DeepLX?

DeepLX acts as a reverse-engineered API wrapper for DeepL’s free translation service. It allows you to integrate high-quality translations into your applications without authentication or API keys (unless you configure them).

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Key Features

No Account Required

Use DeepL translations without signing up for a DeepL account

Multiple API Formats

Three endpoint formats: /translate, /v1/translate (Pro), and /v2/translate (official format)

Language Auto-Detection

Automatically detects source language when not specified

Translation Alternatives

Returns up to 3 alternative translations for each request

Optional Authentication

Secure your instance with access tokens

Proxy Support

Route requests through HTTP proxies

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Why Use DeepLX?

Free Access: No need to purchase DeepL API credits or manage account quotas. Simple Integration: REST API with straightforward JSON request/response format. Self-Hosted: Run your own translation service with full control over deployment. Docker Ready: Pre-built Docker images available at missuo/deeplx for easy deployment.

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How It Works

DeepLX sends translation requests to DeepL’s public endpoints with properly formatted payloads. The service handles:
  • Language detection using the whatlanggo library
  • Request formatting with proper timestamps and structure (service/service.go:129)
  • Response parsing to extract translations and alternatives (translate/types.go:126-135)
  • Multiple API endpoint formats for compatibility
DeepLX uses the free DeepL service. For high-volume production use, consider DeepL’s official API or configure DeepLX with a Pro account session.

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Supported Endpoints

EndpointDescriptionAccount Required
/translateFree API endpointNo
/v1/translatePro API endpointYes (dl_session)
/v2/translateOfficial API formatNo

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Response Format

All successful translation requests return:
translate/types.go:126-135
{
  "code": 200,
  "id": 8912375012,
  "data": "translated text",
  "alternatives": ["alternative 1", "alternative 2"],
  "source_lang": "EN",
  "target_lang": "DE",
  "method": "Free"
}
The alternatives field provides different translation options, giving you flexibility in choosing the best phrasing.

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