OpenTranslate API
Put AI bilingual translation inside your own product
The unified translation engine behind OpenTranslate, available by API for teams and developers. Send raw text, webpages, or documents; get back fluent bilingual translations. Access is set up with you directly.
Context-aware parsing
Preserve document structure, formatting, formulas, and HTML tags without losing context.
Multi-model routing
Route dynamically across OpenAI, Claude, DeepSeek, Gemini, and custom local models.
Production ready
High-concurrency streaming, sub-second latency, and zero data retention for complete privacy.
- 100+
- languages supported
- REST + Stream
- real-time translation endpoints
- By volume
- priced to what you run
One call in, fluent bilingual translation out
Request
curl https://api.opentranslate.co/v1/translate \-H "Authorization: Bearer $OPENTRANSLATE_API_KEY" \-H "Content-Type: application/json" \-d '{"text":"Hello world","target_lang":"zh","model":"claude-3-7-sonnet"}'
Response
{"id": "trans_9f2c41","status": "succeeded","source_lang": "en","target_lang": "zh","translated_text": "你好，世界","model_used": "claude-3-7-sonnet"}
Illustrative. Final endpoints are agreed with you at onboarding.
Who it is for
- SaaS & App LocalizationTranslate user-generated content, documents, and UI strings on the fly.
- Research & Document EnginesBatch translate scientific papers and PDF documents while preserving tables and formulas.
- Media & Subtitle PipelinesAutomate video subtitle generation and dual-language captioning.
- Enterprise Knowledge BasesBridge internal documentation and wikis across global engineering teams.
How access works
- Email us your use caseTell us what you are building, roughly how many words/requests a month, and the models you need.
- Get a key and quoteWe reply with a trial API key and volume pricing tailored to your scale.
- Integrate and go liveTest endpoints against your documents, then switch to production when ready.
API questions
How is the API priced?
By token and character volume. We quote based on your monthly request volume so you only pay for what you use.
Is there a free trial?
Yes. Approved teams receive a trial API key with preloaded credits to test against your own workflows before committing.
What are the rate limits?
Rate limits are scaled to your expected workload and can be adjusted as your throughput increases.
What happens to our data?
Translation requests are processed in isolation and never stored or used to train public AI models. Zero retention guarantees are available.
Which formats are supported?
Plain text, HTML/DOM segments, PDF documents, and subtitle formats (SRT/VTT). Contact us if you need custom format loaders.