Local Translator (Offline AI)

Translate text instantly in your browser using local AI. No data leaves your device.

100% Private & Secure

Your data never leaves your browser

First-time use downloads AI models (~~75MB) to your browser. Your data is processed locally and never uploaded.
Language Settings
Select source and target languages for translation
Some language pairs are disabled due to missing direct AI models. Select English as source or target for full compatibility.
Source Text
Enter the text you want to translate

How to Translate Text Locally?

1

Enter Your Text

Type or paste text in English or Chinese. The AI model runs entirely in your browser.

2

Choose Direction

Select translation direction: English to Chinese or Chinese to English. Models are cached after first download.

3

Get Translation

Click translate to get instant results. Your text never leaves your device - everything is processed locally.

Why Use Local AI Translation?

100% Offline Capable

After initial model download, translate without internet. Perfect for sensitive documents and air-gapped environments.

Complete Privacy

Your text is never sent to any server. Translation happens entirely in your browser using local AI.

No Rate Limits

No API quotas, no daily limits, no waiting. Translate as much as you need, whenever you need.

Free Forever

No subscription, no credits, no hidden fees. MarianMT models are open-source and free to use.

Use Cases

🔒

Confidential Documents

Translate sensitive business, legal, or personal documents without exposing them to cloud services.

✈️

Offline Translation

Translate while traveling, in areas with poor connectivity, or in secure environments without internet access.

📚

Quick Reference

Instantly translate snippets, phrases, or paragraphs while reading or writing in another language.

How It Works: MarianMT Technology

Powered by state-of-the-art neural machine translation running locally:

Transformers.js

Uses Hugging Face's Transformers.js to run ONNX-optimized models directly in your browser via WebAssembly.

MarianMT Models

Helsinki-NLP's MarianMT models provide high-quality neural machine translation, optimized for speed.

Local Processing

Models are cached in your browser's IndexedDB. No server communication during translation.

Frequently Asked Questions

Is my text sent to any server?

No. All translation happens locally in your browser. The only network request is downloading the AI model on first use (approximately 75MB), which is then cached for future sessions.

How accurate is the translation?

MarianMT models provide good quality machine translation suitable for understanding content and quick reference. For critical documents, professional human translation is recommended.

Which languages are supported?

We support 10 languages: English, Traditional Chinese, Simplified Chinese, Japanese, Korean, French, German, Spanish, Russian, and Portuguese. Direct translation is available for pairs that have dedicated models. For unsupported pairs, translate to English first.