Translate Books with LLMs

Translate books, subtitles, and documents using AI - locally or in the cloud.

No size limit. Process documents of any length - from a single page to thousand-page novels. The intelligent chunking system handles unlimited content while preserving context between segments.

Perfect preservation. Your documents come out exactly as they went in: EPUB formatting, styles, and structure remain intact. SRT timecodes stay perfectly synchronized. Every tag, every timestamp, every formatting detail is preserved.

Resume anytime. Interrupted translation? Pick up exactly where you left off. The checkpoint system saves progress automatically.

Formats: EPUB, SRT, DOCX, TXT

Providers: Ollama (local), OpenRouter, OpenAI (compatible like LM Studio), Gemini

Translation Quality Benchmarks — Find the best model for your target language.

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Quick Start

Download Executable (No Python Required!)

1. Download and extract the archive for your platform
2. Install Ollama (for local AI models)
3. Run TranslateBook.exe (Windows) or ./TranslateBook (macOS)
4. Open http://localhost:5000 in your browser

Note: First run creates a TranslateBook_Data folder with configuration files.

macOS: On first launch, go to System Settings > Privacy & Security and click "Open Anyway".

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For the Bearded Ones - Install from Source

Prerequisites: Python 3.8+, Ollama, Git

git clone https://github.com/hydropix/TranslateBooksWithLLMs.git
cd TranslateBookWithLLM
ollama pull qwen3:14b    # Download a model

# Windows
start.bat

# Mac/Linux
chmod +x start.sh && ./start.sh

The web interface opens at http://localhost:5000

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LLM Providers

Provider	Type	Setup
Ollama	Local	ollama.com
OpenAI-Compatible	Local	llama.cpp, LM Studio, vLLM, LocalAI...
OpenRouter	Cloud (200+ models)	openrouter.ai/keys
OpenAI	Cloud	platform.openai.com
Gemini	Cloud	Google AI Studio

OpenAI-Compatible servers: Use --provider openai with your server's endpoint (e.g., llama.cpp: http://localhost:8080/v1/chat/completions, LM Studio: http://localhost:1234/v1/chat/completions)

See docs/PROVIDERS.md for detailed setup instructions.

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Command Line

# Basic (auto-generates "book (Chinese).epub")
python translate.py -i book.epub -sl English -tl Chinese

# With OpenRouter
python translate.py -i book.txt --provider openrouter \
    --openrouter_api_key YOUR_KEY -m anthropic/claude-sonnet-4 -tl French

# With OpenAI
python translate.py -i book.txt --provider openai \
    --openai_api_key YOUR_KEY -m gpt-4o -tl French

# With Gemini
python translate.py -i book.txt --provider gemini \
    --gemini_api_key YOUR_KEY -m gemini-2.0-flash -tl French

# With local OpenAI-compatible server (llama.cpp, LM Studio, vLLM, etc.)
python translate.py -i book.txt --provider openai \
    --api_endpoint http://localhost:8080/v1/chat/completions -m your-model -tl French

Main Options

Option	Description	Default
-i, --input	Input file	Required
-o, --output	Output file	Auto: {name} ({lang}).{ext}
-sl, --source_lang	Source language	English
-tl, --target_lang	Target language	Chinese
-m, --model	Model name	mistral-small:24b
--provider	ollama/openrouter/openai/gemini	ollama
--text-cleanup	OCR/typographic cleanup	disabled
--refine	Second pass for literary polish	disabled
--tts	Generate audio (Edge-TTS)	disabled

See docs/CLI.md for all options (TTS voices, rates, formats, etc.).

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Configuration (.env)

Copy .env.example to .env and edit:

# Provider
LLM_PROVIDER=ollama

# Ollama
API_ENDPOINT=http://localhost:11434/api/generate
DEFAULT_MODEL=mistral-small:24b

# API Keys (if using cloud providers)
OPENROUTER_API_KEY=sk-or-v1-...
OPENAI_API_KEY=sk-...
GEMINI_API_KEY=...

# Performance
REQUEST_TIMEOUT=900
MAX_TOKENS_PER_CHUNK=400  # Token-based chunking (default: 400 tokens)

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Docker

docker build -t translatebook .
docker run -p 5000:5000 -v $(pwd)/translated_files:/app/translated_files translatebook

See DOCKER.md for more options.

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Troubleshooting

Problem	Solution
Ollama won't connect	Check Ollama is running, test curl http://localhost:11434/api/tags
Model not found	Run ollama list, then ollama pull model-name

See docs/TROUBLESHOOTING.md for more solutions.

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Documentation

Guide	Description
docs/PROVIDERS.md	Detailed provider setup (Ollama, LM Studio, OpenRouter, OpenAI, Gemini)
docs/CLI.md	Complete CLI reference
docs/TROUBLESHOOTING.md	Problem solutions
DOCKER.md	Docker deployment guide

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Links

• Report Issues
• OpenRouter Models

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License: AGPL-3.0