📚 ReBook — AI-Powered PDF/EPUB Converter

Translate and convert e-books with state-of-the-art AI Translation • Correction • OCR • macOS • Windows • Linux • BSD • Android • 27 Languages

✨ Features

🔄 Format conversion — PDF → EPUB, EPUB → EPUB/Markdown/HTML
🤖 AI translation — Gemini 3, GPT-5, Claude 4.6, Mistral, GLM, Groq
📖 PDF OCR — Marker OCR extracts text from scans (optional)
📧 Send to Kindle — one-click delivery via email or USB
🌍 27 languages — UI auto-detects your system language
⚡ 30 parallel threads — translate entire books in minutes
🔁 Auto-retry — failed segments are automatically retried (up to 3 rounds)
⛔ Stop button — cancel running conversions at any time
🎨 Language ComboBox — pick from 27 languages with autocomplete

📦 Installation

🍎 macOS

Download ReBook.dmg (2.8 MB)
Open the DMG and drag ReBook to Applications
First launch: Right-click → Open → click Open in the Gatekeeper dialog
The setup wizard will guide you through dependency installation

⚠️ Gatekeeper: Since ReBook is not notarized, macOS may show a warning. Right-click → Open to bypass. Or run:
xattr -cr /Applications/ReBook.app

🪟 Windows

Download ReBook-Windows-Installer.exe (106 MB)
Run the installer — it creates a desktop shortcut and start menu entry
Launch ReBook and configure your AI API key in ⚙️ Settings

💡 All dependencies are bundled inside the .exe — no Python or pip required.

🐧 Linux

Download ReBook-Linux
Make it executable and run:
```
chmod +x ReBook-Linux
./ReBook-Linux
```
Configure your AI API key in ⚙️ Settings

💡 Requires python3-tk for GUI. Install if missing:
# Debian/Ubuntu
sudo apt install python3-tk
# Fedora
sudo dnf install python3-tkinter
# Arch
sudo pacman -S tk

🤖 Android

Download ReBook.apk (~60 MB)
On your phone: Settings → Security → Install from unknown sources → enable for your browser
Open the downloaded APK and tap Install
Launch ReBook and configure your AI API key in ⚙️ Settings

💡 Uses Google ML Kit for on-device PDF OCR — works offline, no additional downloads, supports 100+ languages.

👾 BSD (FreeBSD / OpenBSD / NetBSD)

Install Python 3 and Tk:

# FreeBSD
pkg install python3 py39-tkinter
# OpenBSD
pkg_add python3 py3-tkinter
# NetBSD
pkgin install python39 py39-tkinter

Clone the repo and run:

git clone https://github.com/realtek1990/rebook.git
cd rebook/bsd
python3 rebook_bsd.py

💡 BSD port uses sysctl hw.physmem for RAM detection. All other features are identical to Linux.

Installation Options (desktop, first launch)

| Option | Size | Capabilities | |--------|------|-------------| | ⚡ Light | ~100 MB | EPUB ↔ EPUB/MD/HTML + AI + Kindle | | 📦 Full | ~1.2 GB | Everything + PDF OCR (Marker + PyTorch) |

💡 Marker OCR can be installed later from ⚙️ Settings without reinstalling the app.

System Requirements

| Platform | Requirements | |----------|-------------| | 🍎 macOS | 11.0+ (Big Sur+), Apple Silicon or Intel, Python 3.9+ | | 🪟 Windows | 10/11, 64-bit, no additional dependencies | | 🐧 Linux | Ubuntu 20.04+ / Fedora 36+ / Arch, python3-tk | | 👾 BSD | FreeBSD 13+ / OpenBSD 7+ / NetBSD, python3-tk | | 🤖 Android | 8.0+ (API 26+), ~60 MB, ML Kit OCR (built-in) | | 🔑 All | API key from any supported AI provider |

🚀 Usage

Launch ReBook
Click ⚙️ Settings and configure:
- AI provider (e.g. Google Gemini)
- Model (e.g. gemini-3-flash-preview)
- API key
Drag a PDF/EPUB file onto the window (or click to browse)
Choose output format and click 🚀 Convert

Supported AI Models

| Provider | Models | |----------|--------| | Google Gemini | gemini-3-flash-preview, gemini-2.5-flash, gemini-2.5-pro | | OpenAI | gpt-5-preview, gpt-4.5-preview, gpt-4o, o3-mini | | Anthropic | claude-4.6-opus, claude-3-7-sonnet-latest | | Mistral | mistral-large-latest, mistral-medium | | ZhipuAI | glm-4-plus, glm-4-flash | | Groq | llama-3.3-70b-versatile, deepseek-r1-distill-llama-70b |

🌍 Supported Interface Languages

Auto-detected from your system language:

🇵🇱 Polski • 🇬🇧 English • 🇩🇪 Deutsch • 🇪🇸 Español • 🇫🇷 Français • 🇵🇹 Português • 🇮🇹 Italiano • 🇳🇱 Nederlands • 🇨🇿 Čeština • 🇸🇰 Slovenčina • 🇺🇦 Українська • 🇷🇺 Русский • 🇭🇺 Magyar • 🇷🇴 Română • 🇭🇷 Hrvatski • 🇷🇸 Srpski • 🇹🇷 Türkçe • 🇸🇪 Svenska • 🇳🇴 Norsk • 🇩🇰 Dansk • 🇫🇮 Suomi • 🇨🇳 中文 • 🇯🇵 日本語 • 🇻🇳 Tiếng Việt • 🇹🇭 ไทย • 🇸🇦 العربية • 🇮🇷 فارسی

📁 Project Structure

rebook/
├── ReBook.app/                   # Native macOS application
│   └── Contents/Resources/app/
│       ├── native_gui.py         # macOS GUI (Cocoa/AppKit)
│       ├── converter.py          # Conversion pipeline
│       ├── corrector.py          # AI engine (LiteLLM)
│       ├── image_translator.py   # AI image translation
│       └── i18n.py               # 27-language translations
├── windows/
│   ├── rebook_win.py             # Windows GUI (CustomTkinter)
│   ├── installer.iss             # Inno Setup script
│   └── BUILD_INSTRUCTIONS_WIN.md
├── linux/
│   ├── rebook_linux.py           # Linux GUI (CustomTkinter)
│   └── dist/                     # Build artifacts
├── bsd/
│   ├── rebook_bsd.py             # BSD GUI (sysctl RAM, POSIX paths)
│   └── dist/                     # Backend (corrector, converter, i18n)
├── android/                       # 🤖 Native Android app
│   ├── app/src/main/java/com/rebook/app/
│   │   ├── domain/               # Converter, Corrector, OcrEngine, EpubWriter
│   │   ├── ui/                   # Compose screens (Home, Settings)
│   │   └── data/                 # AppConfig (DataStore)
│   ├── app/src/main/res/         # strings.xml (EN, PL), icons
│   └── build.gradle.kts          # Gradle config
├── assets/
│   └── icon.ico                  # Multi-resolution app icon
├── .github/workflows/
│   └── build_windows.yml         # CI: builds all 5 platforms
├── build_dmg.sh                  # macOS DMG builder
├── sync_backend.sh               # Sync backend across platforms
└── README.md

⚙️ Advanced Configuration

Settings are stored in:

macOS: ~/.pdf2epub-app/config.json
Windows/Linux: ~/.rebook/config.json
Android: DataStore (internal app storage, encrypted)

{
  "llm_provider": "gemini",
  "model_name": "gemini-3-flash-preview",
  "api_key": "YOUR_GEMINI_API_KEY",
  "kindle_email": "your-kindle@kindle.com",
  "smtp_email": "your@gmail.com",
  "smtp_pass": "app-password",

  "ocr_provider": "auto",
  "ocr_api_key": "YOUR_MISTRAL_API_KEY",
  "ocr_model": "mistral-ocr-latest"
}

ocr_provider: "auto" | "mistral" | "gemini" | "marker"
ocr_api_key: leave empty to reuse the main api_key

Install Marker OCR separately

# macOS
~/.pdf2epub-app/env/bin/pip install marker-pdf

# Windows/Linux
~/.rebook/env/bin/pip install marker-pdf

📄 License

MIT License — see LICENSE

🔐 Code Signing Policy

Free code signing provided by SignPath.io,
certificate by SignPath Foundation.

Team roles:

Committers & Approvers: Owners

Privacy Policy:
ReBook does not transfer any information to networked systems unless explicitly requested by the user.

API keys entered in Settings are stored locally (config.json / Android DataStore) and sent only to the AI provider selected by the user (Gemini, Mistral, OpenAI, etc.).
OCR keys (Mistral OCR, Gemini) are sent only to the respective API endpoint during PDF processing.
No telemetry, no analytics, no tracking of any kind.
Files being converted are processed locally (Marker OCR) or sent to the cloud OCR API only if the user has configured and selected a cloud OCR provider.

Rebook

Install / Use

README