Pdpb

# pdpb — Bidirectional E-Book Converter Engine

**pdpb** is a lightweight, professional desktop conversion engine developed by **Stone Castle Lab**, designed to convert PDF and EPUB files seamlessly with full Apple Books compatibility.

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## ✨ Key Features

* **🔄 Bidirectional Conversion:** Convert your PDF files into standard-compliant fixed-layout (FXL) EPUB format, or vice versa.

* **📚 Batch Processing Support:** Select multiple files at once to queue and process conversions effortlessly.

* **🎨 Cover & Metadata Management:** Add custom cover images (JPG, PNG, WEBP) and customize book titles and author metadata.

* **⚡ Modern UI:** Built with CustomTkinter for a sleek, fast, and user-friendly desktop experience.

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## 🚀 How to Use

1. Extract the downloaded `.zip` archive into a folder of your choice.

2. Run **`pdpb.exe`**.

3. Select your conversion mode and files through the interface, then start converting.

For detailed usage instructions, check out the **USER MANUAL.pdf** / **KULLANIM KLAVUZU.pdf** files inside the archive.

## 📜 License & Info

This software is protected under the **GNU AGPL v3.0** license.  

Source code available on [GitHub](https://github.com/muyuta/pdpb).  

© 2026 Stone Castle Lab. All rights reserved.