AozoraEpub3-JDK21 Download

Latest: v1.2.5-jdk21 (December 20, 2025) | Release Notes

📦 Windows (ZIP) 🐧 Linux (TAR.GZ) 🍎 macOS (TAR.GZ)

📋 View all releases

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About This Project

This software is a derivative of AozoraEpub3 by hmdev, updated for Java 21 (LTS) compatibility and support for modern operating systems.

It aims to comply with EPUB 3.3 and the Japanese Book Publishing Association (電書協) EPUB 3 Production Guide, validated with epubcheck 5.x.

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System Requirements

• Java 21 or later (JRE / JDK)
• Windows / macOS / Linux

If you don’t have Java installed, download Eclipse Temurin Java 21 LTS.

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Install Java 21 (Eclipse Temurin)

Windows

1. Visit Adoptium Releases
2. Select JDK 21 → Windows x64 → .MSI
3. Double-click the MSI file and follow the installer
4. Verify in Command Prompt: java -version

macOS

1. Visit Adoptium Releases
2. Select JDK 21 → macOS → .PKG (Intel or Apple Silicon M1/M2)
3. Double-click the PKG file and follow the installer
4. Verify in Terminal: java -version

Linux (Ubuntu/Debian)

1. Visit Adoptium Releases
2. Select JDK 21 → Linux x64 → .TAR.GZ
3. Extract: tar -xzf OpenJDK21U-jdk_x64_linux_hotspot_21_x.tar.gz
4. Verify: ./jdk-21.x.x+yy/bin/java -version or add to PATH

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Quick Start (Windows)

1. Download the latest ZIP file from Releases
2. Extract to any folder
3. Double-click AozoraEpub3.bat to launch
4. The GUI will open when ready

Note: If double-clicking the JAR file doesn’t work, use the BAT file instead.

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Installation (macOS / Linux)

1. Download the TAR.GZ file from Releases
2. Extract: tar -xzf AozoraEpub3-*.tar.gz
3. Navigate to the folder and run: ./AozoraEpub3.sh
4. If you get a permission error, first run: chmod +x AozoraEpub3.sh

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Command Line Usage

For advanced configuration, you can run from the command line:

java -jar AozoraEpub3.jar -of -d out input.txt

To launch the GUI, run without arguments: java -jar AozoraEpub3.jar

See the README for detailed options.

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Troubleshooting

• Java is not installed — Download Java 21 JRE from Temurin and install.
• JAR file won’t open on Windows — Use the BAT file, or launch from Command Prompt with java -jar AozoraEpub3.jar.
• Permission denied on Linux/macOS — Run chmod +x AozoraEpub3.sh and try again.
• Other issues — Report on GitHub Issues.

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Related Resources

• GitHub README — Features & detailed settings
• EPUB 3.3 Guide — Changes from 3.0 and support status
• 日本語 — このページを日本語で表示