Java2Nukkit World Converter

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Score7.1

Rank#3 of 18

PriceFree

Free planYes

Runs onLinux, macOS, Windows

Summary

Java2Nukkit World Converter converts Minecraft Java Edition 1.15.2 anvil worlds into Nukkit's anvil world format. It runs from a terminal with a Java JAR and source and destination world directories, and requires Java 1.8 or newer. The source world must be optimized using Minecraft 1.15.2; other versions or unoptimized worlds may convert incorrectly or crash. The converter can also be used as a Kotlin or Java library, although its API has no customizations. Its API supports choosing regions to convert; leaving the filter unchanged converts everything. Conversion is limited to the overworld, and entities are not carried over except item frames. Unsupported blocks and items may be replaced or removed because of Bedrock Edition or Nukkit limitations. Custom player heads are skipped by default, but an option can keep them as regular Steve heads. This is format conversion only, not Java-to-Bedrock or version conversion. The MIT license permits use, modification, and distribution without charge, but the software is supplied without warranty. The project directs users to GitHub issues for questions.

Who it is for

This tool suits users who need to convert optimized Minecraft Java Edition 1.15.2 worlds to Nukkit's anvil format. It is aimed at people comfortable running a Java JAR from a terminal or using a Java or Kotlin library.

What is good

Free under the MIT license.
Can convert selected regions through its API.
Can be used as a Java or Kotlin library.
Custom heads can be kept as regular Steve heads.

What to know first

Only optimized Minecraft 1.15.2 worlds are supported.
Only overworld dimensions are converted.
Entities are not converted except item frames.
Provided without warranty.

Verdict

Java2Nukkit World Converter handles a specific world-format conversion, with strict source-world requirements and limits on dimensions and entities. Confirm those constraints fit your world before using it.

Java2Nukkit World Converter plans and pricing

All plans

MIT-licensed software Free Minecraft Java Edition 1.15.2 · optimized worlds required · Java 1.8+ github.com · 30 Sept 2026

Compared on Minecraft world converters

Free plan: Yesgithub.com
Source editions: Minecraft Java Edition 1.15.2github.com
Target editions: Nukkit Anvil world formatgithub.com
Java-Bedrock conversion: Nogithub.com
Version conversion: Nogithub.com
Format conversion: Yesgithub.com
Preserves entities: Nogithub.com

Facts

Purpose: Converts Minecraft 1.15.2 Java Edition anvil worlds to Nukkit's anvil world format.github.com · 30 Sept 2026
Command line: Runs from a terminal with a Java JAR and source and destination world directories.github.com · 30 Sept 2026
Java requirement: Requires Java 1.8 or newer.github.com · 30 Sept 2026
World requirement: Source worlds must be optimized using Minecraft 1.15.2; other versions or unoptimized worlds may convert incorrectly or crash.github.com · 30 Sept 2026
Library API: Can be used as a library from Kotlin or Java, although its API is described as having no customizations.github.com · 30 Sept 2026
Dependency distribution: The library is shared through JCenter with dependencies from SpigotMC and the orangy Maven repository.github.com · 30 Sept 2026
Region selection: The API supports selecting regions for conversion, while leaving the filter unchanged converts everything.github.com · 30 Sept 2026
Unsupported entities: No entities are converted except item frames, which are blocks in Bedrock Edition.github.com · 30 Sept 2026
Dimension limit: Only overworld dimensions are supported; Nether and The End are not converted.github.com · 30 Sept 2026
Head handling: Custom player heads are skipped by default and can be retained as regular Steve heads with the keep-custom-heads option or skipSkinHeads setting.github.com · 30 Sept 2026
Compatibility handling: Unsupported blocks and items are replaced or removed because of Bedrock Edition or Nukkit limitations.github.com · 30 Sept 2026
License: The MIT license grants use, copying, modification, publishing, distribution, sublicensing, and sale free of charge.github.com · 30 Sept 2026
Warranty: The software is provided as-is without warranty, and the project disclaims responsibility for damage caused by the tool.github.com · 30 Sept 2026
Support: Users are directed to open a GitHub issue for questions, which the README says will be replied to soon.github.com · 30 Sept 2026