Chunker

Overview

Chunker is a free Minecraft world converter for moving between Java Edition and Bedrock Edition, as well as between supported game versions. It suits players and creators who want broad world-data conversion with local processing; its chief caveat is that some important data does not make the trip.

Key features

Edition and version conversion

Chunker handles Java-to-Bedrock and Bedrock-to-Java conversions, plus upgrades and downgrades across supported releases. Its range covers Bedrock 1.12.0–1.26.50 and Java 1.8.8–1.21.11 and 26.1–26.3. That breadth makes it useful for migration and version matching, though worlds outside those ranges are not a fit.

World data and inputs

Conversions can carry level settings, blocks, biomes, tile entities, multiple dimensions, containers, items and in-game maps. You can start from a world folder, ZIP archive or MCWORLD file, including by drag and drop. Work stays on the user's machine, a practical advantage for anyone who prefers not to upload world files.

The coverage is not complete: entities and player inventories are not converted, and structure data such as villages and strongholds is unsupported or limited. If a world depends on those elements, expect gaps and consider whether they can be replaced or handled another way.

Reusable controls and CLI

Conversion and export settings can be adjusted and saved for later use, which helps with repeat workflows. A command-line interface offers a route to automation and workflow integration, but it requires Java 17 or higher. The project is open source under the MIT license, with its code available on GitHub.

Pricing

Chunker is completely free: the Free plan costs nothing and includes Java and Bedrock world conversion. There is no paid tier or trial to weigh against it. That makes it accessible for occasional conversions and recurring workflows alike, although the free price does not remove the data-coverage limits.

Platforms

Chunker supports Windows, macOS and Linux, along with a web interface and Java CLI. This range accommodates desktop use and command-line workflows; the CLI's Java 17-or-higher requirement matters if you plan to integrate it into an existing setup. The supported world formats are Bedrock 1.12.0–1.21.130 and 1.26.0–1.26.50, and Java 1.8.8–1.21.11 and 26.1–26.3.

Who it's for

Chunker is a strong fit for Minecraft players and creators moving worlds across editions or supported versions, especially when local processing, reusable settings or a CLI matter. It is a weaker choice for worlds whose entities, player inventories or structures must be preserved, and for anyone working outside its supported version ranges.

Pros and cons

• Pros: Converts between both Minecraft editions and supports version upgrades and downgrades across a broad stated range.
• Pros: Handles several kinds of world data and accepts folders, ZIP archives and MCWORLD files, including drag-and-drop input.
• Pros: Local processing, reusable conversion settings and a CLI support privacy-conscious and repeat workflows.
• Pros: Free use and an MIT license make it accessible without a paid plan.
• Cons: Entities and player inventories are not converted, while structure data may be unsupported or limited.
• Cons: The CLI requires Java 17 or higher, an extra prerequisite for command-line users.

Alternatives

MC Version Converter is a narrower free option for Java Edition 26.x worlds that need conversion to versions 1.18.2–1.21.11; choose it when that specific range is the task. Java2Nukkit World Converter is aimed at Java Edition 1.15.2 and requires optimized worlds and Java 1.8 or higher, so it suits that more specific setup. Server to Singleplayer World Converter is a free browser-based option for Java and Bedrock conversion.

LegacyEditor, LCE2JE and Chunkoid are other free options; Chunkoid is Android-only. WorldSwitch offers free web conversions for uploaded files up to 70 MB, with paid per-conversion tiers above that size. Universal Minecraft Tool has a free Windows tier limited to editing world settings and a paid yearly plan for full access to its apps. Browse Minecraft World Converters, Game Modding Tools or Minecraft World Editors for more options.

Verdict

Choose Chunker if you need free, local conversion between Java and Bedrock or supported game versions, with flexible inputs and a CLI for repeat work. Look elsewhere if preserving entities, player inventories or structure data is essential, or if your world falls outside its supported formats.