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Chunker

chunker.app

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Spec score 9.0 #1 of 25 in Game Modding Tools

What it is

Chunker converts Minecraft worlds between Java Edition and Bedrock Edition, processing worlds locally on the user's machine. It can transfer level settings and world data such as blocks, biomes, and tile entities, as well as multiple dimensions, containers, items, and in-game maps. It can upgrade or downgrade worlds between supported game versions. Inputs include world folders, ZIP archives, and MCWORLD files, with drag-and-drop support. Users can adjust conversion and export settings and save settings for later conversions. The command-line interface supports conversion and workflow integration, but requires Java 17 or higher. Entities and player inventories are not converted; structure data such as villages and strongholds is listed as unsupported or limited. Chunker is free at free and open source under the MIT license. It is available for Windows, macOS, Linux, and through a web interface. Supported versions vary by edition: the listed ranges are Bedrock 1.12.0–1.26.50 and Java 1.8.8–1.21.11 and 26.1–26.3. Check compatibility before converting a world.

Spec sheet

What it does
Chunker converts Minecraft worlds between Java Edition and Bedrock Edition and can upgrade or downgrade game versions.Read 19 Oct 2026 · github.com
Purpose
Chunker converts Minecraft worlds between Java Edition and Bedrock Edition.Read 3 Oct 2026 · github.com
Platforms
Microsoft Learn describes standalone app versions for Windows, Mac and Linux.Read 3 Oct 2026 · learn.microsoft.com
License
The repository is released under the MIT license.Read 19 Oct 2026 · github.com
Maker
Hive Games describes Chunker as an internal tool that it offers free to Minecraft partners and the general public under an exclusive licensing deal with Microsoft.Read 3 Oct 2026 · hivegames.io
Advanced settings
Users can adjust conversion settings and export settings for reuse in later conversions.Read 3 Oct 2026 · chunker.app
Build requirements
Building from source requires Git and Java 17 or newer, with Gradle optional.Read 19 Oct 2026 · github.com
CLI
Chunker includes a command-line interface that can be used for conversion and workflow integration.Read 3 Oct 2026 · github.com
CLI requirement
The CLI requires Java 17 or higher.Read 3 Oct 2026 · github.com
CLI runtime
The CLI requires Java 17 or newer.Read 19 Oct 2026 · github.com
Command line
Chunker includes ChunkerCLI for workflow integration.Read 19 Oct 2026 · chunker.app
Company founding
LinkedIn lists Hive Games as founded in 2013.Read 19 Oct 2026 · uk.linkedin.com
Company size
LinkedIn lists Hive Games as a privately held company with 11–50 employees.Read 19 Oct 2026 · uk.linkedin.com
Conversion speed
The homepage says a world can be converted in about 30 seconds.Read 19 Oct 2026 · chunker.app
Converted data
Supported conversion data includes level settings, blocks, biomes, tile entities, multiple dimensions, containers, items and in-game maps.Read 19 Oct 2026 · learn.microsoft.com
Current release
The GitHub releases page lists version 1.21.0, released October 2, 2026.Read 3 Oct 2026 · github.com
Desktop platforms
Microsoft documents standalone versions for Windows, macOS and Linux, alongside the command-line version.Read 19 Oct 2026 · learn.microsoft.com
Entity limitation
Entities and player inventories generally are not converted between editions.Read 19 Oct 2026 · learn.microsoft.com
Extensibility
CLI parameters support block, biome, dimension, world-setting, pruning and converter-mapping JSON inputs.Read 19 Oct 2026 · github.com
Funding
The repository states that Chunker receives funding from Mojang Studios.Read 19 Oct 2026 · github.com
Independent review
James A. Chambers praised the easy world and version conversion workflow but documented upload limits, queues and missing entities and inventories.Read 19 Oct 2026 · jamesachambers.com
Input formats
The application accepts a world folder, ZIP archive or MCWORLD file, including drag and drop.Read 19 Oct 2026 · learn.microsoft.com
Inputs
The app accepts world folders, ZIP archives and MCWORLD files, and can also accept drag-and-drop inputs.Read 3 Oct 2026 · learn.microsoft.com
Latest release
Version 1.21.0 was released on 2 October 2026 with Bedrock 1.26.60 support, custom-block NBT handling and reduced memory use for large worlds.Read 19 Oct 2026 · github.com
Legacy web app
The 2024 announcement said the legacy web application would be available only until the end of 2024 and encouraged migration to the open-source release.Read 19 Oct 2026 · playhive.com
Legal entity
Companies House identifies the maker as active private company HIVE GAMES LIMITED, company number 08451891, incorporated on 19 March 2013.Read 19 Oct 2026 · find-and-update.company-information.service.gov.uk
Limit: conversion defects
A Reddit MinecraftHelp report described deleted slabs, lighting problems and absent mobs after conversion, alongside a file-size limit.Read 19 Oct 2026 · reddit.com
Limit: large worlds
A Reddit commenter said a roughly 3 GB world exceeded an approximately 1.5 GB limit and failed to convert.Read 19 Oct 2026 · reddit.com
Limit: missing entities
A GitHub issue reports boats, minecarts and mobs are not converted, consistent with the project's documented entity limitation.Read 19 Oct 2026 · github.com
Limit: WorldEdit compatibility
A Reddit report described missing or partially missing blocks when converting a WorldEdit-created Java world and cited a 500 MB upload limit.Read 19 Oct 2026 · reddit.com
Local processing
Microsoft documentation says worlds are converted locally on the user's machine.Read 19 Oct 2026 · learn.microsoft.com
Maker relationship
LinkedIn says Hive Games works with Microsoft as a vendor on projects including Chunker World Converter.Read 19 Oct 2026 · uk.linkedin.com
Memory behavior
The desktop application defaults to using up to 75% of available memory and permits JVM memory overrides.Read 19 Oct 2026 · github.com
Microsoft status
Microsoft documentation identifies Chunker as an external third-party project rather than a Mojang or Microsoft offering.Read 19 Oct 2026 · learn.microsoft.com
Open source
The project publishes its source code on GitHub and describes itself as fully open source.Read 19 Oct 2026 · chunker.app
Open-source announcement
Hive announced the downloadable open-source Java CLI and GUI for Windows, Linux and macOS on 16 August 2024.Read 19 Oct 2026 · playhive.com
Organization details
Hive Games Limited lists UK company number 08451891; its opened pages do not state a founding year or headquarters.Read 3 Oct 2026 · hivegames.io
Praise: conversion reliability
An AlternativeTo reviewer called Chunker the most reliable and up-to-date converter while noting missing mob entities.Read 19 Oct 2026 · alternativeto.net
Praise: successful migration
A Reddit user reported successfully converting a three-year Bedrock survival world and thanked the developers.Read 19 Oct 2026 · reddit.com
Pricing
The official site describes Chunker as completely free.Read 19 Oct 2026 · chunker.app
Rating on AlternativeTo
5 out of 5 from 1 reviewRead 19 Oct 2026 · alternativeto.net
Registered office
Companies House lists Tower Court, Oakdale Road, Clifton Moor, York YO30 4XL as the registered office.Read 19 Oct 2026 · find-and-update.company-information.service.gov.uk
Security reporting
The security policy directs vulnerability reports to [email protected] and asks reporters not to use public issues.Read 19 Oct 2026 · github.com
Settings export
Users can export conversion settings for reuse in later conversions.Read 19 Oct 2026 · chunker.app
Structure limitation
The README lists structure data such as villages and strongholds as unsupported.Read 19 Oct 2026 · github.com
Support policy
The Hive announcement says its server volunteer and support teams do not provide Chunker support.Read 19 Oct 2026 · playhive.com
Supported editions
The repository lists Bedrock versions from 1.12.0 through 1.21.130 and 1.26.0 through 1.26.60, plus Java versions from 1.8.8 through 1.21.11 and 26.1 through 26.3.Read 19 Oct 2026 · github.com
Unsupported data
Entities and player inventories are not currently converted; the repository also lists structure data such as villages and strongholds as unsupported or limited.Read 3 Oct 2026 · learn.microsoft.com
Version conversion
Chunker can upgrade and downgrade worlds between different game versions.Read 3 Oct 2026 · github.com
World data
Chunker can convert level settings, world data including blocks, biomes and tile entities, multiple dimensions, containers and items, and in-game maps.Read 3 Oct 2026 · learn.microsoft.com

Plans and prices

Free Free Java↔Bedrock conversion · desktop app and CLI · supported Minecraft versions Read 19 Oct 2026 · chunker.app

Every Chunker plan and price →

Strong points and limits

Strong points

  • Converts worlds locally
  • Accepts folders, ZIP, and MCWORLD files
  • Supports conversion between both Minecraft editions
  • Free and open source under MIT license

Limits

  • Entities and player inventories are not converted
  • Some structure data is unsupported or limited
  • CLI requires Java 17 or higher

Who it suits

Chunker suits Minecraft players who need to move worlds between Java and Bedrock editions or across supported versions. Its local processing and CLI may also suit users integrating conversion into workflows.

Chunker in depth

Read the full write-up

Overview

Chunker converts Minecraft worlds between Java Edition and Bedrock Edition, and can also move them between supported game versions. It is best suited to players and creators who want local conversion with control over settings. Its scope is substantial for a free tool, but unsupported entities, inventories and some structure data can make it a poor fit for worlds that rely on them.

Key features

Edition and version conversion

Chunker converts worlds in both directions between Java and Bedrock and can upgrade or downgrade worlds within its supported ranges: Bedrock 1.12.0–1.26.50 and Java 1.8.8–1.21.11 and 26.1–26.3. That range makes it useful for moving many existing worlds, but check that both the source and intended destination versions are covered before relying on a conversion.

World data and inputs

It can convert level settings, blocks, biomes, tile entities, multiple dimensions, containers, items and in-game maps. World folders, ZIP archives and MCWORLD files are accepted, with drag-and-drop input as another option. Processing is local, so world files are worked with on the user's machine rather than sent elsewhere.

The omissions matter: entities and player inventories are not converted, while structure data such as villages and strongholds is unsupported or limited. If those elements are central to a world, Chunker may leave important parts behind; it is not a complete migration tool for every world.

Settings and command line

Conversion and export settings can be adjusted and saved for reuse, a practical advantage for repeat conversions that need consistent output. A command-line interface supports conversion and workflow integration, but it requires Java 17 or higher. Chunker is open source under the MIT license, with code on GitHub.

Pricing

Chunker has one plan: Free at free. It includes Java and Bedrock world conversion, and there is no paid tier or trial to weigh against it. For a one-off conversion or recurring workflow, the price is straightforward; the trade-off is the data it does not convert, not a plan cap or seat limit.

Platforms

Chunker is available through a web interface and on Windows, macOS and Linux, with a Java CLI for command-line workflows. The CLI's Java 17-or-higher requirement is relevant if you plan to automate conversions; desktop and web users need not choose it.

Who it's for

Choose Chunker if you need to move a supported Minecraft world between Java and Bedrock, change its game version, or repeat conversions with reusable settings while keeping processing local. It is less suitable when entity data, player inventories or unsupported structure data must survive intact.

Pros and cons

Pros: Free conversion between both Minecraft editions, with no trial or paid-plan decision.

Pros: Broad supported world data, multiple input formats, local processing and reusable settings give players and creators useful flexibility.

Pros: A CLI can fit conversion into command-line workflows, and the MIT license makes the code open source.

Cons: Entities and player inventories are not converted, and villages, strongholds and other structure data may be unsupported or limited.

Cons: Version support is bounded, and command-line use requires Java 17 or higher.

Alternatives

For Minecraft world conversion, see the Minecraft World Converters list. For broader game-modding software, browse Game Modding Tools; for editing Minecraft worlds rather than converting them, see Minecraft World Editors.

Minecraft Launcher is a better fit if you need the launcher rather than a world converter; its download is free, while game access requires ownership or a time-limited demo. NetRadiant-Custom is an open-source level editor with ready-to-use packages in Releases, not a Minecraft world converter. OpenMW-CS is an open-source construction set for the OpenMW game engine. QuickBMS is a free, open-source multiplatform tool. DarkRadiant is an open-source level editor that requires game resources the editor does not install. Reloaded-II is a free option with no paid plans or usage limits stated. StarCraft II Editor is for creating maps and mods for StarCraft II. UAssetGUI is MIT-licensed software.

Verdict

Chunker is a strong choice for players and creators who need free, local Java–Bedrock or version conversion across its supported ranges. Its reusable settings, broad data coverage and CLI make it more capable than a basic one-off converter. Look elsewhere or plan for manual follow-up if a world depends on entities, player inventories or structure data that Chunker does not fully carry across.

Verdict

Chunker provides free, local conversion with configurable settings and several input formats. Its unsupported data and edition-specific version ranges are important checks before converting.

Where Specifiction places it

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