MC Version Converter review
A free open-source batch converter for Java world version downgrades.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MC Version Converter is a free, open-source command-line tool for Minecraft: Java Edition worlds saved in version 26.1 or later. It is designed for players, server operators, and technical users who need to convert newer Java worlds into structures readable by Java Edition versions 1.18.2 through 1.21.11. The tool rebuilds legacy world folder layouts and level.dat data while converting item components, entity equipment, selected entity fields, attributes, sign text, JSON text data, and other NBT data. It writes results to new output folders, leaving the original world preserved.
The pricing model is straightforward: MC Version Converter is open source and has a free plan. It is distributed as source code and can be built for Windows, Linux, or macOS. Its command-line format supports batch conversion of multiple worlds, which suits recurring migration work better than a single-world utility. World information and supported-version commands also provide a way to inspect conversion scope before processing a world.
Its main constraint is version scope. The supported source is Minecraft: Java Edition 26.1 or later, while the supported targets run from 1.18.2 through 1.21.11. Java Edition 1.17.x and older worlds are outside that range, and the tool does not convert between Java and Bedrock. It is also unofficial and is not affiliated with Mojang or Microsoft. Choose MC Version Converter when batch Java downgrades, open-source distribution, and preservation of substantial world data matter; choose another option when Bedrock conversion, older source worlds, or a graphical workflow is required.
MC Version Converter pros and cons
- Where it wins
- Converts multiple Java worlds in one batch workflow.
- Preserves entities, attributes, signs, components, and metadata.
- Writes converted worlds to new output folders, preserving originals.
- Where it doesn't
- Supports Java Edition only, not Java-to-Bedrock conversion.
- Conversion targets are limited to versions 1.18.2 through 1.21.11.
- Java Edition 1.17.x and older worlds are not supported.
MC Version Converter fact sheet, pricing and score →
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