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Tech riderRev. 20 Sept 2026

PolarConverter

Ch 166.3of 18 Minecraft World Converters
  1. 1Runs onNot stated by the maker
  2. 2CostsNot stated by the maker
  3. 3Source editionsMinecraft Java Edition (Anvil)
  4. 4Target editionsPolar world format
  5. 5Format conversionYes
3 lines stated Written from the maker's own pages: github.com
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Overview

PolarConverter is ranked #16 of 18 in Minecraft world converters on Specifiction.

Compared on Minecraft world converters

Source editions
Minecraft Java Edition (Anvil)github.com
Target editions
Polar world formatgithub.com
Format conversion
Yesgithub.com

Facts

Purpose
PolarConverter is a Java command-line tool that converts Minecraft Java Edition worlds from Anvil format to Polar format for Minestom-based servers using the Polar engine.github.com · 4 Oct 2026
Full-world conversion
The converter can process an entire world.github.com · 4 Oct 2026
Partial conversion
An optional radius limits conversion to chunks within that radius of coordinates (0,0).github.com · 4 Oct 2026
Version requirement
The world’s DataVersion must match the Minestom server’s supported version; otherwise conversion stops with an error.github.com · 4 Oct 2026
Input requirements
The project requires Java 25+ and a Java Edition Anvil world containing a region folder and level.dat file.github.com · 4 Oct 2026
Conversion process
It starts a minimal offline Minestom server for block registries and NBT support, reads Anvil chunks, converts blocks and metadata, and writes a .polar file.github.com · 4 Oct 2026
Dependencies
The listed dependencies are Minestom, a Minecraft server library, and Polar, which provides Polar world format support.github.com · 4 Oct 2026
License
The project is licensed under the MIT License.github.com · 4 Oct 2026
Intended users
The project describes compatibility with Minestom-based servers and identifies Minecraft Java Edition Anvil worlds as its input.github.com · 4 Oct 2026
Maker profile
The GitHub profile describes its developer as focused on creating software, usually for Minecraft.github.com · 4 Oct 2026
Conversion scope
It supports full world conversion or conversion within a specified chunk radius around (0,0).github.com · 7 Oct 2026
Version check
Before converting, it checks that the world's DataVersion matches the Minestom server's supported version.github.com · 7 Oct 2026
Requirements
The README lists Java 25 or later and a Minecraft Java Edition world in Anvil format as requirements.github.com · 7 Oct 2026
Input files
The input world folder must contain a region folder and level.dat file.github.com · 7 Oct 2026
Output
The converter writes the result as a .polar file.github.com · 7 Oct 2026
Operation
The tool starts a minimal offline Minestom server to provide block registries and NBT support during conversion.github.com · 7 Oct 2026
Notable limit
Conversion stops with an error when the world's DataVersion does not match the version supported by Minestom.github.com · 7 Oct 2026
Downloads
The GitHub releases page states that there are no releases.github.com · 7 Oct 2026

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Where it ranks on Specifiction

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Sources