Specifically for version-based issues, PureGero's tool helps convert newer .schem files back to legacy .schematic files, which can sometimes resolve compatibility gaps. How to Use a Downloaded Converter
A popular lightweight tool specifically designed to convert between .litematic and WorldEdit .schematic formats. You can find the .jar executable on the Lite2Edit GitHub Releases page. schematic file to litematica converter link
The most reliable way to convert files without external software is to use the mods themselves as a bridge. Specifically for version-based issues
Click the convert button. The new .litematic file will usually appear in the same folder as the original. Quick Comparison of Formats schematic file to litematica converter link
This Java-based utility supports conversion between various formats, including .schem , .schematic , and .litematic . It requires Java 21 or later to run.