Short answer: mods are not converted

Java Edition Forge/Fabric mods cannot carry over to Bedrock. TopoBlocks’s edition conversion is a verified, one-way Java to Bedrock process that migrates world data—terrain, the vast majority of blocks, containers, and structures—not the mods that run the game. The reason is straightforward: mods are code written for Java Edition, and the Bedrock engine won’t load them, so even if you convert the world over, those mods have nowhere to run. We won’t pretend we can “convert the mods over too.”

If you want to first understand what migrates and what doesn’t overall, see What transfers from Java to Bedrock, and what doesn’t and the in-depth tutorial The complete Java to Bedrock guide.

So what happens to mod-added content?

If your map uses blocks, machines, or mechanics added by mods, here’s how the conversion handles them—and we never promise “100% lossless”:

  • Vanilla content (terrain, the vast majority of blocks, containers, structures) usually migrates normally.
  • Mod-added blocks that have a close Bedrock equivalent are replaced with compatible equivalents.
  • Blocks or mechanics with no Bedrock equivalent at all are moved into the item-by-item change report after conversion, so you know exactly what happened, line by line, with no surprises.

Before paying, you’ll first get a compatibility score, which matters especially for mod-heavy worlds—see clearly what you’ll lose before deciding whether to convert. Conversion is paid per job, failed jobs are refunded automatically, and prices are shown in-app. One more reminder: logic that mods implement with redstone/commands may also behave differently across editions—see What happens to Java redstone and command blocks in Bedrock.

Bedrock add-ons are not a replacement for mods

Bedrock has its own extension system—behavior packs/resource packs (add-ons)—but it’s a completely different thing from Java’s Forge/Fabric mods, and the two can’t be converted between each other. In other words, there is no automatic tool that turns a Java mod into a Bedrock add-on; if your gameplay relies heavily on a particular Java mod, on the Bedrock side you’ll usually need to find a functionally similar add-on and rebuild it yourself. For how Java data packs/resource packs map to Bedrock, see Can Java data packs/resource packs run on Bedrock?.

One last bit of reassurance: whatever the conversion result, TopoBlocks never overwrites your source files—your original Java world, along with its hash, is preserved and traceable, and the conversion only generates a new Bedrock copy.