Convert a Modpack Between Modrinth (.mrpack) and CurseForge (.zip)

Move a modpack from CurseForge to Modrinth or back, or build an .mrpack from a folder of mod JARs. Launcher method, a hash-lookup script, and what never converts.

The Two Formats Side by Side

Option 1: Check What You Have Online

Option 2: Convert Through a Launcher

Option 3: Build an .mrpack From a Folder of JARs

What Doesn't Convert Cleanly

Check the Bundled JARs

Summary