ZIP to MRPack Converter — Pack a Modpack for Modrinth Publishing

The reverse of our main tool. If you have a working .zip modpack and want to publish it on Modrinth, you need a properly-formed .mrpack with a valid manifest. This tool builds one for you.

Build a .mrpack from your .zip

Drag & drop your .zip modpack here

or click to choose a file from your device

Choose .zip File

What this tool does: reads every JAR in your ZIP's mods/ folder, looks up the matching Modrinth project for each (by SHA-512 hash), and generates a modrinth.index.json manifest. The overrides/ folder is built from your configs, scripts, and resource packs.

When to use this tool

Publishing on Modrinth. Modrinth requires the .mrpack format for modpack listings.
Migrating an old CurseForge pack. Convert your CurseForge ZIP to .mrpack for republication on Modrinth.
Sharing a small footprint version. The .mrpack is tiny because it stores URLs, not JARs.

What if a mod isn't on Modrinth?

Modrinth's .mrpack spec requires every listed mod to be downloadable from a trusted source (Modrinth, GitHub releases, mod author CDN). For mods that exist only on CurseForge, the tool flags them and they must be added to overrides/ as bundled JARs, or you must request the author to publish on Modrinth.

Privacy

Same as our other tools: the ZIP is read in your browser. Hashes are computed locally and sent only as lookup queries to the Modrinth API. The JARs themselves are never uploaded.