Convert to GridCraft

You don't have to convert anything. GridCraft opens .tmx and .tmj directly and saves them back in the same format. If all you want is a better editor for your existing files, stop here.

You convert to the GridCraft .grc format when you want one of these:

• Variable-size tiles. Sentinel-aware, no polyfill round-trip needed.
• Plugin data. Plugin-specific metadata that has no home in Tiled JSON.

How to convert

1. Open the .tmx / .tmj.
2. File → Save As. When it asks “Save in a GridCraft-capable format?”, type “grc” for the native .grc, or “json” for a readable .json variant. Both keep every feature.

Going back

File → Export As → select Tiled JSON to write the map out as .tmj. GridCraft features Tiled doesn't understand (variable tile size) get polyfilled. Everything else round-trips.