# How to update old maps when tilesets change in size or have their layouts changed?

**URL:** <https://discourse.mapeditor.org/t/how-to-update-old-maps-when-tilesets-change-in-size-or-have-their-layouts-changed/6586>\
**Category:** Questions\
**Created:** [February 17, 2024, 12:26pm UTC](https://discourse.mapeditor.org/t/how-to-update-old-maps-when-tilesets-change-in-size-or-have-their-layouts-changed/6586 "2024-02-17T12:26:34Z")\
**Posts on this page:** 1\
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**Author:** ![eishiya](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.mapeditor.org/eishiya/32/2534_2.png) [@eishiya](https://discourse.mapeditor.org/u/eishiya)\
**Post date:** [February 17, 2024, 2:37pm UTC](https://discourse.mapeditor.org/t/how-to-update-old-maps-when-tilesets-change-in-size-or-have-their-layouts-changed/6586/2 "2024-02-17T14:37:02Z")

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You can use the [Mass Replace Tiles script](https://github.com/eishiya/tiled-scripts/blob/main/MassReplaceTiles.js) to speed up this work. With this script, you make a map that maps each old tile to a new tile, and then you can apply that mapping to your other maps. This is easier to do if you still have the old 448x352 tileset image and map to a new tileset that respects your engine’s rules, but you can map with tiles from the same tileset too.

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_[View the full topic](https://discourse.mapeditor.org/t/how-to-update-old-maps-when-tilesets-change-in-size-or-have-their-layouts-changed/6586)._