NBT Changer

The NBT Changer modifies the world files directly by changing specific values.

The following values can be changed:

Field	Type	Description
LightPopulated	byte	Whether the light levels for the chunk have been calculated. If this is set to 0, converting a world from 1.12.x to 1.13 will omit that chunk. Allowed values are 0 and 1
DataVersion	int	Allows to change the DataVersion of the chunks. Should be used with extreme care.
InhabitedTime	long	This field stores the amount of game-ticks players have spent in a chunk. Impacts the local difficulty.
Timestamp	int	The time in epoch seconds when the chunk was last saved.
LastUpdate	long	The time in ticks since world creation when the chunk was last saved.
Status	String	The status of the chunk generation. Only recognized by Minecraft 1.13+ (DataVersion 1444+)
Biome	String/int	A biome name or ID. This sets all biomes of this chunk to a single biome. For a reference of biome names and IDs, have a look at the Wiki. Custom biomes can be specified by using single quotes (') around a biome ID.
ReplaceBlocks	String	A comma separated list of block replacements in the format <block-name>=<block-name|block-nbt>[;<tile-nbt>]. Custom block names can be specified by surrounding them with single quotes.
DeleteEntities	boolean	If set to 1 or true, all entities in that chunk will be deleted.
DeleteSections	boolean	One or a range of section indices. A range has the format <from>:<to>, inclusive. Omitting <from> sets the lowest possible value, omitting <to> sets the highest possible value. : or true means all sections. Multiple ranges or single indices can be defined by separating them with a comma.
FixStatus	boolean	Will look for chunks that have terrain data, but their Status is set to empty and sets their Status field to full. Having terrain data but the Status set to empty can sometimes happen when upgrading the world through a long upgrade path, e.g. from Minecraft 1.12 directly to 1.16.

Once the field is highlighted in green, the value is considered valid and will be changed. A gray field, no matter its content, will be ignored.

A string representation of the to-be-changed fields is printed in a text field below the editor. When entering a valid string into this field directly, press Enter to parse it into the editor.

For more information about the fields have a look at the chunk format description on Minecraft Wiki.