Minecraft Java Edition · Browser tool

Edit Minecraft world data without leaving your browser.

Inspect NBT trees, change typed values, explore region chunks, and download a safe copy. Nothing is uploaded to a server.

Local only

Runs locally
Typed tree editor
Original stays untouched

One workbench for your world files

Supported files

One workbench for the files inside your world.

Start with the formats players, map makers, and server owners reach for most often.

.dat

World & player data

Edit level.dat, playerdata, and other compressed NBT containers.

Tree editor

.nbt

Structures

Inspect structure blocks, entities, palettes, and metadata.

Tree editor

.schematic

Classic schematics

Review dimensions, block arrays, offsets, and custom tags.

Tree editor

.mca

Anvil regions

See populated chunks on a 32×32 map before opening their NBT.

Region map + tree

.mcr

Legacy regions

Browse older McRegion containers with the same focused workflow.

Region map + tree

How it works

From world file to a clean, editable tree.

The production editor follows a three-step local workflow.

01 / OPEN

Choose a file

Drop a supported Minecraft Java Edition file into the compact workbench.

02 / EDIT

Inspect and change

Search nested tags, edit typed values, and open real region chunks.

03 / EXPORT

Download a copy

The browser rebuilds the binary structure and saves a new file locally.

Private by architecture

No world uploads. No hidden storage.

The editor parses and rebuilds NBT data in a browser Web Worker. Closing the tab clears the working session.

Browser-local processingYour file does not need to leave the device.

Transparent file supportThe editor shows the detected container before changes begin.

Non-destructive exportEdits become a separate download instead of overwriting the source.

FAQ

Before you open a world file.

Does this upload my save?

No. The editor reads, validates, edits, and rebuilds files inside a browser Web Worker. Your save never leaves this device.

Which Minecraft edition is supported?

Minecraft Java Edition NBT, Anvil/McRegion containers, and classic schematic files are supported.

Can I undo a value change?

Yes. The editor workspace includes undo and redo controls before you download a copy.

What does “download copy” mean?

The production editor will re-encode the modified tag structure into a new local file, leaving the original file untouched.