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Minecraft Java Edition world data
Edit level.dat without uploading your world.
Open the main metadata file from a Java Edition world, inspect its nested NBT structure, stage precise changes, and download a newly encoded copy.
Files are parsed and rebuilt locally in your browser. Nothing is uploaded to Chunkweave.
What you can inspect
A typed view of the data behind your world.
Java Edition stores world-level settings and metadata in level.dat. Chunkweave exposes the underlying compounds, lists, strings, numbers, and arrays instead of flattening them into an unsafe text document.
Preserve NBT types
Edit values through type-aware controls so a byte, integer, long, string, or array remains explicit.
Export a separate copy
Save staged changes into a new local download. The source file selected from disk is not overwritten by the website.
A safer workflow
Work on a copy, then test deliberately.
- Back up the world.Copy the complete world folder before editing.
- Open level.dat.Select the file from the world folder in your browser.
- Review staged changes.Confirm tag types, paths, and original values.
- Export and test.Place the downloaded copy into a duplicated world before using it with an important save.
Values still need to make sense to Minecraft.
A valid NBT file can still contain a value that a particular game version, datapack, mod, or server does not expect. Chunkweave preserves structure; it cannot guarantee that every custom edit is valid gameplay data.
Common questions
Frequently asked questions
Can I edit level.dat online?
Yes. Chunkweave opens Java Edition level.dat files in your browser, lets you edit their typed NBT tree, and exports a separate copy locally.
Does Chunkweave upload my world file?
No. The file is parsed, edited, and rebuilt in your browser. Chunkweave does not receive or store its contents.
Should I back up my Minecraft world first?
Yes. Keep an untouched copy of the entire world before replacing level.dat, because invalid values or structures can prevent a world from loading correctly.
Does the editor support Bedrock Edition level.dat files?
No. This release is designed for Minecraft Java Edition data and should not be used as a Bedrock Edition level.dat editor.
Ready when your file is
Open the NBT editorInspect the structure before you change it.
Open a supported Minecraft Java Edition file, stage edits, and export a separate copy without sending world data to a server.