OpenAnyFile
What is a .nbt file?
Minecraft Named Binary Tag is a game format developed by Mojang Studios, first released in 2010. It is usually created by Minecraft Java Edition, NBTExplorer.
A binary tree of typed tags. level.dat and player files use it; decoded here as a readable tree.
File details
| Full name | Minecraft Named Binary Tag |
|---|---|
| Category | Games & mods |
| MIME type | application/x-minecraft-nbt |
| Signature (magic bytes) | 0A (TAG_Compound) or 1F 8B (gzip) |
| Developer | Mojang Studios |
| Introduced | 2010 |
| Opens with | NBT decoder |
| Uploaded? | No — read locally in your browser |
How to open a .nbt file
OpenAnyFile routes .nbt files to its NBT decoder, which shows the tag tree, readable.
- Drop your .nbt file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the NBT decoder.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the tag tree, readable. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .nbt file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .nbt files
Can I open a .nbt file without installing software?
Yes. OpenAnyFile opens .nbt files in your browser using its NBT decoder. You get the tag tree, readable, with nothing installed and no account.
How do I know a file is really a .nbt file?
Check its first bytes instead of its name. A genuine NBT file begins with 0A (TAG_Compound) or 1F 8B (gzip). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .nbt file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.