How to Edit a DAT File | Plain Text, Binary & Minecraft

You can edit a .DAT file safely only if you know its format: plain text opens in Notepad, binary needs the original app or a specialized editor.

If you need to edit a .DAT file, the first step is figuring out what created it. .DAT is a generic extension used by countless programs, so the way to edit one depends entirely on whether it contains plain text, structured binary data, or a specific format like Minecraft NBT. Trying to open a binary DAT in a text editor can corrupt the file, while treating a plain-text DAT as binary wastes time. Here’s how to break down the challenge.

What Kind of DAT File Are You Dealing With?

The safest way to edit a .DAT file is to first determine its origin. Look at where the file lives — a game’s save folder points to a structured format, while a file in the same directory as a plain-text config file suggests plain text. If the file is small and you see readable words when you open it in a text viewer, it’s probably text. If it’s filled with gibberish, it’s binary.

The only reliable way to know is to remember which program created it. Configuration DATs from older software are often plain text; modern applications and games frequently use binary DATs for speed and data integrity.

Editing a DAT File: Identify the Format First

Regardless of method, always back up the original file before making any changes. A single wrong edit can break the application that uses it. Right-click the file, copy it to a safe folder, and work on the copy.

Using a Text Editor for Plain-Text DAT Files

If the file consists of readable text, you can edit it like any .txt file. On Windows, right-click the DAT, choose Open With > Notepad. On macOS, use TextEdit. Make your changes, then save. The file stays a DAT — don’t accidentally change its extension when saving.

This works for DAT files created by old email clients, some config tools, and data exports that use plain text. wikiHow’s Dat file editing guide covers the same basic workflow with screenshots.

Working with Binary DAT Files

Binary DATs contain structured data — game saves, program state, or proprietary formats. Editing them in Notepad scrambles the data and usually breaks the file. Instead, you need either the original application that created the file or a hex editor.

If you know the creator program (e.g., a specific game or tool), open the DAT inside that program. Many applications can export or import these files in a more editable format. If you must edit raw binary, use a hex editor like HxD (Windows) or Hex Fiend (macOS). Proceed with extreme caution — change only values you understand.

How Do You Edit a Minecraft DAT File?

Minecraft uses .DAT files for save data in NBT (Named Binary Tag) format. A regular text editor won’t work. Use a purpose-built NBT editor:

• NBTExplorer 2.8.0 (Windows) — download the .msi installer from its GitHub releases page. Open the DAT file, navigate the tree, edit values, and save.
• webNBT (any browser) — go to irath96.github.io/webNBT, load your copy of the .DAT file, edit, and download the modified version. Handy for macOS or Linux.

Always back up your world before editing a Minecraft DAT. A bad edit can crash your save.

Common DAT File Types and How to Handle Them

Tools That Make DAT Editing Easier

Your DAT Editing Checklist

1. Identify the creator program or inspect the file contents.
2. Back up the original .DAT file to a separate folder.
3. If it’s plain text, open in a text editor, edit, and save.
4. If it’s binary and formatted (e.g., Minecraft NBT), use a dedicated editor.
5. If it’s unknown binary, use a hex editor only if you know the data structure.
6. Test the edited file by opening it in the original application.