Cemu Emulator Keys.txt ((top)) -

Cemu keys.txt — Complete reference and examples

This resource explains the keys.txt file used by Cemu (Wii U emulator), why it’s required, where it comes from, its format, how to create/convert it, common issues, and practical examples. It assumes you legally own any console firmware or game keys you extract.

Error 4: DLC or Updates won’t load even though the base game works

  • Cause: DLC and game updates have their own Title IDs and thus require their own keys.
  • Fix: Your keys.txt must include separate entries for each update (0005000E prefix) and DLC (0005000C prefix). For example, Breath of the Wild base game is 0005000010144F00, but its update is 0005000E10144F00.

Method 3: Using a "keys.txt" from a Source (Proceed with Caution)

If you ignore the legal warning and choose to find a pre-made keys.txt online: cemu emulator keys.txt

  • Do not download executable files (.exe, .bat, .scr).
  • Look only for plain .txt files.
  • Use a trusted source with community verification (e.g., GitHub repos for "cemu_keys").
  • Open the file in a text editor before copying it to your Cemu folder. Check for suspicious content like long strings of gibberish outside the hex format.

Keep a Backup

keys.txt is tiny (often under 50 KB). Keep a backup on cloud storage or a USB drive. If you lose it, you will not be able to play your encrypted game dumps without re-dumping every single disc. Cemu keys

What is a Console Key?

In the context of digital security, a key is a piece of cryptographic data used to encrypt or decrypt information. The Wii U uses a hierarchical key system: Cause: DLC and game updates have their own

  • Common Key: A master key shared across all retail Wii U consoles. It decrypts the title keys.
  • Title Keys: Unique keys for each individual game or piece of DLC. They decrypt the actual game files.
  • OTP (One-Time Programmable) Keys: Console-specific keys stored in hardware.

When you rip a Wii U game disc to your PC (a process called "dumping"), the resulting files (typically in WUD or WUX format, or the loadiine folder structure) are encrypted. Without the correct keys, Cemu sees the game data as gibberish.

4. Technical Implementation

If a user has legally obtained the keys by dumping them from their own console, the technical review of the file usage is straightforward:

  • Format: The file is typically a simple text document formatted with a key name and a hash (e.g., key_name = 0000000000000000).
  • Location: For Cemu to read it, the file usually needs to be placed in a specific directory:
    • Cemu/keys.txt (in the emulator folder)
    • Or within the mlc01/usr/title/ path structure depending on the Cemu version.

Part 2: The Role of "keys.txt" in Cemu

Q: My keys.txt worked yesterday but not today. Why?

A: You may have updated CEMU. Ensure the file is still in the correct folder. Also, check that no antivirus software quarantined or altered the file (antivirus rarely targets .txt files, but it can happen).