Random Minecraft UUID Generator
Generate Minecraft UUIDs for online and offline mode - Version 4 random UUIDs and Version 3 username-based UUIDs
Our Minecraft UUID generator creates player UUIDs for both online (authenticated) and offline (cracked) Minecraft servers. Generate Minecraft UUIDs using Version 4 (random) for online mode with Mojang authentication, or Version 3 (name-based MD5) for offline mode using username hashing. Perfect for server development, plugin testing, player data migration, and whitelist management. Our free UUID generation API supports both Minecraft UUID formats with cryptographically secure randomness for online mode and deterministic hashing for offline mode. Export your generated Minecraft player UUIDs as text, CSV, or JSON for easy integration into server configurations.
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What is a Minecraft UUID?
Minecraft uses UUIDs (Universally Unique Identifiers) to uniquely identify players, entities, and game objects. The type of UUID used depends on whether the server is running in online (authenticated) or offline (cracked) mode.
Online Mode (v4 Random): Official Minecraft servers with Mojang authentication use Version 4 UUIDs, which are randomly generated when you register a Minecraft account. These UUIDs are permanent and tied to your account, ensuring global uniqueness and preventing player impersonation.
Offline Mode (v3 Username-based): Offline servers generate Version 3 UUIDs based on an MD5 hash of "OfflinePlayer:" followed by the username. These are deterministic - the same username always produces the same UUID. Note that usernames are case-sensitive, so "Steve" and "steve" generate different UUIDs.
Online vs Offline Mode Explained
Online Mode (Authenticated)
- Requires legitimate Minecraft account purchased from Mojang
- Server validates player identity with Mojang authentication servers
- Uses Version 4 (random) UUIDs assigned when account was created
- UUIDs are permanent and globally unique
- Recommended for public servers to prevent impersonation
Offline Mode (Cracked)
- No Mojang authentication required
- Server generates UUID based on username using MD5 hash
- Uses Version 3 (name-based) UUIDs with "OfflinePlayer:" namespace
- Same username always produces same UUID (deterministic)
- Players can impersonate others if they know the username
- Commonly used for private servers and development/testing
Common Use Cases
Configuration Options
Minecraft Mode (Online/Offline)
Username (Offline Mode Only)
Count (1-100)
How to Generate Minecraft UUIDs
[STEP 1] Select Minecraft Mode
Choose between Online Mode (v4 random UUIDs for authenticated Mojang servers) or Offline Mode (v3 username-based UUIDs for cracked servers). Online mode is recommended for public servers to prevent player impersonation.
[STEP 1] Configure Parameters
For offline mode, enter the player's exact username (case-sensitive). For online mode, simply set the count. The username in offline mode must match the in-game name exactly, including capitalization, as "Steve" and "steve" produce different UUIDs.
[STEP 1] Generate and Export
Click Generate to create your Minecraft UUIDs. Copy individual UUIDs or export all results as text, CSV, or JSON format. The mode (online/offline) and version information are included in the metadata for reference.
Minecraft UUID Best Practices
- _ Online Mode for Public Servers: Always use online mode for public servers to prevent player impersonation. Online mode validates player identity with Mojang authentication servers, ensuring secure player identification.
- _ Case Sensitivity in Offline Mode: Offline UUIDs are case-sensitive because they use MD5 hashing. "Steve" and "steve" produce completely different UUIDs. Always use the exact capitalization of the player's in-game name.
- _ Data Migration Planning: When switching between online and offline modes, all player UUIDs change. Plan for UUID conversion using plugins like UUIDConverter, and always backup your server data before attempting migration.
- _ Plugin Compatibility: Verify that your server plugins support the UUID format your server uses. Some plugins may have different behavior for online vs offline UUIDs, particularly when handling player data persistence.
- _ Backup Before Mode Changes: Always backup player data, world files, and plugin configurations before changing server authentication modes. UUID changes affect player inventories, permissions, and all stored player data.
- _ Testing with Offline Mode: Use offline mode UUIDs for local development and testing environments. This allows you to test multi-player scenarios without requiring multiple Mojang accounts or authentication servers.
Technical Implementation
Minecraft uses two different UUID generation methods depending on server authentication mode. Online mode uses cryptographically secure random generation (CSPRNG) for Version 4 UUIDs, while offline mode uses MD5 hashing for Version 3 UUIDs with a specific namespace.
// Online Mode (Version 4 - Random UUID)
Algorithm: CSPRNG Random Generation
1. Generate 128 random bits using CSPRNG
2. Set version bits (bits 48-51) to 0100 (version 4)
3. Set variant bits (bits 64-65) to 10 (RFC 4122)
4. Format as 8-4-4-4-12 hexadecimal pattern
Result: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
// Offline Mode (Version 3 - Name-based UUID)
Algorithm: MD5 Hash-based Generation
1. Create input string: "OfflinePlayer:{username}"
2. Compute MD5 hash (128-bit output)
3. Set version bits (bits 48-51) to 0011 (version 3)
4. Set variant bits (bits 64-65) to 10 (RFC 4122)
5. Format as 8-4-4-4-12 hexadecimal pattern
Result: Deterministic UUID for username
// Format Specification
Pattern: 8-4-4-4-12 (hexadecimal digits)
Example: f81d4fae-7dec-11d0-a765-00a0c91e6bf6
^^^^^^^^ ^^^^ ^^^^ ^^^^ ^^^^^^^^^^^^
time_low mid hi clk node/hash
// UUID Version Detection
Version 3 (MD5): xxxxxxxx-xxxx-3xxx-xxxx-xxxxxxxxxxxx
Version 4 (Random): xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Position 14 ^^^^