🔑 UUID Generator
Generate unique identifiers (UUIDs/GUIDs) instantly
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUIDs are designed to be unique across all space and time without requiring a central registration authority.
The standard format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx where each x is a hexadecimal digit. This gives 2128 possible UUIDs.
GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. They are functionally identical.
UUID Versions
| Version | Name | Description |
|---|---|---|
| v1 | Timestamp | Based on timestamp and MAC address |
| v3 | MD5 Hash | Namespace + name hashed with MD5 |
| v4 | Random | Randomly generated (this tool uses v4) |
| v5 | SHA-1 Hash | Namespace + name hashed with SHA-1 |
| v7 | Unix Timestamp | Time-ordered with Unix timestamp |
This tool generates Version 4 (random) UUIDs using cryptographically secure random numbers.
Common Use Cases
🗄️ Database Primary Keys
Use UUIDs instead of auto-incrementing integers for distributed databases, data merging, and security (IDs aren't guessable).
🔌 API Identifiers
Identify resources in REST APIs without exposing sequential IDs. Perfect for user IDs, session tokens, and resource references.
📁 File Naming
Generate unique filenames for uploads, temp files, and cache entries without collision risk.
🔗 Distributed Systems
Create IDs across multiple servers without coordination. Essential for microservices and event sourcing.
Frequently Asked Questions
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🔒 100% Private
All UUIDs are generated locally in your browser using cryptographically secure randomization. Nothing is ever sent to any server.