UUID Generator

Generate RFC 4122 compliant UUIDs (Universally Unique Identifiers) in various formats. Perfect for databases, APIs, and unique identifier needs.

UUID Version

UUID v4 (Random)

Random or pseudo-random UUID

UUID v1 (Time-based)

MAC address + timestamp

UUID v5 (Name-based)

SHA-1 hash of namespace + name

Generation Options

Quantity

Format

Generated UUIDs

Click "Generate UUIDs" to create unique identifiers

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Understanding UUIDs

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across time and space. It's also known as a GUID (Globally Unique Identifier).

• 128-bit length: 32 hexadecimal characters
• Globally unique: Extremely low collision probability
• Standard format: 8-4-4-4-12 character pattern
• RFC 4122 compliant: Follows internet standards

UUID Versions

• UUID v1: Time-based with MAC address
• UUID v4: Random or pseudo-random
• UUID v5: Name-based using SHA-1 hash

📝 Example UUID

550e8400-e29b-41d4-a716-446655440000

🎯 Common Use Cases

• Database primary keys
• API request/response IDs
• File names and temporary URLs
• Session identifiers
• Distributed system coordination

💡 Pro Tips

• Use UUID v4 for most applications
• UUID v5 is deterministic (same input = same UUID)
• UUIDs are URL-safe when no hyphens are used
• Consider performance impact in high-volume systems