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Free UUID Generator Online - Create GUIDs v1, v4, v5

Professional UUID/GUID generator supporting v1 (timestamp), v4 (random), and v5 (namespace) versions. Generate single or bulk UUIDs with RFC4122 compliance, multiple formats, and instant validation. Perfect for developers, database administrators, and system architects.

UUID v4 GeneratorGUID Creator OnlineBulk UUID GenerationUUID Validator ToolRFC4122 CompliantNo Registration Required

UUID Validator

Complete Guide: UUID Generator Online for Developers 2025

UUID (Universally Unique Identifier) is a 128-bit RFC4122 standard used by millions of developers worldwide for generating unique identifiers in distributed systems, databases, and web applications. Our online UUID generator creates collision-resistant identifiers without requiring central coordination or registration.

Professional UUID Version Comparison 2025:

  • •
    UUID v1 (Timestamp-based): Uses current timestamp and MAC address.
    Best for: Time-ordered data, audit trails. Avoid for: Privacy-sensitive applications.
  • •
    UUID v4 (Random): Cryptographically random 122-bit values.
    Best for: General use, APIs, database primary keys. Most secure and recommended.
  • •
    UUID v5 (Namespace + Name): Deterministic SHA-1 hash generation.
    Best for: Reproducible IDs, content addressing, distributed caching.

Enterprise UUID Use Cases & Best Practices:

Database Systems

  • • Primary keys for distributed databases
  • • MongoDB ObjectId alternatives
  • • PostgreSQL UUID columns
  • • MySQL binary(16) storage optimization

Web Development

  • • Session identifiers for user tracking
  • • API request/response correlation IDs
  • • File upload unique naming
  • • JWT token jti (JWT ID) claims

Microservices Architecture

  • • Service instance identification
  • • Message queue correlation IDs
  • • Distributed tracing span IDs
  • • Event sourcing event identifiers

Security & Compliance

  • • GDPR-compliant pseudonymization
  • • OAuth 2.0 state parameters
  • • Cryptographic nonce generation
  • • Audit log entry identifiers

Performance Considerations:

For high-performance applications, consider using binary UUID storage (128-bit vs 36-character string), sequential UUID variants for database clustering, and UUID v4 for maximum distribution across shards. Our bulk generator supports up to 1000 UUIDs for batch operations.

UUID Properties

Total Bits
128-bit
32 hexadecimal characters
Standard Format
8-4-4-4-12
Separated by hyphens
Possible UUID Count
5.3 × 10³⁶
Nearly impossible to duplicate

Version Comparison

UUID v1
✓ Contains timestamp
✗ May leak MAC address
Use case: Time-based sorting
UUID v4
✓ Completely random
✓ Best privacy protection
Use case: Preferred for general scenarios
UUID v5
✓ Reproducible generation
✓ Namespace-based
Use case: Deterministic IDs needed

Usage Tips

  • Prefer v4 version
  • Use no-hyphens format for database storage
  • v5 suitable for deterministic IDs
  • Batch generation improves efficiency
  • Validator checks format correctness

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