UUID Generator

Generate universally unique identifiers (UUIDs) instantly. Supports UUID v1 and v4 with bulk generation.

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Unique IDs

Generate cryptographically strong unique identifiers.

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Bulk Generation

Generate up to 100 UUIDs at once for your projects.

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100% Private

All UUID generation happens in your browser locally.

Understanding UUIDs

A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. UUIDs are standardized by the Open Software Foundation (OSF) and are documented in ISO/IEC 9834-8:2005 and RFC 4122.

UUID Versions

  • UUID v1: Generated using timestamp and MAC address. Contains temporal and spatial information.
  • UUID v4: Generated using random or pseudo-random numbers. Most commonly used version.

Common Use Cases

UUIDs are essential for database primary keys (ensuring uniqueness across distributed systems), session identifiers (tracking user sessions securely), file names (avoiding naming conflicts), message queue identifiers (tracking messages across systems), and distributed system coordination (maintaining consistency across nodes).

UUID Format

UUIDs are typically represented as 32 hexadecimal digits displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters. Example: 550e8400-e29b-41d4-a716-446655440000

Best Practices

  • Use UUID v4 for most applications due to better randomness
  • Store UUIDs in binary format in databases for efficiency
  • Use UUIDs for distributed systems to avoid ID conflicts
  • Consider UUID v1 if you need sortable or time-based IDs
  • Always validate UUID format before using in production

FAQ

What is a UUID?â–¼

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. It's virtually impossible for two randomly generated UUIDs to be the same.

What's the difference between UUID v1 and v4?â–¼

UUID v1 is generated using timestamp and MAC address, making it sortable but potentially exposing machine information. UUID v4 is purely random and most commonly used.

Are UUIDs truly unique?â–¼

While not mathematically guaranteed, the probability of generating duplicate UUIDs is extremely low (practically impossible in most real-world scenarios).

Can I use UUIDs as database primary keys?â–¼

Yes! UUIDs are excellent for primary keys in distributed databases as they ensure uniqueness across all systems without coordination.

How many UUIDs can I generate?â–¼

You can generate up to 100 UUIDs at once with our tool. For larger batches, simply generate multiple times.

Is UUID generation secure?â–¼

UUID v4 uses cryptographically strong random number generation in modern browsers, making them suitable for security-sensitive applications.