A UUID (Universally Unique Identifier) is a 128-bit identifier guaranteed to be unique across time and space. RFC 4122 defines standard UUID formats.

UUID v4 is the most common UUID variant, generated from random numbers. It provides 122 bits of randomness and is suitable for most applications.

Can I use UUIDs in my database?

Yes! UUIDs are commonly used as primary keys in databases. They are better than sequential IDs for distributed systems where servers need independent ID generation.

How do I use this with ChatGPT or Claude?

Ask AI: "Generate a UUID for my test data" or share this URL. AI models can generate or explain UUID usage.

Are UUIDs truly unique?

Yes. UUID v4 has 122 bits of randomness, making collisions astronomically unlikely (1 in 5.3 x 10^36). Even generating 1 billion UUIDs per second, collision probability is near zero.

Can I use UUIDs in URLs?

Yes, UUIDs work great in URLs and are URL-safe. They are commonly used for resource identifiers, session tokens, and unique links.

UUID

UUID Generator

Revision: April 15, 2026 • Generate browser-based UUID v4 values

Create UUIDs quickly

Generate RFC-compliant UUID version 4 values for identifiers, test data, or temporary tokens. The tool uses browser crypto randomness for secure UUID creation.

Generate UUIDs

Number of IDs

Output

🔒 Why This Tool Works in Your Browser

UUID generation creates universally unique identifiers using algorithms that don't require external services or data transmission. Cloud-based generators create records of every UUID you request, potentially revealing how many database records you're creating, transaction volumes, or system scaling patterns. Browser-based generation keeps UUID creation completely private. This matters for developers managing systems, architects designing scalable applications, and teams whose UUID generation patterns might reveal infrastructure details. Local generation means creating unlimited UUIDs instantly on your device without external logging or surveillance. You can generate batch UUIDs for database population, create system identifiers, and design identifiers confidentially without revealing your scaling patterns to service providers. Cloud generators would log your UUID request frequency and volume, potentially exposing your database sizes, transaction patterns, or infrastructure scaling to external parties. Local generation eliminates this exposure. Your UUID generation never leaves your device, your system scaling patterns remain private, and your identifier creation stays confidential. This is particularly important for security researchers, competitive developers, companies protecting infrastructure details, and system architects designing proprietary databases. Browser-based UUID generation enables trustworthy identifier creation while protecting your system infrastructure details and preventing external inference of your application's scale or architectural patterns.