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Free UUID Generator Online – v4, v1, v7 GUID Generator with Bulk Export | TrenTyx

trentyx@local:~/dev-utilities/uuid-generator $ run uuid-generator_

Cryptographically secure UUID generation (v4, v7, v1, NIL). 100% browser-based, uses Web Crypto API, no data sent to server.

UUID v4 (Random)
generating...
Letter Case
Hyphens
Braces Format
bulk-generator.uuid Ready to generate

What is a UUID / GUID Generator?

A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems without requiring a central registration authority. UUID v4 uses cryptographically secure random numbers, making collision probability practically zero. UUID v7 includes a millisecond Unix timestamp prefix, enabling time-ordered primary keys ideal for database performance. This tool operates 100% locally in your browser using the Web Crypto API, guaranteeing complete privacy and zero server latency.

Common Use Cases

  • Database primary keys — use UUID v7 for time-ordered, index-friendly primary keys instead of auto-increment integers.
  • Distributed systems — generate unique IDs across multiple servers without a central coordinator or collision risk.
  • Bulk test data generation — export up to 10,000 UUIDs at once for seeding databases or writing test fixtures.
  • API request/session IDs — create unique identifiers for tracing requests, sessions, or idempotency keys.

Frequently Asked Questions

What's the difference between UUID v4 and v7?

UUID v4 is fully random, offering no inherent ordering. UUID v7 embeds a millisecond-precision timestamp at the start, so IDs generated later naturally sort after earlier ones — improving database index performance for primary keys.

Can two generated UUIDs ever collide?

The probability is astronomically small. UUID v4 has 122 random bits, meaning you'd need to generate roughly 2.7 quintillion UUIDs to have a 50% chance of a single collision.

Is a UUID the same as a GUID?

Yes, functionally. UUID is the standard term (defined in RFC 9562), while GUID is Microsoft's name for the same 128-bit identifier format.

Can I generate UUIDs without hyphens or in uppercase?

Yes. This tool supports custom formatting options including uppercase, no hyphens, and wrapping in braces, plus bulk export to text or CSV.

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