About this tool
Universally Unique Identifiers (UUID) are standard 128-bit numbers used to map distributed system elements securely without relying on a centralized registry or database locking node.
Entropy Probability Boundaries
Our UUID Generator sets up standardized Version 4 variants built entirely around random parameters. The structure leverages cryptographically strong entropy pools to generate characters, separating structural positions with hyphen parameters:
With over 5 undecillion possible variants, the mathematical probability of two duplicate IDs colliding inside an information database is effectively zero, providing absolute identifier certainty.
Frequently asked questions
Everything you need to know about UUID / GUID Generator.
What is the difference between UUID v1, v4, and v7?
UUID v1 is time-based and includes the MAC address of the generating machine — creating privacy concerns and sequential patterns. UUID v4 is entirely random (122 bits of entropy) — the most widely used version for application IDs. UUID v7 is a newer time-ordered random UUID that combines a millisecond timestamp prefix for database index efficiency with random bits for uniqueness.
How unique are UUID v4 values — can they collide?
The probability of a v4 collision is astronomically small. With 2¹²² possible values (~5.3 × 10³⁶), you would need to generate approximately 1 billion UUIDs per second for 85 years before having a 50% chance of a single collision. In practice, collisions are not a concern.
Can I generate UUIDs in bulk?
Yes. Set the quantity field to generate up to 1,000 UUIDs in a single click. All generated IDs can be copied as a newline-separated list, ready to paste into a seed file, spreadsheet, or database.
What format are the generated UUIDs in?
UUIDs are generated in the canonical RFC 4122 format: 8-4-4-4-12 hexadecimal characters separated by hyphens (e.g. 550e8400-e29b-41d4-a716-446655440000). Upper and lowercase variants are both available.
Are the generated UUIDs cryptographically random?
Yes. The tool uses crypto.randomUUID() or the Web Crypto API (crypto.getRandomValues()) — the same cryptographic random source your browser uses for HTTPS — not the weaker Math.random().