Dev
UUID Generator
Generate cryptographically secure UUIDs (v4). Create one or batch-generate up to 100 at once, with one-click copying.
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Click Generate to create UUIDs
Each UUID is a version 4 random UUID
Frequently asked questions
What is a UUID v4?
A universally unique identifier (UUID) version 4 is a 128-bit identifier formatted as 36 characters (32 hex digits + 4 hyphens). All bits except the version/variant bits are randomly generated, providing approximately 5.3×10^36 possible values.
Are these cryptographically secure?
Yes — we use crypto.randomUUID() which uses the browser's cryptographically secure random number generator. The same RNG used for encryption keys and security tokens.
Can UUIDs ever collide?
The probability of a collision with v4 UUIDs is extremely low — about 1 in 2.7×10^18 for 1 billion UUIDs. For all practical purposes, you can treat them as universally unique without coordination.
Generate UUID v4 (random) identifiers using your browser's built-in crypto.randomUUID() function. Generate one or batch-generate up to 100 at once.
Each UUID is unique, cryptographically secure, and follows the RFC 4122 version 4 format. Perfect for database primary keys, session identifiers, API resource IDs, or any situation requiring unique identifiers without a centralized coordinator.