Generate random UUID v4 identifiers, one at a time or in bulk.
About this tool
Generates random UUID v4 identifiers using your browser's cryptographically secure random number generator (crypto.randomUUID), one at a time or in bulk — suitable for database primary keys, request IDs, or any context needing a collision-resistant unique identifier.
Frequently asked questions
How likely is a UUID v4 collision?
Astronomically unlikely — there are 2^122 possible v4 UUIDs. You'd need to generate billions of them per second for billions of years before a collision became statistically likely.
Are these UUIDs suitable for security tokens?
UUID v4 uses a secure random source, so it's unpredictable, but UUIDs weren't specifically designed as security tokens — for session tokens or API keys, a purpose-built random token generator is the more conventional choice.