UUID Generator
Generate cryptographically secure UUID v4 identifiers instantly.
Generated UUID
v4— Bulk Generate
About UUID v4
- Format
- 8-4-4-4-12 hexadecimal characters separated by hyphens, e.g.
550e8400-e29b-41d4-a716-446655440000 - Randomness
- UUID v4 uses 122 bits of randomness from
crypto.randomUUID(). The chance of collision is negligible. - Privacy
- All generation happens in your browser. Nothing is sent to a server.
Frequently Asked Questions
- What is the difference between UUID v1 and v4?
- UUID v1 is based on the current timestamp and MAC address, which can leak information. UUID v4 is purely random and is preferred when privacy matters.
- Can I use these UUIDs in a database?
- Yes. UUID v4 is widely used as a primary key in databases. Most databases (PostgreSQL, MySQL, MongoDB) have native UUID types.
- Is this UUID generator cryptographically secure?
- Yes. This tool uses the browser's built-in
crypto.randomUUID()API which is cryptographically secure.