UUID Generator
Generate UUIDs, ULIDs, NanoIDs, and secure tokens instantly. Perfect for database IDs, session tokens, and unique identifiers.
UUID v4
Random 128-bit UUID. Most widely supported identifier format.
ULID
Universally Unique Lexicographically Sortable Identifier. Time-sortable.
NanoID
URL-friendly unique ID. Smaller than UUID but equally unique.
Secure Token
Cryptographically secure 256-bit token for API keys and sessions.
Which One Should I Use?
UUID v4 (Most Common)
Works everywhere. Good for distributed systems where multiple servers generate IDs independently. Not sortable by time.
ULID (Sortable)
Combines timestamp + random. IDs created later sort after earlier ones. Great for databases with time-based queries.
Frequently Asked Questions
What's the difference between UUID v4 and v1?
v4 is completely random (most common), v1 includes timestamp + MAC address (less private, but sortable). Use v4 for general purposes - it's the standard.
CanNano ID be used instead of UUID?
Yes! NanoID is shorter (21 chars vs 36) and URL-safe. Use for API keys, short URLs, or anywhere space matters. It's equally unique.
Why use ULID instead of UUID?
ULID sorts by creation time - perfect for databases. UUID v4 is random so newer IDs don't sort after older ones. ULID combines both: unique + time-sortable.
Are there collision risks?
Extremely unlikely - UUID v4 has 122 bits of randomness (1 in 2^122 chance). For context, you have a better chance of being struck by lightning twice!