UUID Generator vs NanoID Generator
UUID v4 and NanoID are both widely-used unique identifier generators, but they differ in format, length, and collision probability.
UUID Generator
UUID generator — create UUID v4 (cryptographically random) or UUID v7 (time-ordered, RFC 9562) identifiers instantly. Bulk-generate up to 100 UUIDs at once and download as a text file. UUID v7 is ideal for database primary keys — it is lexicographically sortable and avoids index fragmentation.
- ✓RFC 4122 standard format
- ✓36 characters including hyphens
- ✓122 bits of randomness
- ✓Universally supported across all systems
- ✓Human-readable hyphenated format
NanoID Generator
NanoID generator — create secure, compact, URL-safe unique IDs using crypto.getRandomValues. Default 21-character IDs have the same collision probability as UUID v4 but are shorter. Configurable alphabet and length.
- ✓Compact alphanumeric format (customizable)
- ✓21 characters by default
- ✓~126 bits of randomness at default length
- ✓URL-safe alphabet by default
- ✓Smaller than UUID — better for URLs and DBs
When to use each
You need a universally recognized standard format, database compatibility, or interoperability with external systems.
You need short IDs for URLs, database keys, or anywhere where character count matters and you control both ends.