UUID v1/v4 · ULID · Nanoid · Bulk generation · API keys

Generate Unique IDs That Are Truly Collision-Proof

Not all ID generators are created equal. Random integers collide. Sequential integers leak data. UUIDs, ULIDs, and Nanoids are designed for distributed systems where uniqueness is non-negotiable.

Open ID Generator →
✓ Cryptographically secure ✓ Bulk generation up to 1000 ✓ Multiple formats

Which ID Format Should You Use?

UUID v4 — Truly random

Statistically guaranteed uniqueness across distributed systems. The default choice for database primary keys and resource identifiers.

ULID — Sortable + unique

Lexicographically sortable and unique. Embeds a timestamp prefix so records sort by creation time. Database-friendly.

Nanoid — Short + safe

Compact, URL-safe identifiers. Shorter than UUIDs with configurable alphabet. Perfect for user-facing IDs in URLs.

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