UUID Generator

Generate random version-4 UUIDs (universally unique identifiers) — one or in bulk. Uses your browser's cryptographically secure randomness, so they're suitable for real keys and IDs. Copy with one click; nothing is sent anywhere.

How many Uppercase No hyphens Wrap in

About UUIDs

v4 UUIDs are random 128-bit identifiers — the collision chance is so small it's negligible for everyday use.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (the 4 marks the version).
Great for database keys, request/trace IDs, file names, idempotency keys, and test data.

Generated locally with crypto.randomUUID() (with a secure fallback) — never sent to a server.

More dev tools: JSON formatter, Base64 encoder, and password generator.