UUID (Universally Unique Identifier) is a 128-bit identifier guaranteed to be unique. UUID v4 uses random numbers. Used in databases, APIs, and distributed systems.

NanoID is a compact, URL-friendly unique ID generator. It produces shorter IDs than UUID (21 chars by default) while maintaining collision resistance.

Is this generator free?

Yes, 100% free. Generate unlimited UUIDs — no signup needed.

Are the UUIDs truly random?

Yes. Uses crypto.randomUUID() which relies on cryptographically secure random number generation built into your browser.

✓ Crypto-secure✓ Bulk generate✓ Free forever

Free UUID Generator Online

Generate UUID v4, NanoID, and ULID. Bulk generate hundreds at once. Cryptographically secure.

Count:

Uppercase No dashes

How to use UUID Generator

Three steps. Instant results.

Step 1

Select UUID v4, NanoID, or ULID format.

Step 2

Set the count (1-500) and options like uppercase or no dashes.

Step 3

Click Generate and copy individual IDs or all at once.

How UUID Generator works

UUID v4 uses crypto.randomUUID() — the browser's built-in cryptographically secure random number generator. Each UUID is 128 bits represented as 32 hex digits in 8-4-4-4-12 format. NanoID generates compact 21-character URL-safe IDs using the same crypto API. ULID combines a millisecond timestamp with randomness, making it sortable by creation time. All generation happens in your browser — nothing is sent to any server.