Are these UUIDs truly unique?

UUID v4 uses cryptographic randomness. The probability of collision is astronomically low — you'd need to generate 2.71 quintillion UUIDs to have a 50% chance of one duplicate.

Which UUID version should I use?

UUID v4 (random) is the most common choice. Use v7 or ULID if you need sortable IDs. Use v5 if you need deterministic IDs from a namespace.

UUID Generator

Generate random UUIDs (v4) and other UUID versions. Get single or bulk UUIDs with formatting options.

Options

How many? (max 50)

Format

About UUID Generator

Generate UUID v4 identifiers using the Web Crypto API. Ideal for database keys, request IDs, and client-side entity IDs with extremely low collision risk.

How to use

Choose how many UUIDs you need (up to 50).
Pick a format (hyphens, no hyphens, or uppercase).
Generate and copy the list.

Frequently Asked Questions about UUID Generator

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