UUID Generator

How to Use Click 'Generate' for an instant UUID v4. Set the count to generate multiple UUIDs at once. Choose between uppercase or lowercase output and whether to include hyphens. Copy individual UUIDs or the entire list at once. Who Is This For Developers using UUIDs as database primary keys, engineers creating request IDs or session tokens manually, and QA testers who need unique test record identifiers. Key Features • UUID v4 (random) instant generation • Bulk UUID generation • Hyphen inclusion/removal toggle • Uppercase/lowercase toggle • Copy entire list Frequently Asked Questions Q: What is the difference between UUID v4 and v1? A: UUID v1 includes a timestamp and MAC address, encoding the creation order. UUID v4 is purely random, offering better privacy. Q: Can two generated UUIDs ever be the same? A: Theoretically possible but vanishingly rare — the probability is approximately 1 in 10^18 per pair. Practically impossible. Q: Is the 32-character version without hyphens still a valid UUID? A: Yes, removing hyphens is purely cosmetic. Both forms represent the same value and are widely accepted. Tips In PostgreSQL, use gen_random_uuid() to generate UUIDs server-side. When implementing optimistic UI updates on the client, pre-generate a UUID here to assign the new record's ID before the server response arrives.