UUID Generator
Generate cryptographically random UUID v4 values — one at a time or in bulk.
Results are for general guidance only — not professional advice. Learn more.
How to use this tool
Select how many UUIDs you need from the dropdown (1, 5, 10, 25, or 50) and click Generate. All UUIDs are generated using crypto.randomUUID() where available, with a manual v4 fallback for older browsers.
Use the Copy all button to copy the entire list to your clipboard in one click.
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Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. It is typically represented as 32 hexadecimal characters in the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUIDs are used as database primary keys, session tokens, and identifiers in distributed systems.
What is UUID v4?
UUID version 4 is generated using random or pseudo-random numbers. It is the most commonly used UUID version because it requires no coordination between systems. The version (4) and variant bits are fixed; all other bits are random.
Are UUIDs truly unique?
UUIDs are not mathematically guaranteed to be unique, but the probability of collision is so small it is effectively negligible. With UUID v4, you would need to generate approximately 2.7 quintillion UUIDs before having a 50% chance of a single collision.
What is the difference between UUID and ULID?
A ULID (Universally Unique Lexicographically Sortable Identifier) encodes a timestamp in the first 10 characters, making ULIDs sortable by creation time. This is useful for database indexing as ULIDs avoid the index fragmentation that random UUID v4 values can cause. UUIDs are more widely supported across tools and databases.