UUID Generator
Generate random UUID v4 identifiers. Create one or many and copy with a click.
f1087c77-d8de-4ade-9efa-b61b39fa1a1d6e98e20f-3b4b-4409-830e-4ba78f71e92b99985f7e-4313-4b86-8db7-e93797d2092dad27d708-2e25-40dc-9f34-a95654c644126474290b-963d-4305-b8ad-58290a9a66f9
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information without a central authority. It is written as 32 hexadecimal digits in five groups separated by hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000.
What is UUID v4?
Version 4 UUIDs are generated from random numbers. With 122 random bits, the chance of a collision is astronomically small, which makes them ideal as database primary keys, request IDs, and distributed identifiers. This tool uses your browser's cryptographically secure random generator (crypto.randomUUID) when available.
Common uses
- Primary keys in databases (especially distributed systems).
- Idempotency keys and request/trace IDs.
- File names and object keys that must not collide.
- Session and token identifiers.
Are these UUIDs unique?
UUID v4 relies on randomness, so duplicates are theoretically possible but practically negligible. For the vast majority of applications they can be treated as unique.
Is my data safe?
UUIDs are generated locally in your browser — nothing is sent to a server.
Frequently asked questions
What is a UUID v4?
A UUID v4 is a 128-bit identifier generated from random numbers, written as 32 hexadecimal digits in five hyphen-separated groups. Its 122 random bits make collisions practically impossible.
Are these UUIDs safe to use as database keys?
Yes — UUID v4 is widely used for primary keys, request IDs, and distributed identifiers. This tool uses your browser's cryptographically secure generator when available.
Is it free and private?
Yes — UUIDs are generated locally in your browser, so nothing is sent to a server.