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UUID & ULID Generator Online

Free tool for generating and validating UUID v4, v7 and ULID

uuid-generator
Output

Click Generate to create identifiers

Ctrl+Enter

V4
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v4

UUID v4

Random UUIDs using cryptographic generator

v7

UUID v7

Sortable UUIDs with embedded timestamp

ID

ULID

Compact sortable Crockford Base32 identifiers

✓

Validate

Verify and parse UUID and ULID

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Frequently Asked Questions

UUID (Universally Unique Identifier) is a 128-bit identifier guaranteed to be unique without a central coordinator. It is used as a primary key in databases, session identifier, resource ID in APIs, and in distributed systems.
UUID v4 is fully random with all 122 bits generated by a cryptographic generator. UUID v7 embeds a timestamp in the first 48 bits, providing chronological sortability and better B-tree index performance in databases.
UUID is preferable in distributed systems, during database replication, and when identifiers are created on the client before writing to the database. Auto-increment is simpler and more compact for monolithic applications with a single database.
Theoretically a collision is possible, but the probability is extremely low. For UUID v4, you would need to generate about 2.71 quintillion identifiers to reach a 50% chance of a duplicate. In practice, this is considered impossible.