UUID Generator: Create Unique IDs Instantly

Do you need unique identifiers for your databases or applications without risking collisions? Our online UUID generator allows you to create UUID v4, v7, ULID, NanoID, or secure tokens instantly with a single click. Completely free and 100% client-side, our tool ensures total privacy with no data transfer to any server. Developers, take advantage of a fast and reliable solution to validate and inspect your identifiers while maintaining the integrity of your systems.

Identifier type

Output format

Quantity

UUID

One per line Number lines

Space = regenerate

History

No identifiers generated yet.

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What is a UUID and what is it used for?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122, represented as 32 grouped hexadecimal characters (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). The probability of collision is statistically negligible: for UUID v4, you would need to generate 2.71 quintillion UUIDs to have a 50% chance of a collision.

UUID v4 vs UUID v7

UUID v4 is entirely random (CSPRNG) — ideal for web resource identifiers where order doesn't matter. UUID v7 is the new version (RFC 9562, 2024): the first 48 bits encode the Unix timestamp in milliseconds, making UUIDs naturally sortable. It's the recommended choice for database primary keys (better B-tree indexing performance).

ULID and NanoID: modern alternatives

ULID (Universally Unique Lexicographically Sortable Identifier) encodes a timestamp in 48 bits + 80 random bits in 26 Crockford Base32 characters — lexicographically sorted, URL-safe. NanoID is a compact alternative to UUIDs: 21 characters by default, customizable alphabet, 5× faster than UUID v4 and ideal for short URLs.

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Online UUID generator: random UUID v4 and ULID