UUID Generator

Generate and validate UUIDs (v4 and v7) for your applications

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v4 UUIDs are fully random - suitable for most use cases where uniqueness matters.

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What is UUID Generator?

Free online UUID generator to generate cryptographically random UUID v4 (Universally Unique Identifier) strings for use in databases, APIs, and applications.

Generate up to 50 UUIDs at once, with options for uppercase formatting and removing dashes. UUIDs are 128-bit identifiers that are practically guaranteed to be unique across all systems, making them ideal for primary keys, session tokens, and distributed systems. No signup required.

How to Use UUID Generator

1Set how many UUIDs you want to generate (1 to 50)
2Choose options: uppercase formatting and/or remove dashes
3Click 'Generate' to create your UUIDs
4Click 'Copy' next to any UUID to copy it, or 'Copy All' for the entire list

Frequently Asked Questions

A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across all devices and time. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where 4 indicates version 4 (random). UUIDs are used as database primary keys, API identifiers, session tokens, and more.

UUID and GUID (Globally Unique Identifier) are essentially the same thing. UUID is the standard term used in most programming contexts (RFC 4122), while GUID is the term used primarily by Microsoft. Both refer to the same 128-bit identifier format.

Theoretically yes, but the probability is astronomically low. With UUID v4, you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a collision. For practical purposes, UUID v4 values are considered universally unique.

UUIDs work well as primary keys in distributed systems where you need to generate IDs without a central authority. The trade-off is that they use more storage (16 bytes vs 4-8 bytes for integers) and can be slower for indexed lookups. Many modern databases handle UUIDs efficiently.

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