UUID Generator
Generate cryptographically random UUID v4s or timestamp-based UUID v1s. Generate in bulk, copy individually, or export all. Validate an existing UUID.
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Frequently Asked Questions
Quick answers to common questions
What is a UUID?+
UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. Written as 32 hexadecimal digits in 5 groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What is the difference between UUID v1 and v4?+
UUID v1 is generated using the current timestamp and the machine's MAC address — so it encodes when and where it was created. UUID v4 is completely random (122 random bits). For most use cases, v4 is preferred as it contains no system information.
Are UUIDs truly unique?+
UUID v4 has 2^122 possible values. The probability of generating a duplicate is astronomically low (~1 in 5 undecillion). For all practical purposes, they are unique. Collisions are theoretically possible but negligible.
What is the difference between UUID and GUID?+
They are the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUIDs. Both follow the same RFC 4122 standard.