UUID Generator
Generate version 4 UUIDs instantly in your browser. Bulk generate up to 100 at once and copy to clipboard. Uses crypto.randomUUID(). Nothing is uploaded.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters. Version 4 UUIDs are randomly generated and the probability of collision is astronomically low.
Is crypto.randomUUID() safe to use?
Yes — it uses the OS cryptographically secure random number generator, the same source used for encryption keys. It is available in all modern browsers and Node.js 15+.
What is the difference between UUID v4 and v7?
UUIDv4 is fully random. UUIDv7 is time-ordered (timestamp in the high bits) which makes it better for database primary keys because it generates in monotonically increasing order, reducing index fragmentation. This tool generates v4.
Is my data private?
Yes — completely. Everything runs locally in your browser. Nothing is sent to any server, and nothing is retained after you close the tab.
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