UUID Generator (v4 & v7)

Developer utilities · Done in 3 steps

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About

Generate random v4 or time-ordered v7 UUIDs, up to 1,000 at once, in upper case, without hyphens or with braces, and inspect any UUID.

How to use it

You give: A version, a count and formatting options
You get: One or more UUIDs, plus version/timestamp details for any pasted UUID
Good to know: Uses the browser's cryptographic random generator. v7 IDs embed the current time from your device clock, which reveals roughly when they were created.
Privacy: Processed on your device. Nothing is uploaded, stored or logged.
Last tested: 2026-10-28

FAQ

Should I use UUID v4 or v7?

v4 for general unique IDs. v7 for database primary keys: they sort by creation time, so indexes stay compact and inserts are faster.

Can two generated UUIDs collide?

Practically never. v4 has 122 random bits — you'd need to create billions per second for decades to expect a duplicate.

Is a GUID the same as a UUID?

Yes. GUID is Microsoft's name for the same 128-bit format; use the {braces} and uppercase options to match Windows-style GUIDs.

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