Should I use v4 or v7?

v7 for database primary keys (sortable, indexes well). v4 for session tokens or anywhere unpredictability matters.

Are these cryptographically secure?

Yes — we use the browser's Web Crypto API for randomness.

UUID Generator

Generate UUIDs in bulk — v4 (random) or v7 (time-ordered). Optional uppercase and braces.

Version Count Uppercase braces

UUIDs

How to use UUID Generator

Pick a version and count.
Click Generate.
Copy the list.

What is UUID Generator?

UUIDs are 128-bit identifiers that are practically unique without coordination. Version 4 is purely random — best for unguessable IDs. Version 7 embeds a timestamp at the start, so generated UUIDs sort chronologically (great for database primary keys).

FAQ

Should I use v4 or v7?: v7 for database primary keys (sortable, indexes well). v4 for session tokens or anywhere unpredictability matters.
Are these cryptographically secure?: Yes — we use the browser's Web Crypto API for randomness.

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