UUID Generator
Free online UUID generator: batch-create random v4 or time-ordered v7 UUIDs, uppercase or no-dash, crypto-secure.
Privacy: all processing happens locally in your browser. Your input never leaves your device.
What is UUID Generator?
A UUID is a 128-bit globally unique identifier: v4 is fully random, while v7 embeds a timestamp and is sortable — ideal as a database primary key that avoids index fragmentation. This tool generates UUIDs in batches (1-100 at a time) from the crypto.getRandomValues cryptographically secure source, with uppercase and no-hyphen formatting options and one-click copy.
How to Use
- Choose the version (v4 random / v7 time-ordered) and quantity
- Set formatting options
- Generate and copy
FAQ
- Should I choose UUID v4 or v7?
- Choose v4 for general use; choose v7 as a database primary key when insert performance matters (time-ordered and B+tree friendly).
- Can UUIDs collide?
- The collision probability of v4 is about 1 in 2^122 — treat them as unique in any real system.
- Is the randomness here secure?
- Yes — it uses the browser's crypto.getRandomValues cryptographically secure source, not Math.random.
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Last updated 2026-09-04