About the UUID Generator
Generate one or hundreds of RFC 4122 version-4 UUIDs using the browser's cryptographically secure random generator. Options for uppercase, no-hyphen output and bulk copy.
UUIDs are effectively collision-proof identifiers for databases, APIs and distributed systems — no central registry required.
How to use the UUID Generator
- Choose how many UUIDs you need.
- Toggle uppercase or hyphen-free formatting if needed.
- Click "Generate" and copy one or all.
Common uses
Database primary keys
API request and correlation IDs
Unique file and resource names
Frequently asked questions
Are these truly random?
Yes — generation uses crypto.getRandomValues(), the same secure source used for cryptography.
Can two UUIDs collide?
The probability is astronomically small: you would need to generate billions per second for decades to expect one collision.
What does the 4 mean in UUID v4?
It marks the version — v4 UUIDs are generated from random numbers rather than time or hardware addresses.
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