Can I generate uppercase or no-hyphen formats?

Yes — both formatting switches are built in.

UUID v4 Generator

100% In-Browser

Generate cryptographically secure random UUIDs in bulk — one click or a thousand.

UUID v4 Generator (Cryptographically Secure)

Generated via native browser Web Crypto API. Zero collisions.

Quantity:

Uppercase (A-F)Include Hyphens

Zero Data Collection

Files are processed 100% locally

Instant Client-Side Speed

Zero network upload delays

Free & Unlimited

No registration or credit card needed

Cryptographically Secure UUID v4 Generator

Generate UUIDs using the browser's Web Crypto random source — the same quality of randomness as a hardware-backed generator. Generate one, or a thousand at once for fixture data, and copy the whole batch.

UUIDs are generated locally and never leave your device — appropriate even for keys you will use in production systems.

Frequently Asked Questions

Everything you need to know about using UUID v4 Generator safely and efficiently.

UUID v4 carries 122 bits of cryptographic randomness. The chance of a duplicate in any realistic usage is astronomically small (~1 in 10³⁶ for billions of IDs).

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