Free UUID Generator — Generate Random UUID v4 & GUIDs
Generate cryptographically secure random UUID v4 and GUID strings in bulk.
Generator Options
100% Cryptographically Secure Client-Side Web Crypto API (`crypto.randomUUID()`)
What is a UUID / GUID Generator?
In modern database design, distributed microservices, and software engineering, primary keys require global uniqueness without relying on centralized auto-increment sequence counters. A UUID generator (or GUID generator) produces 128-bit identifiers formatted as 36-character hexadecimal strings designed to guarantee near-zero collision probability across distributed systems.
Understanding UUID Version 4 Standard
According to RFC 4122 specifications, UUID Version 4 uses pseudo-random or cryptographically strong random numbers to fill 122 of its 128 bits. The canonical format consists of five groups of hexadecimal digits separated by hyphens in 8-4-4-4-12 form:
- Version Bit (4): The 13th character indicates the UUID version (always `4` for random UUIDs).
- Variant Bit (8, 9, a, or b): The 17th character designates the RFC 4122 variant.
- Distributed Database Utility: Perfect for PostgreSQL `uuid_generate_v4()`, MongoDB IDs, session tokens, and transaction tracing.
Frequently Asked Questions — UUID Generator
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