Developer & Cryptography

🆔 UUID / GUID Generator (v4)

Generate cryptographically secure RFC 4122 Version 4 UUIDs entirely inside your browser memory using the native Web Cryptography API. Bulk generate, format, and download.

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🔍 Live UUID Validator & Version Inspector

Frequently Asked Questions about UUID / GUID

Q: What is a Version 4 UUID and can it collide?

A Version 4 UUID consists of 122 random bits. The probability of generating a duplicate UUID v4 is approximately 1 in 2.71 × 10^18 (roughly equivalent to generating 1 billion UUIDs every second for 85 years), guaranteeing global uniqueness in software engineering.

Q: What is the difference between a UUID and a GUID?

GUID (Globally Unique Identifier) is Microsoft's term and implementation for the standard UUID (Universally Unique Identifier). In modern systems and RFC 4122 specifications, they are mathematically and structurally identical.