🆔 UUID v4 Generator — Free, Instant
Generate cryptographically strong UUID v4 (random) values. Enter quantity (1–100) and click Process. Uses browser's crypto.randomUUID() — cryptographically secure. No server, no signup.
Frequently Asked Questions — UUID Generator
What is a UUID and how is it structured?+
A UUID (Universally Unique Identifier) is a 128-bit number formatted as 8-4-4-4-12 hexadecimal characters separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The "4" in the third group indicates UUID v4 (random). UUID v4 has 122 bits of randomness — the probability of generating two identical UUIDs is astronomically low.
Is UUID v4 truly unique?+
Yes. UUID v4 uses crypto.randomUUID() which is cryptographically secure. The chance of collision (two identical UUIDs) is 1 in 5.3×10³⁶ — effectively impossible. You'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of even one collision.
What is the difference between UUID and GUID?+
GUID (Globally Unique Identifier) is Microsoft's name for UUID. They are functionally identical. GUIDs generated by Windows use UUID v4 format. This tool generates RFC 4122 compliant UUID v4 values which are compatible with both.