Uuid Generator - Free Online Tool

Validate & Decode UUID

Check UUID format, extract version, verify variant, and validate any UUID

📌 Try these examples:

Generate New UUIDs

Create cryptographically secure RFC 4122 compliant UUIDs

Your UUID

Number of UUIDs to Generate

Format

Frequently Asked Questions

How do I validate a UUID?

Paste any UUID into our validator tool above and click 'Validate UUID'. It will check the format, extract the version (1-5), verify the variant, and confirm if it's a valid RFC 4122 compliant UUID. Valid UUIDs follow the pattern 8-4-4-4-12 hexadecimal digits.

What is the difference between UUID versions?

UUID v1 uses timestamp + MAC address (predictable). UUID v3/v5 use MD5/SHA-1 hashing (deterministic). UUID v4 uses random numbers (most common, unpredictable). UUID v7 combines timestamp with randomness (sortable + unique). Version 4 is recommended for most use cases.

Can I use UUIDs as database primary keys?

Yes! UUIDs are excellent for database primary keys in distributed systems. Store as BINARY(16) in MySQL or UUID type in PostgreSQL for optimal performance. Benefits include no coordination needed, offline generation, and better security than sequential IDs.

Are UUIDs truly unique?

Yes, for all practical purposes. UUID v4 has a collision probability of 1 in 2^122 (5.3 undecillion). You could generate a billion UUIDs per second for 100 years with less than 50% chance of a single collision. Major companies generate trillions daily without issues.

How do I decode a UUID to check its version?

Use our UUID decoder above. The version is encoded in the 13th character (after removing hyphens). Version 4 UUIDs have '4' at position 14. The decoder extracts version, variant, and validates the format automatically.