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UUIDs

💡 Why Use UUIDs?

📖 UUID Versions Explained

UUID v4 (Most Common)

Random 128-bit number. Used for most applications. Example: 550e8400-e29b-41d4-a716-446655440000

UUID v1 (Timestamp-based)

Contains timestamp and MAC address. Sortable by creation time. Example: 6ba7b810-9dad-11d1-80b4-00c04fd430c8

UUID v7 (New Standard)

Timestamp-based like v1 but with random bits. Sortable and URL-safe. Recommended for new projects.

Frequently Asked Questions

What is a UUID?
UUID stands for Universally Unique Identifier. It's a 128-bit number represented as a 36-character string.
Which UUID version should I use?
Use UUID v4 for general purposes. Use UUID v7 for database primary keys. Avoid UUID v1 due to privacy concerns.
Can UUIDs collide?
The probability is extremely low. About 1 billion UUIDs per second for 100 years to have 50% collision chance.
Are UUIDs secure?
UUID v4 is cryptographically random, but don't use it as security tokens.
How many UUIDs can I generate?
As many as you need! Batch generation supports up to 100 at once.