Free Online UUID/GUID Generator
Generate UUIDs/GUIDs online. Supports UUID v1 (time-based), v4 (random), and v5 (name-based). Free, fast, and secure UUID generator with bulk generation and copy to clipboard.
Generate 1-100 UUIDs at once
About UUIDs
UUID v1: Time-based UUIDs that include a timestamp and the MAC address of the computer generating the UUID. Useful when you need to know when the UUID was created.
UUID v4: Randomly generated UUIDs. This is the most commonly used version and provides good uniqueness with minimal information leakage.
UUID v5: Name-based UUIDs using SHA-1 hashing. Given the same namespace and name, you'll always get the same UUID. Useful for deterministic UUID generation.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across both space and time, making them ideal for database keys, session identifiers, and more.
What's the difference between UUID v1, v4, and v5?
UUID v1 is time-based and includes a timestamp and MAC address. UUID v4 is randomly generated and is the most commonly used version. UUID v5 is name-based using SHA-1 hashing, meaning the same input always produces the same UUID.
Is it safe to use UUID v4 for security purposes?
UUID v4 uses cryptographically strong random numbers and is suitable for most security purposes. However, for critical security applications like authentication tokens, consider using additional security measures alongside UUIDs.
Can I generate multiple UUIDs at once?
Yes! Our UUID generator supports bulk generation of up to 100 UUIDs at once. Simply adjust the count field and click generate. You can copy individual UUIDs or all of them at once.
Are the generated UUIDs truly unique?
UUID v4 generates random UUIDs with an extremely low probability of collision (approximately 1 in 5.3×10³⁶). While not mathematically guaranteed to be unique, the probability of generating a duplicate is negligible for practical purposes.