UUID Generator

Results
About UUIDs
  • UUID stands for Universally Unique Identifier.
  • Version 4 UUIDs are generated using random or pseudo-random numbers.
  • A standard UUID is 36 characters long, including hyphens, and contains 32 hexadecimal digits.
  • The probability of generating a duplicate UUID (a collision) is practically zero.

About UUID Generator

The UUID Generator creates Universally Unique Identifiers (UUIDs) — also known as GUIDs — that are used in software development to uniquely identify records, sessions, database entries, API keys, and more. Our generator produces Version 4 UUIDs, which are randomly generated and have an astronomically low probability of collision. Generate a single UUID or bulk-generate multiple UUIDs at once, with options for uppercase or lowercase format and with or without hyphens.

How to Use

Frequently Asked Questions

UUID stands for Universally Unique Identifier. It is a 128-bit label used in computing to identify information uniquely without requiring a central authority to assign IDs. A standard UUID looks like: 550e8400-e29b-41d4-a716-446655440000.

UUID v1 is generated based on the current timestamp and MAC address of the device. UUID v4 is fully randomly generated, which makes it more private and the most commonly used version.

Yes. UUID v4 identifiers are safe for use as primary keys in databases, API tokens, session IDs, and other unique identifier needs.

UUID v4 uses 122 bits of randomness. The probability of generating a duplicate is practically zero — around 1 in 5.3 × 10^36.

Yes, completely free with no registration required.

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