UUID Generator
Generate secure random UUID v4 identifiers instantly in your browser.
How to Use the UUID Generator
Generate one or more random UUIDs for use as identifiers in applications, databases, tests and sample data. UUIDs are useful when you need identifiers that can be created independently without a central counter.
Practical Example
A generated UUID such as 550e8400-e29b-41d4-a716-446655440000 follows the standard 36-character textual format with hexadecimal groups separated by hyphens.
Factors That Affect the Result
UUID version, randomness source, generation library and quantity requested affect the output. Random UUIDs should be generated with a reliable random source when uniqueness matters.
Frequently Asked Questions
What is a UUID?
A UUID is a 128-bit identifier commonly represented as a standardized hexadecimal string.
Are UUIDs guaranteed to be unique?
No system can guarantee absolute uniqueness, but properly generated UUIDs have an extremely low collision probability.
Can UUIDs be used as database keys?
Yes, although storage and indexing choices can affect database performance.
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What a UUID Is
A UUID is a 128-bit identifier commonly written as hexadecimal characters separated by hyphens, for example in an 8-4-4-4-12 pattern. UUIDs are widely used for database records, distributed systems, files, sessions, and application objects because they can be generated without relying on a single central counter.
Using Generated UUIDs
Different UUID versions encode or generate identifiers in different ways. Random UUIDs are useful when an application needs identifiers with an extremely low probability of collision. A UUID is an identifier, not a password, encryption key, or proof of authenticity, so do not treat its apparent randomness as a security control.
Store UUIDs in a format supported by your application and database, and keep capitalization or hyphen formatting consistent when systems compare them as strings. If interoperability matters, validate the expected UUID version and format before importing generated values.