UUID Generator
Generate random UUIDs (v4) for use as unique identifiers.
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FAQ
- What is a UUID?
- A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. Version 4 UUIDs are randomly generated, with a collision probability so low it is practically zero.
- Is UUID v4 truly unique?
- UUID v4 uses 122 random bits, giving 5.3 × 10^36 possible values. The probability of generating two identical UUIDs is astronomically small — about 1 in 2^61 after generating 1 billion UUIDs per second for 85 years.
- Are these UUIDs cryptographically secure?
- Yes. This tool uses crypto.randomUUID() which relies on the Web Crypto API for cryptographic-quality randomness.
Generate cryptographically random UUID v4 identifiers using the Web Crypto API. UUIDs are 128-bit identifiers formatted as 32 hexadecimal digits in 5 groups (8-4-4-4-12). Commonly used as database primary keys, session tokens, correlation IDs, and unique references in distributed systems.