UUID Generator and Validator
Generate random UUID version 4 identifiers and validate UUID format, version, and variant.
Generator settings
Output format
Generated UUIDs
Generate unique identifiers
Cryptographically random UUID version 4 values will appear here.
UUID validator
Enter a UUID to inspect its validity, version, and variant.
Unique identifiers
Generate identifiers without a central authority
UUIDs provide globally unique identifiers for databases, APIs, distributed systems, request tracking, and client-side applications without requiring a centralized sequence generator.
Random UUID version 4
UUID version 4 uses cryptographically secure random values together with fixed version and variant bits, making collisions extremely unlikely in practical applications.
UUIDs are identifiers, not secrets
Although UUIDs are difficult to guess, they should never be treated as passwords, API keys, authorization tokens, or other confidential credentials.
Guide
About UUID Generator and Validator
UUIDs are decentralized identifiers commonly used for database rows, API resources, requests, and distributed systems.
This tool generates random version 4 UUIDs and validates UUID syntax, version, and variant.
UUIDs are identifiers, not passwords or authorization controls.
UUID version 4
Version 4 UUIDs use random bits together with fixed version and variant fields.
Bulk generation
Generate multiple independent identifiers for fixtures, imports, test data, or application resources.
Validation details
A validator can check syntax, version, and variant but cannot determine whether an identifier exists in another system.
Security limitations
Do not use UUID secrecy as an access-control mechanism, even when values are difficult to guess.
FAQ
Frequently asked questions
What is a UUID?
A UUID is a 128-bit identifier represented in a standardized text format.
What is UUID v4?
Version 4 is generated primarily from random bits.
Are UUIDs guaranteed unique?
Absolute uniqueness is not guaranteed, but collisions are extremely unlikely with proper random generation.
Is a UUID the same as a GUID?
The terms are often used interchangeably, especially in Microsoft ecosystems.
Can a UUID be a password?
No. UUIDs are identifiers and should not replace secrets.
Are UUIDs generated locally?
Yes, generation is intended to occur in your browser.
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