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Generate RFC 4122 Compliant UUIDs (v4) and Validate Existing UUIDs
A comprehensive tool for generating and validating Universally Unique Identifiers (UUIDs). Generate single or bulk UUIDs using the industry-standard v4 format, and validate existing UUIDs for RFC 4122 compliance.
The UUID Generator & Validator tool provides three main functionalities: generating single UUIDs, generating bulk UUIDs, and validating existing UUIDs. All generated UUIDs comply with RFC 4122 and use version 4 (random generation).
Tip: The tool generates UUID v4 using cryptographically secure random numbers, ensuring an extremely low probability of collision.
The single UUID generator creates one RFC 4122 compliant UUID v4 with a single click. Each generated UUID is guaranteed to be unique across space and time.
550e8400-e29b-41d4-a716-446655440000Note: Each UUID v4 has 122 bits of randomness, providing 2^122 possible unique identifiers—enough to generate billions of UUIDs every second for billions of years without collision.
The bulk UUID generator allows you to generate up to 1000 UUIDs at once, perfect for seeding databases, testing, or batch processing scenarios.
1 - 1000 UUIDsOne UUID per linePerformance: Generating 1000 UUIDs takes only milliseconds. The limit of 1000 ensures optimal browser performance while still being useful for most testing and development scenarios.
The UUID validator checks if a given string is a valid UUID according to RFC 4122. It validates the format and reports the UUID version for valid inputs.
550e8400-e29b-41d4-a716-446655440000Invalid Examples: These would fail validation:
not-a-uuid550e8400e29b41d4a71644665544000012345The validator detects and reports the UUID version. Version information is encoded in the UUID itself at a specific position (character 14).
Generated using timestamp and MAC address. Guaranteed unique but reveals generation time and machine info.
Reserved for DCE (Distributed Computing Environment) security implementations.
Generated using MD5 hash of namespace and name. Same inputs always produce the same UUID.
Generated using random numbers. This tool generates v4 UUIDs by default, providing the best balance of uniqueness and privacy.
Generated using SHA-1 hash of namespace and name. More secure than v3 but still deterministic.
UUID Structure: The version is indicated by the character at position 14 (the first character after the second hyphen). For v4 UUIDs, this is always 4 (in hexadecimal).
Once you have generated or validated UUIDs, several options are available for working with the output.
Copies the generated UUID(s) to your clipboard with one click.
Downloads the UUID(s) as a .txt file with an appropriate filename.
Resets the current section to start fresh with new UUIDs.
Generate unique identifiers for database records, ensuring no collisions across distributed systems.
Create unique IDs for API resources, webhooks, or any system that requires guaranteed unique identifiers.
Generate test data with unique identifiers for unit tests, integration tests, or seeding test databases.
Generate new UUIDs when migrating data from systems that used auto-increment IDs to distributed systems.
Validate incoming UUIDs from external systems to ensure they follow the correct format before processing.
Assign unique IDs across multiple microservices without requiring a central ID generation service.
Understanding the technical specifications of UUID v4 helps in making informed decisions about when and how to use them.
| Total Bits | 128 bits |
| Version Bits | 4 bits |
| Variant Bits | 2 bits |
| Random Bits | 122 bits |
| String Length | 36 characters |
With 122 random bits, the probability of generating two identical UUIDs is astronomically low:
That is approximately 1 in 5.3 x 1036
RFC 4122: This tool generates UUIDs that comply with RFC 4122, the official specification for UUIDs. This ensures compatibility with all standard UUID implementations across different platforms and programming languages.