Paste a string to check if it is a valid UUID (v4 or v1). The tool shows format, version, and variant. Useful for API validation and debugging. Runs in your browser.
Valid UUID
About UUID Validator
A UUID is a 128-bit identifier in the form 8-4-4-4-12 hexadecimal digits (with hyphens). This tool checks whether a string matches that format and reports the version (e.g. v4 for random, v1 for time-based) and variant. Handy for validating API inputs and documentation.
How to use
- Paste or type a UUID string.
- Click Validate. The result shows whether it is valid and its version/variant.
Frequently Asked Questions
What UUID versions are supported?
The tool validates the format (8-4-4-4-12 hex) and reports the version nibble (e.g. 4 for UUID v4, 1 for v1). Variant is also checked.
Is my UUID sent to a server?
No. Validation runs entirely in your browser.
Are hyphens required?
Yes. Standard UUID format uses hyphens (e.g. 550e8400-e29b-41d4-a716-446655440000). Lowercase and uppercase hex are both accepted.