Developer

UUID Validator

Validate whether a string looks like a UUID and identify the version when possible.

Last reviewed: April 30, 2026Free toolMethodology

UUID Validator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Result

Calculating the sample result.

Why it matters

UUIDs appear in APIs, database records, and support tickets, and a fast validator helps spot malformed identifiers immediately.

When to use

  • Checking API IDs and request logs
  • Validating user-provided identifiers
  • Confirming whether a UUID is version 4, version 1, or another supported format

Inputs & Outputs

Inputs

  • Input text should be the candidate UUID string.

Outputs

  • Validation output states whether the string matches the expected UUID structure.
  • Version detection identifies the UUID version when the input is valid.

UUID validation method

The tool checks the string structure against a UUID pattern and reads the version nibble from the canonical UUID layout.

UUID validation checks format only, not origin or database existence

Worked example

1

API debug

A support engineer wants to verify whether `550e8400-e29b-41d4-a716-446655440000` is a valid UUID.

Inputs

  • Candidate UUID: 550e8400-e29b-41d4-a716-446655440000

Steps

  • Validate the canonical pattern
  • Read the version digit from the third segment

Result

  • The tool confirms that the value is a valid UUID and labels it as version 4.

Edge cases & caveats

  • A structurally valid UUID may still be invalid in your application context.
  • Non-canonical UUID encodings are not the focus of this tool.

Frequently Asked Questions

Does validation mean the record exists?

No. It only means the string matches UUID structure. It does not check any database or external system.

Can this tell if a UUID is version 4?

Yes. The validator reads the version nibble and reports the detected version when the input is valid.

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