Paste a UUID value and check whether it is structurally valid. The result includes version and normalized output.
Identifier validator
Enter a value or load the sample to see the result.
Guide
Validate UUID values online, detect the version, and copy a normalized lowercase UUID for APIs, databases, and logs.
UUID values are used as identifiers in APIs, databases, logs, queues, configuration files, and distributed systems. A valid UUID follows a specific hexadecimal structure with version and variant bits. This validator checks that structure and returns a normalized value.
The page accepts common UUID and GUID-style inputs, including hyphenated, compact, and wrapped forms when the characters and version pattern are valid. The normalized result is lowercase and hyphenated, which makes it easier to compare across systems.
UUID validation is useful when a value has been copied from a log line, spreadsheet, URL, support ticket, or database export. One missing character or invalid separator can break an API call or query. This tool gives a direct answer and a clean value to copy.
The validator checks format only. It does not confirm whether the UUID exists in your database, belongs to a real object, or has permission in a system.
Quick reference
550e8400-e29b-41d4-a716-446655440000
Valid UUID / Version: 4 / Normalized: 550e8400-e29b-41d4-a716-446655440000
Validation confirms structure, version, and variant patterns. It does not prove that an object exists in a database.
Lowercase hyphenated output makes values easier to compare across logs, APIs, spreadsheets, and tickets.
Most failures come from missing characters, hidden whitespace, invalid hex letters, or mixed-up separators.
Common mistakes
Versions 1 through 8 are accepted when the value follows the expected version and variant structure.
Yes. Common GUID-style forms are accepted and normalized like UUIDs.
No. It only means the value is structurally valid.
Yes, as long as it has 32 valid hexadecimal characters and the correct version and variant pattern.