What UUID versions exist?

Common versions are v1 (timestamp+MAC), v3 (MD5 namespace), v4 (random), v5 (SHA-1 namespace), and v7 (timestamp+random). v4 is the most widely used.

Is UUID validation case-sensitive?

No. UUIDs are hexadecimal and case-insensitive per RFC 4122. Both uppercase and lowercase are valid.

A NIL UUID is all zeros (00000000-0000-0000-0000-000000000000) and represents the absence of a UUID value.

UUID Validator

ID Tools

Paste any UUID to validate its format and detect the version (1-5, 7, or NIL). Shows detailed breakdown of the UUID structure including variant and version bits.

100% client-side processing

Paste UUID

How to Use UUID Validator Online

Paste your data into the input field above
The result appears instantly in the output area
Click "Copy" to copy the result to your clipboard

Validate UUID format and detect version. Runs 100% client-side — no data is sent to any server.

Frequently Asked Questions

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