UUID Validator
Validates a UUID's format and identifies its RFC 4122 version (v1-v8) and variant, flagging the special nil and max UUIDs.
| Formatted | 550e8400-e29b-41d4-a716-446655440000 |
| Version | Random (v4) |
| Variant | RFC 4122 (variant 1) |
UUID Validator — Free Online Tool
Validates a UUID's format and identifies its RFC 4122 version (v1-v8) and variant, flagging the special nil and max UUIDs.
How to use the UUID Validator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the UUID Validator free to use?
Yes. The UUID Validator is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the UUID Validator upload my data?
No. The UUID Validator processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the UUID Validator work offline?
After the page loads, the UUID Validator runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this UUID Validator
The UUID Validator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.