UUID Validator
Check whether a string is a properly formatted UUID and, when it is, read back its version and variant. It verifies the 8-4-4-4-12 hex structure and the RFC 4122 bits entirely in your browser.
- 100% free
- Private & safe
- Runs in your browser
Read our complete guide: UUID v4 vs UUID v7: Key Differences and When to Use Which
Why use UUID Validator?
UUID Validator is a quick, no-nonsense developer utility that runs entirely client-side, so your code and data never leave your machine.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Format: 8-4-4-4-12 hexadecimal, RFC 4122 versions 1–8
- Paste a UUID.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
How to use UUID Validator
- Paste a UUID.
- The tool checks its format instantly.
- See whether it is valid, plus its version and variant.
- Use it to verify IDs before storing or comparing them.
Examples
- Confirming a v4 UUID is well-formed.
- Checking the version of an unknown identifier.
Supported formats & limits
- Format: 8-4-4-4-12 hexadecimal, RFC 4122 versions 1–8
Limitations
- Validates format and version/variant bits, not whether the UUID is unique or real.
- Non-standard GUID braces are not accepted.
Frequently asked questions
What does it report?
Whether the string is a valid UUID, and if so its version (1–8) and variant.
Does it check uniqueness?
No — it validates format only; uniqueness depends on how it was generated.
Is anything uploaded?
No — validation is local.
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