UUID Validator
Free UUID and GUID validator: check valid UUIDs in RFC 4122 format, version/variant nibbles, bulk validate up to 10,000 IDs locally. No upload, no account.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
What is checked
Checks canonical 8-4-4-4-12 hex form and version/variant nibble ranges. Does not call a registry.
Developer Quick Tips
- Paste one UUID per line to bulk-validate up to 10,000 IDs in a single run.
- Valid UUIDs must match 8-4-4-4-12 hyphenated hex format with version digit 1-8 and variant digit 8, 9, a, or b (RFC 4122).
- UUID v4 validation checks the version nibble (3rd group, 1st hex digit) is 4 and variant nibble (4th group, 1st hex digit) is 8, 9, a, or b.
- Each line is reported as valid or invalid with the original value preserved for easy copy-back.
- Inspect tokens and hashes locally, never paste production secrets into untrusted sites.
Frequently asked questions
What exactly does UUID Validator check?
UUID Validator checks that each input matches the canonical 8-4-4-4-12 hyphenated hex format (e.g., 550e8400-e29b-41d4-a716-446655440000). It also verifies the version nibble (3rd group, 1st hex digit) is 1-8 and the variant nibble (4th group, 1st hex digit) is 8, 9, a, or b, per RFC 4122. It does not call a registry or verify uniqueness.
How do I check if a UUID is valid?
Paste the UUID into the validator and press Ctrl or Cmd + Enter. The tool checks format, version, and variant nibbles instantly. Valid UUIDs show a pass result; invalid ones show the reason (format mismatch, wrong version or variant digit).
What is the difference between UUID and GUID?
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are the same concept. GUID is the term used in Microsoft ecosystems (.NET, SQL Server), while UUID is the standard term in RFC 4122. This validator checks both using the same RFC 4122 rules.
Can I validate multiple UUIDs at once?
Yes. Paste one UUID per line to bulk-validate up to 10,000 values in a single run. Each line is reported as valid or invalid, preserving the original value for easy copy-back to your spreadsheet or log.
Does UUID Validator upload my data?
No. UUID Validator runs locally in your browser. Your input is not uploaded to our servers for processing.
Is UUID Validator free?
Yes. UUID Validator is free to use with no account required. Processing stays on your device.
What formats does UUID Validator accept?
UUID Validator accepts only the canonical 8-4-4-4-12 hyphenated hex format (e.g., 550e8400-e29b-41d4-a716-446655440000). It does not accept brace form {...}, urn:uuid: prefixes, or hyphen-free 32-hex strings. For UUID generation, use uuid-generator.
Related tools
- UUID Generator: Generate random UUID v4 online in your browser. Bulk generate 1 to 10,000 UUIDs instantly with no upload, no account, no server processing.