UUID Validator
Paste one or more strings and check whether they're valid UUIDs, detecting the version (v1-v8) and variant. Includes the version without hyphens.
UUIDs to validate
Result (0/0 valid)
How to use: Validate UUID
- 1Paste one or more UUIDs, one per line.
- 2See which ones are valid and their version.
- 3Pick the output format and copy the normalized UUIDs.
What is it for?
- Check suspicious IDs in logs or imports.
- Normalize UUIDs to uppercase or without dashes.
- Check which UUID version a system generates.
Validating UUIDs and recognizing their version
Canonical format
A valid UUID has 32 hexadecimal digits in 8-4-4-4-12 groups. The first digit of the third group indicates the version (1, 4, 7…) and the first digit of the fourth group the variant.
Accepted variants
They appear in uppercase, without hyphens, wrapped in braces or with the urn:uuid: prefix. The tool normalizes them to the canonical lowercase format.
Nil and max UUID
00000000-0000-0000-0000-000000000000 is the nil UUID and ffffffff-ffff-ffff-ffff-ffffffffffff the max. They are formally valid but usually signal an uninitialized value.
Related tools
Frequently asked questions
What formats does it accept?+
Canonical UUID (8-4-4-4-12), lowercase/uppercase, with or without hyphens, and URN format (urn:uuid:...).