How it works
Check the 8-4-4-4-12 hexadecimal layout, version nibble and variant bits. Recognize nil and max UUIDs separately.
Input definitions
- UUID
- Plain text; maximum 200,000 characters.
A worked example
- UUID
- 550e8400-e29b-41d4-a716-446655440000
Assumptions & limits
Canonical hyphenated UUIDs only; versions 1–8 with RFC variant, plus nil/max. No database lookup or collision test.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Does a valid UUID format prove uniqueness?
No. The checker inspects layout, version and variant bits. It cannot know how a UUID was generated, whether it is authentic, or whether another system has used the same value.
Does this tool execute the code or data I paste?
Inputs are treated as data under the stated parser or transformation. Output is displayed as text. Parsing or formatting does not establish that the content is safe to execute elsewhere.
How does the UUID format and version checker tool work?
Check the 8-4-4-4-12 hexadecimal layout, version nibble and variant bits. Recognize nil and max UUIDs separately.
What are the assumptions and limits of UUID format and version checker?
Canonical hyphenated UUIDs only; versions 1–8 with RFC variant, plus nil/max. No database lookup or collision test.