Free UUID Validator that works offline
Check UUID formatting before importing identifiers, debugging APIs or validating fixtures. Multiple values can be tested together, and valid results include the encoded version number.
What this uuid validator does
A UUID is more than 32 hexadecimal digits: canonical grouping, version bits and variant bits define the standard format. The all-zero nil UUID is recognized separately because it has a special meaning rather than an ordinary version.
How to use the UUID Validator
- Enter or paste one canonical hyphenated UUID per line into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Validate UUIDs and review a valid or invalid report with version details before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Checking API identifiers
- Validating database export columns
- Identifying a UUID version
- Testing generated fixtures in bulk
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- Validation confirms format, not whether an identifier exists.
- Dash-free UUIDs are intentionally not treated as canonical.
- Use the UUID generator to create new random version 4 values.
Frequently asked questions
Does this tool upload my data?
No. UUID Validator processes its input in the current browser and does not submit it to a conversion API.
What input does the UUID Validator accept?
Canonical 8-4-4-4-12 hexadecimal UUID strings are recognized, with optional surrounding braces. The RFC variant and versions 1 through 8 are checked.
Can I use this tool offline?
Yes. Once the Offline Tools PWA has cached the page, the core feature works without an internet connection.