UUID Validator
Check whether a string is a valid UUID and show its version and variant, directly in your browser without any detours.
Your inputs are processed in your browser and are not transmitted to our servers. Note: third-party resources (e.g. advertising and analytics from Google/Cloudflare) and an optional PayPal donation link may transfer data when loading or when clicked. Browser extensions or plugins may be able to read content that is visible in the input fields.
The result will appear here …
How to use this tool (video)
This video is hosted on YouTube. When you play it, data may be sent to Google.
UUID Validator
A UUID is a standardized format used in many systems. However, not every string is a valid UUID. This tool checks whether a string is a valid UUID and directly shows its version and variant in your browser without any detours. Everything runs locally in your browser.
How it works
The validator checks the input against the UUID format per RFC 4122. A valid UUID has 32 hexadecimal characters in the form 8-4-4-4-12, separated by hyphens. The validator analyzes the 13th position to determine the version (1 through 5) and the 17th position for the variant. For a valid RFC 4122 UUID, the 17th position is one of the digits 8, 9, a, or b. Results are displayed immediately.
What the tool can and cannot do
The tool can only validate UUIDs in standard format. It does not accept UUIDs without hyphens or in alternative formats. It cannot distinguish between genuine UUIDs and strings that happen to match the pattern if the underlying pattern is coincidentally correct. It does not validate UUIDs against a database or server. It does not support UUID versions outside the standard.
Why local browser processing
Local browser processing means your data never reaches a server. No uploads, no server logs, no third-party access. You need no account. After the page loads, the tool works offline too. There is no server that could be attacked and your data stays on your device. This is especially important with sensitive data like payroll lists or customer information.
Frequently asked questions
What does a UUID validator do?
It checks whether a string conforms to the UUID format per RFC 4122 and shows the version number and variant.
Muss ich dafür online sein?
No, after the page loads the tool works offline. Resources are cached in the browser.
Werden meine Daten hochgeladen?
No, your inputs are never sent to a server. Everything is processed locally in your browser.
Can the tool validate UUIDs without hyphens?
No, it accepts only the standard format with hyphens.
Which UUID versions are supported?
The validator recognizes versions 1 through 5, as defined in the RFC 4122 standard.
Can the tool generate a UUID?
No, the tool only validates. There is a separate tool for generating UUIDs.