What does this UUID validator do?

It checks whether a string matches the canonical UUID format and reports whether it is valid. When valid, the tool also identifies the UUID version (1‑7) and can decode timestamps embedded in v6/v7 values.

How can I tell what version a UUID is?

The version is encoded in the 13th hexadecimal character of the UUID (the first nibble of the third group). For example, 'f47ac10b-58cc-0372-8567-0e02b2c3d479' is version 0 (invalid), while '...-7...' indicates version 7.

Does the validator work offline?

Yes. All processing occurs in your browser with no data sent to a server, so the tool works completely offline once loaded.

Why is version 7 timestamp decoding useful?

Versions 6 and 7 embed timestamps (100‑ns for v6, milliseconds for v7). This validator can extract and display the timestamp so you can verify when the UUID was created.

Free · Client-side · UUID Format Checker

UUID Validator

Validate UUID strings for correct format and version (1–7) right in your browser. Paste one or multiple values to check.

Part of WebEasier's UUID toolkit — the most complete UUID resource on the web.

UUID Validator

Unix ms timestamp + Random · crypto.getRandomValues()

All validation is performed in your browser; no data is transmitted or stored.

UUIDs

Validation results will appear here, showing version, variant, and timestamp (if any).
Paste one or more UUIDs and click Validate.

What does this validator do?

It checks whether strings conform to the canonical UUID format, identifies the version (1‑7), and decodes embedded timestamps for versions 6 and 7. Multiple UUIDs can be validated at once.

Supported Versions

1–7
All standard UUID versions are recognized.

Timestamp Decoding

Extracts time from v6/v7 identifiers when present.

Privacy

All processing happens in your browser; no data is sent to any server.

Bulk

Paste multiple UUIDs (one per line) for batch validation.

Validation

How UUID Validation Works

This tool checks strings against the standard UUID format (8-4-4-4-12 hex digits with hyphens). It ensures the version nibble (first character of the third group) is between 1 and 7, and the RFC 4122 variant bits are valid (8,9,a,b). Multiple UUIDs may be entered one per line.

When a UUID passes validation, the detected version is displayed. For versions 6 and 7 the embedded timestamp is decoded into a human-readable date.

Format Example

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

M = version (1‑7), N = variant (8‑b)

Tips

Practical Notes

Paste multiple UUIDs, one per line; blank lines are ignored.
Input is case-insensitive and extra whitespace is trimmed.
Version nibble outside 1‑7 flags the string as invalid.
All validation happens locally; no data is transmitted.

Ecosystem

Complete UUID Tools Directory

WebEasier hosts a full ecosystem of UUID-related developer tools.

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