What does this UUID format checker do?

It verifies that each input string follows the canonical UUID structure (8‑4‑4‑4‑12 hex digits). The tool flags improperly formatted values and ignores version decoding.

How can I tell what version a UUID is?

The version appears in the 13th hexadecimal character (first nibble of the third group), but this checker ignores it and focuses solely on formatting.

Does the checker work offline?

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

Does this tool show creation time?

No. The checker validates formatting only; it does not extract or display embedded timestamps.

Free · Client-side · UUID Format Checker

UUID Format Checker

Ensure strings follow the canonical UUID pattern (8‑4‑4‑4‑12 hex digits). Paste one or many values to verify formatting.

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

UUID Format Checker

Check canonical uuid pattern

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

UUIDs

Format check results (including any reasons for invalid entries) will appear here.
Paste one or more UUIDs and click Check Format.

What does this format checker do?

It verifies that each input string follows the canonical UUID format (8‑4‑4‑4‑12 hex digits). Improperly formatted values are flagged, and you may check multiple UUIDs at once.

Applicable Versions

Any version number is accepted as long as the format matches the canonical pattern.

Timestamp Decoding

This checker does not decode embedded timestamps; it only validates formatting.

Privacy

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

Bulk

Paste multiple UUIDs (one per line) for batch format checks.

Format Info

How UUID Format Checking Works

This tool checks strings against the standard UUID format (8-4-4-4-12 hex digits with hyphens). It verifies the grouping, hexadecimal characters, and RFC 4122 variant bits (8‑b). Multiple UUIDs may be entered one per line.

After a format check, results simply state whether each string matches the UUID pattern. No version detection or timestamp decoding is performed.

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.
The format check regards only character groups and variant bits; any version nibble is accepted.
All checks happen locally; no data is transmitted.

Ecosystem

Complete UUID Tools Directory

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

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