Learn How UUIDs Are Structured

See the version, variant, and time fields that make up a UUID.

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UUID or ULID

💡 Versions 1, 6, and 7 (and ULIDs) embed a creation time, which is decoded above. Versions 4 are fully random and carry no timestamp. Everything is parsed in your browser.

learning tips

🎓

Try the built-in examples to see how each UUID version differs in structure.

🧩

The breakdown shows which bits carry the version, variant, timestamp, and node.

📚

A practical way to understand RFC 4122 / RFC 9562 without reading the spec.

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No data is uploaded — experiment freely.

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The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

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Also check out…

🏷️

Check a UUID Version

Find out whether a UUID is v1, v4, v7, or another

🕒

Extract the Timestamp from a UUIDv7

Decode the creation time embedded in a sortable UU

🆔

Decode a ULID

Read the timestamp and randomness from a ULID.

🐞

Debug IDs in Logs and Databases

Quickly understand an unfamiliar identifier you fo

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