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UUID v7 Generator

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Generate time-ordered, sortable UUID v7 values instantly in your browser.

One UUID per line, sorted by creation time — ideal for database keys and seed data.

What is UUID v7?

UUID v7 is a time-ordered identifier defined in RFC 9562. Its first 48 bits encode the creation time as a UNIX timestamp in milliseconds, and the rest is random, so values stay globally unique while sorting naturally by creation time.

Time-ordered UUIDs are friendlier to database indexes than fully random UUID v4: new rows land near each other instead of fragmenting the index. This tool generates UUID v7 locally in your browser and can extract the timestamp back out of any v7 value.

How to use the UUID v7 Generator

  1. Click “Generate” to create a single UUID v7.
  2. Use “Copy” to copy it to the clipboard.
  3. Click “Generate 10” for a batch list, one UUID per line.
  4. Paste any UUID v7 into the extraction field to reveal its embedded creation timestamp.

Best practices

  • Prefer UUID v7 over v4 for database primary keys — index locality is significantly better.
  • The embedded timestamp reveals when a record was created. Avoid v7 where that is sensitive information.
  • Values generated within the same millisecond are not guaranteed to be strictly ordered.
  • UUIDs are identifiers, not secrets — never use them as tokens or passwords.

Related guides

Learn the workflow behind this tool and what to check next.

Identifiers and databases

UUID v4 vs v7 for application identifiers

A practical identifier decision that separates uniqueness from secrecy and avoids database or compatibility surprises.

Read guide

UUID v7 checks before switching your identifiers

UUID v7 keeps global uniqueness while sorting by creation time, but adoption still deserves a quick review of storage, privacy, and ordering expectations.

Confirm library support

Check that your language, framework, and database drivers can generate and parse UUID v7 before standardizing on it.

Mind the embedded timestamp

The first 48 bits encode creation time in milliseconds. Do not use v7 where exposing creation time is a privacy concern.

Do not rely on strict ordering

Values created in the same millisecond are not guaranteed to be monotonic across processes unless your generator adds counters.

Keep v4 where randomness matters

For tokens or identifiers that must not leak timing information, random UUID v4 remains the safer choice.

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UUID v7 FAQ

What is the difference between UUID v4 and UUID v7?
UUID v4 is fully random. UUID v7 starts with a 48-bit millisecond timestamp followed by random bits, so values sort by creation time while staying unique.
Can I get the creation time back from a UUID v7?
Yes. The first 12 hex characters encode the UNIX timestamp in milliseconds. This tool decodes it for you.
Is UUID v7 safe to use as a database primary key?
Yes — it is one of its main use cases. Sequential-ish values keep B-tree indexes compact compared to random UUID v4.
Is anything sent to a server?
No. Generation and decoding run entirely in your browser.