🧑‍💻 Developer

UUID Generator

Generate random version-4 UUIDs (GUIDs) in bulk.

Results

UUIDs

📊 UUID Generator chart

Character composition of the result: letters, digits, spaces, punctuation and other symbols.

What is the UUID Generator?

Generate random version-4 UUIDs (GUIDs) in bulk. Version-4 UUIDs are random 128-bit identifiers that are practically unique, so different systems can create IDs without coordinating.

UUID Generator – free online developer tool illustration
UUID Generator — free, exact and private.

How to use the UUID Generator

  1. Enter your how many.
  2. Tick the options you need: uppercase.
  3. Press the Generate button — press it again for a fresh result.
  4. Read the output: uuids.
  5. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

RFC 4122 version 4: 122 random bits, version and variant bits set

Where the UUID Generator helps in real life

A developer seeds a test database and needs 100 unique IDs. Generating them in bulk saves writing a script.

A product manager needs unique reference IDs for a spreadsheet of support cases that will later be imported into a database.

Common mistakes to avoid

  • Treating UUIDs as secret or unguessable security tokens.
  • Removing hyphens when the receiving system expects them.
  • Using UUIDs as sort order, since v4 values are random.
  • Mixing uppercase and lowercase inconsistently.

💡 Practical tip: The chance of two random v4 UUIDs colliding is so small it can be ignored for practical purposes.

Illustration: a developer workspace with two monitors showing code and a chart
UUID Generator in everyday work — illustration.

Tips for better results

  • Keep the standard hyphenated format unless told otherwise.
  • Store UUIDs in a native UUID column type where available.
  • Use a timestamp column for ordering.

Frequently asked questions

What does the UUID Generator do?

Generate random version-4 UUIDs (GUIDs) in bulk.

How is it calculated?

The UUID Generator uses this method: RFC 4122 version 4: 122 random bits, version and variant bits set.

Is the UUID Generator accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the UUID Generator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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