Private generators

UUID Generator

Create RFC-compatible UUID version 4 or version 7 identifiers in secure batches without sending them to a server.

Web Crypto generator

Generate unique identifiers

Local & private
UUID version

Output

Ready when you are

Your generated UUIDs will appear here.

Choose your options, then generate UUIDs.

How to use it

Get a reliable result

  1. Choose random UUID v4 or time-ordered UUID v7.
  2. Enter a batch size from 1 to 100 and choose lowercase, uppercase, canonical, or compact formatting.
  3. Generate the identifiers, then copy one, copy the complete list, or download a text file.

Useful for

Common workflows

  • Seed database records and test fixtures
  • Create request, event, or object identifiers
  • Generate sortable identifiers for newly timestamped records

Examples

What to expect

Canonical UUID v4
Input
Version 4, lowercase, with hyphens
Output
f47ac10b-58cc-4372-a567-0e02b2c3d479

Each generated value is different; this is an example of the expected shape.

Compact UUID v7
Input
Version 7, uppercase, no hyphens
Output
0195D5F8A2617A36B04B8FE4303B42CD

Removing hyphens is convenient for some systems but is not canonical UUID text.

Know before you start

Important limitations

  • UUID v7 values generated within the same millisecond are not guaranteed to sort in generation order.
  • Removing hyphens creates 32 hexadecimal characters rather than the canonical UUID text representation.
  • Uniqueness is probabilistic, not a mathematical guarantee, even though collisions are extraordinarily unlikely with secure randomness.
  • UUIDs are identifiers, not secrets, passwords, or authorization tokens.

Keep exploring

More private generators

Password GeneratorCreate long, cryptographically random passwords privately in your browser.Open Password Generator →QR Code GeneratorCreate private QR codes with custom colors and an optional center logo.Open QR Code Generator →JWT Decoder & InspectorDecode colored JWT header and payload JSON and inspect standard claims.Open JWT Decoder & Inspector →

Common questions

UUID Generator FAQ

What is the difference between UUID v4 and v7?

UUID v4 uses random bits throughout most of the identifier. UUID v7 places a Unix timestamp in the leading bits and adds randomness, making values broadly sortable by creation time.

Are these UUIDs generated securely?

Yes. The tool uses the browser Web Crypto random-number generator and sets the required version and variant bits.

Are generated UUIDs uploaded or stored?

No. Generation, formatting, copying, and text-file creation happen locally in the current browser tab.

Does UUID v7 guarantee strict ordering?

No. Values created in different milliseconds sort chronologically, but multiple values created within the same millisecond contain random trailing bits and are not made strictly monotonic by this tool.

Browser-local

Processed on your device

UUID generation uses Web Crypto in this browser. Generated identifiers are never uploaded or stored.

How this processing works

The tool reads and processes this input in your browser. Tool Packer's application server does not receive the input or generated result.

Read the full privacy explanation