UUID v4 & Random Integer Generator

Generate secure identifiers locally in your browser, then copy them with one click.

Generated UUID v4Generating…

UUID v4 and Random ID Generator

This UUID generator creates random version 4 UUIDs and fixed-length random integer IDs. Generation happens entirely in your browser through the Web Crypto API, so identifiers are not sent to an application server.

How to Generate an ID

  1. Select UUID v4 or Random Integer.
  2. For an integer ID, choose an exact length from 1 to 15 digits.
  3. Select Generate New whenever you need another value.
  4. Select Copy to place the current identifier on your clipboard.

Integer IDs never begin with zero. An 8-digit selection therefore produces a value from 10,000,000 through 99,999,999.

What Is a UUID v4?

A UUID is a 128-bit identifier commonly used for database records, API resources, test data, distributed systems, and file names. Version 4 UUIDs get their identifying bits from random data and use the familiar lowercase, hyphenated form:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The 4 marks the UUID version, while y contains the standard UUID variant bits. The enormous number of possible values makes accidental collisions extremely unlikely in ordinary applications.

UUID vs. GUID

GUID is a term popularized by Microsoft for globally unique identifiers. In most modern development contexts, GUID and UUID refer to the same 128-bit identifier format. This tool uses the standards-based name UUID v4 and does not provide a separate GUID mode.

Random Integer IDs and Collisions

Digit length controls the available number of IDs. Longer values provide a larger range and reduce the chance that independently generated values repeat. Randomness alone does not guarantee uniqueness, so applications that require a strict uniqueness constraint should enforce it in their database or storage layer.

These generated values are useful for test fixtures, temporary references, sample data, and systems that already check for duplicates. They should not replace purpose-built secrets, passwords, session tokens, or authentication credentials.

Private, Browser-Based Generation

Both modes use cryptographically strong randomness supplied by your browser. Nothing is uploaded for generation, and no generated value is stored by this tool.

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