🔑 UUID Generator

Generate cryptographically random UUID v4 identifiers for use in development.

Format

Generated UUID

—

Bulk Generate

UUIDs

About This Tool

UUID Generator

Generate unique UUIDs (v1, v4) for use as database IDs, session tokens, or unique identifiers in any application.

Why Use This Tool?

  • Generate unique IDs for database records, users, or transactions
  • Create unique session tokens or API keys for testing
  • Use as unique identifiers in distributed systems where sequential IDs won't work
  • Generate bulk UUIDs for data seeding or testing scenarios
  • Used by software developers and database architects daily

Overview

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. The probability of generating a duplicate UUID is so astronomically low that they are considered practically unique — even when generated independently on different machines simultaneously. UUIDs are the standard solution for generating database primary keys, session tokens, API keys, file names, and identifiers in distributed systems where a sequential or centralised ID generator would create bottlenecks or conflicts. Our UUID Generator creates Version 4 UUIDs (random) and Version 1 UUIDs (time-based) instantly using your browser's cryptographically secure random number generator. Generate one at a time or generate dozens in bulk for data seeding, test fixtures, or configuration files. All UUIDs are generated locally in your browser — no server roundtrip, no rate limiting.

How to Use

  • 1

    Choose UUID Version

    Select Version 4 (random — most common) or Version 1 (time-based, encodes timestamp and MAC address).

  • 2

    Set Quantity

    Enter how many UUIDs you need — from 1 to 100 at a time.

  • 3

    Choose Format

    Select standard format (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx), uppercase, or without hyphens depending on your system's requirement.

  • 4

    Generate

    Click Generate. Your UUIDs appear instantly in the output area.

  • 5

    Copy or Download

    Click Copy All to clipboard or Download as a .txt file for use in your code, scripts, or database.

Frequently Asked Questions

UUID v1 is based on the current timestamp and machine MAC address. UUID v4 is completely random. v4 is preferred for most uses as it does not expose timing or machine information.
Practically yes. The probability of a UUID v4 collision is 1 in 2^122 — about 5.3 × 10^36 — making it effectively impossible to generate duplicates in real-world scenarios.
Yes, and it is widely done. UUID PKs allow distributed ID generation without a central counter. The downside is larger index size (16 bytes vs 4 bytes for INT). Use sequential UUID variants (v7) for better index performance.
Both are equivalent. The UUID spec is case-insensitive. Many systems use lowercase by convention. Check your specific database or API requirements.
The nil UUID is all zeroes: 00000000-0000-0000-0000-000000000000. It is used as a null/empty UUID value in some applications, similar to how NULL is used in databases.