UUID Generator

Generate unique identifiers (UUIDs/GUIDs) in bulk

Options

Preview:6de3acf0-48f2-4f2c-8fd3-69e057b7de14

Quick Generate

Generated UUIDs

Configure options and click "Generate UUIDs"

Generate up to 100 unique identifiers at once

UUID Versions Comparison

Version 4 (Random)

  • - 122 random bits
  • - Cryptographically secure
  • - Most widely used
  • - No embedded information

Version 1 (Time-based)

  • - Contains timestamp
  • - Contains MAC address
  • - Sortable by time
  • - May leak system info

What is a UUID?

A UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier), is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and are designed to be unique across all devices and time without requiring a central registration authority. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

How to Use This Generator

  1. Select Version - Choose Version 4 (random) or Version 1 (time-based).
  2. Set Quantity - Select how many UUIDs to generate (1-100).
  3. Choose Format - Toggle hyphens and uppercase options as needed.
  4. Generate - Click the button to create your UUIDs.
  5. Copy or Download - Copy individual UUIDs, all at once, or download as a file.

UUID Versions Explained

Version 1

Generated using timestamp and MAC address. Useful when you need time-sortable IDs but may expose system information.

Version 4

Generated using random numbers. Most commonly used, provides no information about when or where it was created.

Common Use Cases

  • Database Primary Keys - Unique identifiers that don't reveal record count.
  • Session IDs - Secure, unpredictable session identifiers.
  • File Names - Unique names for uploaded files to prevent conflicts.
  • API Keys - Generate unique tokens for API authentication.
  • Distributed Systems - IDs that can be generated on any node without coordination.
  • Message Queues - Unique message identifiers for tracking.

FAQ

How unique are UUIDs really?

With 122 random bits, UUID v4 has 2^122 possible values. The probability of generating a duplicate is astronomically small - you'd need to generate 1 billion UUIDs per second for 86 years to have a 50% chance of one collision.

Which version should I use?

Use Version 4 for most cases - it's the standard choice. Use Version 1 only if you need time-sortable IDs and don't mind exposing timestamp/MAC information.

Are UUIDs secure for sensitive data?

UUID v4 uses cryptographically secure random numbers, making it suitable for security-sensitive applications. However, for tokens requiring high security, consider additional measures.