Online UUID Generator

Online UUID Generator

Generate UUID/GUID Instantly in Your Browser

What is a UUID?

A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit identifier that is unique across both space and time. UUIDs are commonly used in software development, databases, and distributed systems to uniquely identify information without requiring a central authority.

UUID Format

UUIDs are typically displayed as 32 hexadecimal digits, displayed in five groups separated by hyphens: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx where M indicates the version and N indicates the variant.

UUID Versions Explained

Version 1 (Timestamp-based)

  • Based on the current timestamp and MAC address of the generating machine
  • Guarantees uniqueness across time and space
  • Can reveal information about when and where it was generated
  • Useful when you need to sort UUIDs chronologically

Version 4 (Random)

  • Generated using random or pseudo-random numbers
  • Most commonly used version due to its simplicity
  • Provides good uniqueness with very low collision probability
  • No information about generation time or location can be derived
  • Best choice for general-purpose unique identifiers

Version 5 (Name-based with SHA-1)

  • Generated by hashing a namespace identifier with a name
  • Deterministic - same name and namespace always produce the same UUID
  • Uses SHA-1 hashing algorithm
  • Useful when you need reproducible UUIDs based on input data
  • Standard namespaces: DNS (domain names), URL (web addresses), OID (object identifiers), X500 (distinguished names)

How to Use This Generator

  1. Select UUID Version: Choose between Version 1, 4, or 5 based on your needs
  2. Set Quantity: For versions 1 and 4, specify how many UUIDs to generate (1-1000)
  3. Configure Format:
    • Uppercase: Toggle to generate UUIDs in uppercase letters
    • Hyphens: Toggle to include/remove hyphens in the output
  4. For Version 5: Enter a name and select appropriate namespace
  5. Click Generate: Generate your UUIDs
  6. Copy or Save: Use the buttons to copy to clipboard or save as a text file

Common Use Cases

  • Database Primary Keys: Use Version 4 for unique record identifiers
  • API Keys: Version 4 provides secure, unpredictable identifiers
  • File Names: Version 4 ensures unique file names in distributed systems
  • Session IDs: Version 4 for web session management
  • Cache Keys: Version 5 for deterministic cache key generation
  • Configuration IDs: Version 5 when you need consistent IDs based on names

🔒 Privacy & Security

Complete Client-Side Processing: This UUID generator runs entirely in your browser. No data is transmitted to our servers or any external services. All UUID generation, processing, and file downloads happen locally on your device, ensuring complete privacy and security of your generated identifiers.