UUID Generator Misc tools

// Generate UUID v4 in JavaScript
function uuidv4() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

console.log(uuidv4());

import uuid

# Generate UUID v4
print(uuid.uuid4())

# Generate UUID v5 with namespace
namespace_uuid = uuid.NAMESPACE_DNS
name = 'example.com'
print(uuid.uuid5(namespace_uuid, name))

<?php
// Generate UUID v4
function guidv4() {
    $data = random_bytes(16);
    $data[6] = chr(ord($data[6]) & 0x0f | 0x40);
    $data[8] = chr(ord($data[8]) & 0x3f | 0x80);
    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}

echo guidv4();
?>

# Generate single UUID
curl https://www.uuidgenerator.net/api/version4

# Generate multiple UUIDs
curl https://www.uuidgenerator.net/api/version4/5

Professional UUID Generator Tool

Our UUID Generator creates universally unique identifiers (UUIDs) for various applications and development needs. Whether you're building databases, developing APIs, or need unique identifiers for any purpose, our tool generates cryptographically secure UUIDs that meet industry standards.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Also known as GUIDs (Globally Unique Identifiers) in Microsoft systems, UUIDs are standardized by RFC 4122 and provide a way to generate unique identifiers without a central authority or coordination between parties.

UUID Versions Explained

Key Features of Our UUID Generator

• Multiple UUID Versions: Support for v1, v3, v4, v5, and nil UUIDs
• Bulk Generation: Create up to 1000 UUIDs at once
• Format Options: Standard, uppercase, no-hyphens, braces, URN, and base64
• Namespace Support: DNS, URL, OID, X.500, and custom namespaces for v3/v5
• Instant Generation: Client-side generation for speed and privacy
• Export Options: Download generated UUIDs as text file
• No Registration: Generate unlimited UUIDs without signing up

Common UUID Use Cases

UUID Format and Structure

A standard UUID is displayed as 32 hexadecimal digits in the format:

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

• 8-4-4-4-12: Groups of 8, 4, 4, 4, and 12 hexadecimal digits
• M: UUID version (1-5)
• N: Variant bits (8, 9, A, or B for RFC 4122 UUIDs)
• 128 bits total: Providing 2^128 possible UUIDs

Choosing the Right UUID Version

UUID Security Considerations

• Unpredictability: Version 4 UUIDs use cryptographically secure random numbers
• No Sequential Pattern: Unlike auto-increment IDs, UUIDs don't reveal quantity or order
• Privacy: Version 1 exposes MAC address and timestamp - use v4 for privacy
• Collision Probability: Extremely low - generating 1 billion UUIDs per second for 100 years yields 50% collision chance
• URL Safety: Standard UUID format is URL-safe without encoding

UUID vs Other Identifier Systems

Implementation Examples

UUIDs are supported across all major programming languages and databases:

• JavaScript: crypto.randomUUID() or uuid library
• Python: uuid module in standard library
• Java: java.util.UUID class
• SQL: UUID data type in PostgreSQL, MySQL 8.0+
• C#: System.Guid structure
• Go: Various UUID packages available

Best Practices for UUID Usage

• Storage: Store as native UUID type when available, or as CHAR(36)
• Indexing: Consider using binary format for better index performance
• Validation: Always validate UUID format before processing
• Documentation: Document which UUID version your system uses
• Consistency: Use the same UUID version throughout your application
• Testing: Include UUID generation in unit tests

Frequently Asked Questions