Generate cryptographically secure UUID v4 identifiers for databases, APIs, and applications. Bulk generation with multiple format options.
Cryptographically secure random
Generate hundreds at once
Standard, uppercase, no hyphens
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Everything you need to generate unique identifiers for databases, APIs, and distributed systems.
Generate standard-compliant UUID v4 identifiers using cryptographically secure random number generation for maximum uniqueness.
Generate hundreds or thousands of UUIDs at once for database seeding, test data creation, or preparing identifiers in advance.
Output UUIDs in standard format (lowercase with hyphens), uppercase, or without hyphens to match your system requirements.
Uses the Web Crypto API for cryptographically strong random values, ensuring UUIDs are suitable for security-sensitive applications.
Instantly copy generated UUIDs to clipboard or replace your editor content. Seamless integration with your development workflow.
Generated UUIDs follow the RFC 4122 specification, ensuring compatibility with databases, APIs, and tools expecting standard UUIDs.
550e8400-e29b-41d4-a716-446655440000
Use UUIDs as primary keys for tables in distributed databases where sequential IDs are impractical or create bottlenecks.
Create unique identifiers for API resources that don't expose sequential information about your data.
Generate unpredictable session identifiers for authentication systems requiring high-entropy tokens.
Create unique filenames for uploaded content, generated reports, or objects in cloud storage systems.
Populate test databases with realistic unique identifiers that match production UUID formats.
Enable multiple nodes to create unique identifiers independently without coordination or collision risk.
The UUID specification defines several versions, each with different generation methods. Version 4, which our generator produces, uses random or pseudo-random numbers and is the most commonly used for general applications.
Based on timestamp and MAC address. Reveals generation time and hardware.
Generated from namespace and name using MD5. Deterministic - same input gives same UUID.
122 random bits. No information leakage. Most widely used for general purposes.
Like version 3 but uses SHA-1. Better security than MD5 for deterministic UUIDs.
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It's formatted as 32 hexadecimal digits displayed in five groups separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are designed to be unique across all devices and time without requiring a central authority.
UUID and GUID (Globally Unique Identifier) are essentially the same thing. UUID is the standard term used in most programming contexts and defined by RFC 4122, while GUID is Microsoft's terminology used in Windows and .NET environments. Both refer to the same 128-bit identifier format and can be used interchangeably.
Our generator creates UUID version 4 (UUIDv4), which uses random or pseudo-random numbers. Version 4 UUIDs are the most commonly used because they're simple to generate and don't require any special input like timestamps or MAC addresses. The random nature makes them ideal for most applications.
UUIDs are extremely unique. A UUID v4 has 122 random bits, resulting in 5.3 x 10^36 possible combinations. The probability of generating a duplicate is astronomically low - you'd need to generate about 2.71 quintillion UUIDs to have a 50% chance of collision. For practical purposes, UUIDs can be considered unique.
Yes! Our generator supports bulk UUID generation. You can generate any quantity of UUIDs in a single batch, which is useful for populating databases, creating test data, or preparing identifiers for new records. Each UUID is guaranteed to be unique within the generated batch.
UUIDs work well as primary keys in many scenarios, especially for distributed systems where multiple servers create records independently. They eliminate the need for sequential ID coordination. However, consider that UUIDs are larger than integers (16 bytes vs 4-8 bytes) and random UUIDs can cause index fragmentation. For single-database applications, auto-incrementing integers may be more efficient.
Click Generate > UUID in the toolbar.
Enter how many UUIDs you need.
Select standard, uppercase, or no hyphens.
Copy to clipboard or replace content.
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