UUID Generator - Free Online UUID/GUID Tool
Generate universally unique identifiers (UUIDs/GUIDs) instantly. Perfect for database primary keys, API tokens, and unique identifiers in your applications.
Max: 1000 UUIDs
No UUIDs generated yet
Click "Generate UUIDs" to create unique identifiers
What is a UUID?
A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems. UUIDs are typically represented as 32 hexadecimal digits displayed in five groups separated by hyphens, in the form 8-4-4-4-12 (example: 550e8400-e29b-41d4-a716-446655440000).
This tool generates UUID version 4 (random), which are created using random or pseudo-random numbers. The chance of generating a duplicate UUID is so astronomically low that it can be considered practically impossible in real-world applications, making them perfect for distributed systems where centralized ID coordination isn't feasible.
All UUID generation happens entirely in your browser using the Web Crypto API, ensuring your identifiers are truly random and secure. No data is sent to any server, and no logging occurs.
Common Use Cases
Database Primary Keys
Use UUIDs as primary keys in distributed databases to avoid ID collisions across multiple servers or shards.
API Tokens
Generate unique API keys, session tokens, or request IDs for tracking and authentication purposes.
File Naming
Create unique filenames to prevent conflicts in storage systems and avoid overwriting existing files.
Transaction IDs
Track financial transactions, orders, or any operations that require globally unique identification.
Why Use Our UUID Generator?
Cryptographically Secure
Uses the Web Crypto API for true random number generation, ensuring your UUIDs are secure and unpredictable.
Bulk Generation
Generate up to 1000 UUIDs at once for batch operations, testing, or database seeding.
Developer Friendly
Copy individual UUIDs or download all as a file. Perfect for development workflows and automation.
Frequently Asked Questions
What is a UUID and how is it used?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are commonly used as database primary keys, API tokens, session identifiers, and file names where globally unique identification is required without central coordination.
Are the generated UUIDs truly random and secure?
Yes, this tool uses the Web Crypto API (crypto.randomUUID()) which provides cryptographically secure random number generation. The generated UUIDs are version 4 (random) and are suitable for security-sensitive applications. The chance of generating duplicate UUIDs is astronomically low (approximately 1 in 2^122).
Can I generate multiple UUIDs at once?
Yes! You can generate up to 1,000 UUIDs in a single batch. Simply enter the number you need, click "Generate UUIDs", and you can copy all at once or download them as a text file. This is perfect for database seeding, testing, or bulk operations.
Is my data safe when using this tool?
Absolutely. All UUID generation happens entirely in your browser using JavaScript. No UUIDs are sent to any server, and no logging occurs. Your generated identifiers are completely private and never leave your device.
What's the difference between lowercase and uppercase format?
The format option simply changes whether the hexadecimal characters (a-f) in the UUID are displayed in lowercase or uppercase. Both formats are equally valid and the choice is purely a matter of preference or convention in your project. Most systems accept both formats interchangeably.
Do I need to sign up or pay to use this tool?
No, this tool is completely free to use with no signup required. There are no usage limits, no premium features, and no hidden costs. We believe developer tools should be accessible to everyone without barriers.
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