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UUID
What is a UUID (Universally Unique Identifier)?
A UUID (or GUID in the Microsoft ecosystem) is a standardized 128-bit number used to identify information in computer systems uniquely. Because of the vast number of possible combinations (over 340 undecillion), you can safely generate UUIDs independently across different databases and servers without worrying about duplicate IDs (collisions).
What does this tool do?
- • Generates secure Version 4 UUIDs instantly.
- • Supports bulk generation (up to 1,000 at once).
- • Runs entirely locally (zero server uploads).
- • Utilizes the native Web Crypto API for performance.
Common Use Cases
- • Primary keys for distributed SQL/NoSQL databases.
- • Secure, unpredictable session tokens.
- • Unique filenames for cloud storage uploads.
- • Mock data generation for software testing.
How to Generate UUIDs
How it Works
- 1
Set Your Required Quantity
If you only need a single UUID, you can skip this step. For bulk generation (e.g., seeding a database), enter a number between 1 and 1000 in the 'Generate' input field. - 2
Click Generate
Hit the 'Generate' button to instantly create a fresh list of Version 4 UUIDs using native cryptographic random generation. - 3
Copy to Clipboard
Click the 'Copy' button to safely copy all generated UUID strings (separated by new lines) directly to your clipboard for immediate use.
Understanding the UUID Structure
| Group | Length (Chars) | Example & Meaning |
|---|---|---|
| Group 1 | 8 | 123e4567 Random hex digits. |
| Group 2 | 4 | e89b Random hex digits. |
| Group 3 | 4 | 12d3 The first digit is the version number (e.g., "4" for v4). |
| Group 4 | 4 | a456 The first digit indicates the UUID variant. |
| Group 5 | 12 | 426614174000 Random hex digits. |
Frequently Asked Questions
Frequently Asked Questions
A UUID (Universally Unique Identifier), sometimes called a GUID (Globally Unique Identifier) by Microsoft, is a 128-bit label used in software. It is formatted as a 36-character alphanumeric string (including hyphens). The core purpose of a UUID is to enable distributed systems to uniquely identify information without significant central coordination.
Yes! Our tool utilizes the browser's native Web Crypto API (`crypto.randomUUID()`) under the hood. This ensures that the generated v4 UUIDs are cryptographically secure and genuinely random, not just pseudo-random.
Version 4 UUIDs are generated using random or pseudo-random numbers, making them the most commonly used version today. Version 1 uses the computer's MAC address and a timestamp, Version 3 and 5 are name-based (hashed via MD5 and SHA-1 respectively), and Version 4 provides pure randomness.
Astronomically low. A Version 4 UUID has 122 bits of randomness, meaning there are 5.3 x 10^36 possible UUIDs. You would need to generate 1 billion UUIDs every second for 85 years just to reach a 50% probability of a single collision.