Utilz
UUID Generator
Generate random UUIDs (v4) instantly
Why Use This Tool?
- Generate cryptographically random UUID v4 values with one click using your browser's crypto API.
- Bulk generate up to 100 UUIDs at once with customizable format options.
- No server required -- all generation happens instantly in your browser.
How It Works
UUID v4 follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is a random hexadecimal digit and y is one of 8, 9, a, or b. The 4 indicates version 4, and 122 of the 128 bits are randomly generated, giving 5.3 × 10³⁶ possible values.
How to Use
- Click Generate to create a new UUID
- Set the quantity (1-100) for bulk generation
- Toggle uppercase, lowercase, or no-hyphen format
- Click Copy to copy all UUIDs to clipboard
FAQ
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUID v4 is generated using random numbers and is the most commonly used version.
Are these UUIDs truly random?
Yes. This generator uses crypto.randomUUID() which relies on a cryptographically secure random number generator built into your browser.
What is the difference between UUID and GUID?
UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's term for what the rest of the industry calls UUID.
Can two UUIDs ever be the same?
Theoretically yes, but the probability is astronomically low. UUID v4 has 122 random bits, giving 5.3 × 10^36 possible values. A collision is practically impossible.
How many possible UUIDs are there?
A UUID v4 has 122 random bits, giving approximately 5.3 x 10^36 possible values. The probability of generating two identical UUIDs is astronomically low, even generating billions per second.