🆔 UUID Generator
Quick answer
A UUID v4 is a 128-bit identifier with 122 random bits, written as 32 hex digits in five groups like 550e8400-e29b-41d4-a716-446655440000. Random v4 UUIDs are effectively unique: you would need to generate billions before a collision becomes likely.
Click Generate to create your first batch of random UUID v4 values.
✅ 100% free · 🔒 Runs in your browser — files never leave your device · 🚫 No sign-up
How to use the UUID Generator
- Enter how many UUIDs you need (1 to 500).
- Tick UPPERCASE or untick hyphens if your system needs a different format.
- Click Generate UUIDs.
- Copy the whole list with Copy all, or select individual lines manually.
Frequently asked questions
What is the difference between a UUID and a GUID?
They are the same thing in practice. GUID (Globally Unique Identifier) is Microsoft's name for the UUID standard; both use the same format and version 4 is random.
Are these UUIDs really random and safe to use as IDs?
Yes. They are generated with the browser's cryptographically secure random source (crypto.randomUUID or crypto.getRandomValues), the same quality you should use for database keys and tokens.
Can two generated UUIDs ever be identical?
In theory yes, in practice almost never. A v4 UUID has about 5.3 × 10³⁶ possible values, so accidental duplicates are astronomically unlikely.