UUID v4
e.g. 550e8400-e29b-41d4-a716-446655440000
UUID Generator
Generate UUID v4 (random) or nil UUIDs instantly. Free online UUID generator that produces RFC 4122-compliant universally unique identifiers in your browser.
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Results
Generated UUIDs
| Detail | Value |
|---|---|
| Quantity |
What is this calculator for?
Generate standards-compliant UUID v4 (random) identifiers or nil UUIDs, instantly and entirely in your browser.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- How many? — enter a numeric amount. A typical How many? would be 1.
- Version — enter a choice from the options.
- Format — enter a choice from the options.
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- How many?
- a numeric amount range 1–100 · required
- Version
- a choice from the options (UUID v4 (random), Nil UUID) · required
- Format
- a choice from the options (Standard (8-4-4-4-12), Digits + lower (short id)) · required
About This Calculator
This free UUID Generator produces RFC 4122 Version 4 (random) UUIDs using the browser secure random number generator, or a static nil UUID. A UUID is a 128-bit value formatted as 8-4-4-4-12 hexadecimal groups — the chance of two generated UUIDs colliding is astronomically small.
Generate a single UUID or a batch of up to 100 at once. All generation happens locally in your browser; nothing is transmitted to a server.
Worked Examples
Frequently Asked Questions
Why use a UUID instead of a normal ID?
UUIDs can be generated independently (offline, or on any device) without coordination and are virtually guaranteed unique, which is ideal for distributed systems and databases.
Can two UUIDs ever match?
The probability of a collision among random v4 UUIDs is minuscule (roughly 1 in 10^38 per pair), making collisions practically impossible for real-world workloads.