CyberCodeUUID Generator (v4)
Free online UUID v4 generator. Generate one or hundreds of cryptographically random UUIDs (GUIDs) instantly — with uppercase option, copy and download. 100% in-browser.
What is a UUID and how unique is it really?
A UUID (Universally Unique Identifier) is a 128-bit ID written as 36 characters, like 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated from 122 random bits, letting independent systems create IDs with no coordination and effectively no collision risk.
How unlikely is a collision? You would need to generate about 2.7 quintillion UUIDs to reach even a 50% chance of one duplicate. GUID is Microsoft's name for the same standard — they are interchangeable.
How to use
- 01Choose how many UUIDs you need (1–500).
- 02Toggle UPPERCASE if your system requires capital letters.
- 03Click Generate UUIDs.
- 04Copy all UUIDs with one click.
Frequently asked questions
- What is a UUID v4?
- A UUID v4 is a 128-bit identifier generated from random data, formatted as 36 characters (8-4-4-4-12). The chance of two v4 UUIDs colliding is astronomically small.
- Is a GUID the same as a UUID?
- Yes — GUID is Microsoft's name for the same standard. Any system expecting a GUID will accept these UUIDs.
- How random are the generated UUIDs?
- They are generated by crypto.randomUUID(), which uses the browser's cryptographically secure random number generator.