UUID Generator
Generate random UUID v4 values instantly — create up to 10 at once, copy one or all. No server needed, runs entirely in your browser.
About This Tool
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems without requiring a central authority. UUID v4, the most widely used variant, is generated using random or pseudo-random numbers, making collisions statistically negligible. QuickKit's UUID Generator creates cryptographically random v4 UUIDs directly in your browser using the Web Crypto API — no server calls, instant generation.
Features
- ✓Cryptographically Random — Uses the browser's built-in crypto.randomUUID() (Web Crypto API) for high-quality randomness, not Math.random().
- ✓Bulk Generation — Generate up to 100 UUIDs at once and copy the entire list to your clipboard in one click.
- ✓One-click Copy — Copy any single UUID or the full batch to your clipboard instantly.
- ✓Offline & Private — Everything runs locally in your browser. No UUIDs are sent to any server or recorded.
- ✓RFC 4122 Compliant — Generated UUIDs follow the standard 8-4-4-4-12 hyphenated format (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx).
FAQ
- What is a UUID v4?
- UUID v4 is a random UUID defined in RFC 4122. It consists of 32 hexadecimal digits displayed in five groups separated by hyphens. The "4" in the third group indicates version 4, and the first 1–2 bits of the fourth group are fixed variant bits. All other 122 bits are randomly generated.
- Can two UUIDs ever be the same?
- Theoretically yes, but the probability is astronomically low. With v4 UUIDs there are 2^122 ≈ 5.3 × 10^36 possible values. You would need to generate roughly 1 billion UUIDs per second for 85 years before the probability of a single collision exceeded 50%. For all practical purposes, they are unique.
- What is the difference between UUID and GUID?
- GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are technically identical in format and purpose — the terms are used interchangeably. GUIDs are commonly seen in Windows/.NET environments, while UUID is the cross-platform standard term.
- When should I use a UUID instead of an auto-increment ID?
- Use UUIDs when you need IDs that are safe to generate on the client side, when merging data from multiple sources (no collision risk), or when you want to avoid exposing sequential IDs (which reveal record counts). Auto-increment integers are simpler and slightly faster for pure server-side, single-database use cases.