Random GUID Generator
Generate Globally Unique Identifiers for Any System
Need to use Random GUID Generator right now?
GUID is the term Microsoft ecosystems (like .NET and SQL Server) commonly use for what's the same underlying concept as a UUID — a randomly generated identifier unique enough to use as a primary key or object identifier without coordination. This tool generates cryptographically random ones instantly, ready to paste into your code or database.
Result
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
About Random GUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value, conventionally written as 32 hexadecimal digits grouped into five sections separated by hyphens (like `f47ac10b-58cc-4372-a567-0e02b2c3d479`), designed to be unique across systems, databases, and time without needing a central authority to hand out IDs. That property makes UUIDs the default choice for primary keys in distributed databases, unique identifiers for API resources, session tokens, and file names that need to be collision-free without coordinating with any other system.
This tool generates version 4 UUIDs, the most common variant, which are generated using cryptographically strong random numbers rather than being derived from a timestamp or hardware identifier (as older UUID versions were). Specifically, it uses `crypto.randomUUID()`, a built-in browser API backed by the same cryptographically secure random number generator used for security-sensitive operations — not `Math.random()`, which is not suitable for generating identifiers that need genuine unpredictability and uniqueness guarantees.
The odds of a collision are worth understanding concretely: a version 4 UUID has 122 random bits (6 bits are fixed to identify the version and variant), giving roughly 5.3 x 10^36 possible values. To have even a 50% chance of generating two identical UUIDs, you'd need to generate around 2.71 quintillion of them — a number so large that UUID collisions are treated as effectively impossible in practice for any realistic application.
You can generate up to 100 UUIDs at once, useful for seeding test data, pre-generating a batch of IDs for a bulk import, or quickly grabbing several unique identifiers for a script or configuration file without calling a generation function repeatedly in code.
How it works
- Choose how many you need. Enter a count from 1 to 100.
- Click Generate. Cryptographically random UUID v4 values are generated instantly.
- Copy them. Copy all generated UUIDs, one per line, ready to paste anywhere.
Examples
A generated UUID v4
Input
Click Generate
Output
f47ac10b-58cc-4372-a567-0e02b2c3d479