UUID Generator Online
Generate cryptographically secure UUID v4 values instantly. Free, bulk generation up to 100 UUIDs, one-click copy — runs entirely in your browser.
e2669879-1320-4d45-8498-84b589489377Generated with crypto.randomUUID() — cryptographically secure · RFC 4122 UUID v4
What is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The standard format displays it as 32 hexadecimal digits split into 5 groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUIDs are designed to be generated without a central registry, meaning any computer can create a new UUID with near-zero probability of collision with any other UUID ever created.
UUID version 4 (UUID v4) is the most commonly used variant, generating all 128 bits randomly except for 4 version bits and 2 variant bits. With 122 bits of entropy, the number of possible UUID v4 values is 5.3 × 10^36 — a number so large that generating billions of UUIDs per second for millions of years would still be statistically unlikely to produce a duplicate.
UUIDs are essential in modern software development: used as primary keys in distributed databases (avoiding the need for auto-increment coordination), session identifiers, idempotency keys in APIs, file names, correlation IDs for distributed tracing, and anywhere a unique identifier is needed across multiple systems or services.
How to Use
- 1
Set the count (optional)
Enter how many UUIDs you need — from 1 to 100. The default is 1.
- 2
Click Generate
Click the Generate button to create cryptographically secure UUIDs instantly.
- 3
Copy your UUID(s)
Click Copy next to any individual UUID, or use the Copy All button to copy all generated UUIDs at once.
Features
- Generates UUID version 4 (random) per RFC 4122
- Uses crypto.randomUUID() — cryptographically secure
- Bulk generation: up to 100 UUIDs at once
- One-click copy per UUID or copy all
- Works entirely in your browser
- No data sent to any server
- Free with no limits or sign-up
- Instant generation with zero latency
Frequently Asked Questions
- QWhat is a UUID?
- UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. The standard format is 8-4-4-4-12 hexadecimal characters separated by hyphens.
- QWhat is UUID v4?
- UUID version 4 is randomly generated. It uses random or pseudo-random numbers for all 128 bits (with 4 bits for the version and 2 bits for the variant). It is the most commonly used UUID version.
- QAre these UUIDs truly unique?
- UUID v4 has 122 bits of randomness, resulting in 5.3 × 10^36 possible values. The probability of a collision is astronomically small — effectively zero for any practical use.
- QIs it safe to use these UUIDs in production?
- Yes. This tool uses the Web Crypto API (crypto.randomUUID), which is the same cryptographically secure source used by modern browsers and servers.
- QWhat are common use cases for UUIDs?
- UUIDs are used as primary keys in databases, session identifiers, correlation IDs for distributed tracing, file names, API keys, and anywhere a unique identifier is needed without a central registry.
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