UUID Generator
Generate random UUID v4 identifiers using the Web Crypto API. All processing happens locally in your browser.
UUID v4 Format
xxxxxxxx-xxxx-4xxx-[8-b]xxx-xxxxxxxxxxxxThe 4 indicates version 4 (random). The [8-b] indicates the variant (RFC 4122).
🔒 Privacy First: UUIDs are generated using the Web Crypto API in your browser. Nothing is sent to any server.
How to Use
- Set the number of UUIDs you need (1-100)
- Choose your format preferences (case, hyphens)
- Click Generate to create new UUIDs
- Copy individual UUIDs or all at once
- Download as a text file for bulk UUIDs
About UUIDs
UUIDs (Universally Unique Identifiers) are 128-bit identifiers designed to be unique without coordination. UUID v4 uses random numbers, providing 2^122 possible values - enough that collisions are astronomically unlikely.
UUIDs are commonly used as database primary keys, session identifiers, transaction IDs, and anywhere you need unique identifiers that don't reveal information about order or timing. The random nature of v4 UUIDs also makes them suitable for security-sensitive applications.
Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier standard used to uniquely identify information. Also known as GUID (Globally Unique Identifier), UUIDs are designed to be unique across all devices and time without requiring a central authority.
What is UUID v4?
UUID v4 is a randomly generated UUID. It uses random or pseudo-random numbers to generate the identifier, with certain bits set to indicate the version (4) and variant. UUID v4 has 122 random bits, providing approximately 5.3 x 10^36 unique combinations.
Are these UUIDs truly random and secure?
Yes, our generator uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically strong random values. This is the same API used for security-critical applications in browsers.
What's the difference between UUID and GUID?
UUID and GUID are essentially the same thing. UUID is the term used in most standards and Unix/Linux systems, while GUID (Globally Unique Identifier) is the term Microsoft uses. Both follow the same specification and format.
Can I generate UUIDs without hyphens?
Yes, our generator includes an option to remove hyphens from the generated UUIDs. The standard format includes hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000), but some systems prefer the compact format without them.
Are my generated UUIDs stored or tracked?
No, all UUID generation happens entirely in your browser using JavaScript and the Web Crypto API. No data is sent to any server, and we don't store or track the UUIDs you generate.