UUID Generator

A Universally Unique Identifier (UUID) is a 128-bit label used for identifying information in computer systems. Standard UUIDs are represented as 32 hexadecimal digits displayed in five groups separated by hyphens (8-4-4-4-12 representation). They allow developers to generate unique keys across distributed networks without requiring a central coordination authority.

UUID format: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
M = UUID Version (e.g., 1, 4, 7)
N = UUID Variant (typically 8, 9, a, or b)

Version 4 UUIDs are generated using cryptographically strong random or pseudo-random numbers. Out of the 128 bits, 6 bits are reserved for variant and version info, leaving 122 bits of pure entropy. If you are generating millions of IDs, you can easily inspect and validate your database payloads with our JSON Formatter.

// Native browser-based cryptographic generation
const randomId = crypto.randomUUID();
console.log(randomId); 
// Output: f81d4fae-7dec-11d0-a765-00a0c91e6bf6

Version 7 UUIDs combine a millisecond-precision Unix timestamp with high-entropy random data. By putting the timestamp at the beginning of the identifier, UUID v7 achieves lexicographical sortability. This structure is highly optimized for B-Tree indexing, preventing index fragmentation and reducing database write times. If you need to verify hash signatures for keys, check out our Hash Generator.

| timestamp (48 bits) | ver (4 bits) | rand_a (12 bits) | var (2 bits) | rand_b (62 bits) |
|   time since epoch  |     0111     |   random noise   |      10      |   random noise   |

Version 1 UUIDs are time-based identifiers that utilize the host computer's MAC address (node ID) and a 60-bit timestamp representing the number of 100-nanosecond intervals since October 15, 1582. While useful for sequencing, they reveal the generator's network card MAC address and precise creation time. To process these identifiers inside structured strings, you can use our RegEx Tester to test extraction patterns.

TimeLow (32 bits) - TimeMid (16 bits) - TimeHighAndVersion (16 bits) - ClockSeqAndVariant (16 bits) - NodeID (48 bits)

Different developer platforms require varying formats for GUIDs and UUIDs. For instance, Microsoft COM uses curly braces, and some systems store keys as raw 32-character hexadecimal strings without hyphens to save space. Our generator lets you customize these options. If you need to clean up lists containing duplicate UUID formats, our Duplicate Line Remover can help.

Standard:  f81d4fae-7dec-11d0-a765-00a0c91e6bf6
No hyphens: f81d4fae7dec11d0a76500a0c91e6bf6
Uppercase:  F81D4FAE-7DEC-11D0-A765-00A0C91E6BF6
Braced:    {f81d4fae-7dec-11d0-a765-00a0c91e6bf6}

Unlike online tools that generate identifiers on remote servers, our tool is 100% client-side. We use native browser crypto libraries to ensure high entropy without sending data over the internet. This maintains total security. If you need to encode generated values for URL query strings, you can check our URL Encoder / Decoder or decode tokens using our JWT Decoder.

// Verification of cryptographic secure randomness source
const hasSecureCrypto = typeof window !== 'undefined' && 
  window.crypto && 
  typeof window.crypto.getRandomValues === 'function';
console.log("Secure source active:", hasSecureCrypto);