UUID VERSION 4 · 122 RANDOM BITS

UUID v4 Generator

Genera UUID v4 identifiers online con our gratuito UUID v4 Generator. Crea secure casuale UUID v4 values in bulk, choose formatoting options, copy risultati e download them as TXT o JSON.

Browser-based generation • Uses Web Crypto API when available

Number of UUIDs

Output Format

UUID Version Version 4

Total Size 128 bits

Random Bits 122 bits

Random Source Web Crypto API

Generated UUID v4 Values

Generated: 0 Valid v4: 0 Format: Lowercase

Click Generate UUID v4 to create UUIDs.

Che cos'è a UUID v4?

UUID v4 è un casualmente generato Universally Unique Identifier.A UUID contiene 128 bits e is normally represented as a 36-characterhexadecimal string including hyphens.

UUID v4 uses casuale data per most of its bits. Six bits are reservedfor the UUID versione e variante, leaving 122 bitsfor casuale data.

UUID v4 Formato

A standard UUID v4 follows the8-4-4-4-12hexadecimal pattern:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The first hexadecimal character of the third group identifiesversione 4. The variante bits are contained in the first characterof the fourth group.

UUID v4 Esempio

550e8400-e29b-41d4-a716-446655440000

In this example, the 4identifies the UUID asversione 4. The UUID variante is represented by the appropriatevariante bits in the fourth group.

UUID v4 Formatoo di outputs

Lowercase:standard UUID formato using lowercase hexadecimal characters.
Uppercase:standard UUID formato using uppercase hexadecimal characters.
Compact:32 hexadecimal characters senza hyphens.
Graffe:UUID enclosed inside curly braces.
URN:UUID represented using the UUID URN formato.

Why Use UUID v4?

No central ID server is required to generate identifiers.
UUID v4 fornisce a very large casuale identifier space.
It is widely supported by programming languages e database.
UUIDs can be generato independently across different systems.
They are useful per database records, APIs, applicazioni e distributed systems.

UUID v4 vs UUID v7

UUID v4 is primarily casuale, while UUID v7 contiene a Unixmillisecond timestamp followed by casuale data. UUID v7 can thereforeprovide time-ordered identifiers, while UUID v4 is useful whencasuale identifiers are preferred.

Frequently Asked Questions

UUID v4 è un UUID versione that is generato primarily da casuale o pseudo-casuale data. It contiene 128 bits in total, con specific bits reserved per the versione e variante.

UUID v4 contiene 122 bits of casuale data. The remaining 6 bits sono utilizzati to identify the UUID versione e variante.

Il generatore creates 16 casuale bytes in your browser e sets the required UUID v4 versione e RFC variante bits before displaying the UUID.

UUID v4 fornisce a very large identifier space e is commonly used quando an applicazione needs identifiers senza relying on a central ID-generation service.

Sì. Puoi generate multiple UUID v4 identifiers in one operation e copy o download the complete result.

Sì. Il generatore supporta lowercase e uppercase UUID output as well as compact output senza hyphens.

Sì. Generad UUID v4 values can be downloaded as a TXT file o structured JSON data.

Sì. UUID v4 generation is performed locally in your browser using the Web Crypto API quando it is available. The generato UUID values do not need to be sent to a server.

UUID v4 is primarily casuale, while UUID v7 include a Unix millisecond timestamp e casuale data, making UUID v7 suitable per identifiers that benefit da time-ordered characteristics.