# UUID Version 4 Generator

Generate independent UUIDs with PHP cryptographic randomness.

[Open this tool](https://whatson.pk/developer-uuid-calculator/)

Category: Developer & Data

Random record identifiers help separate new entries without relying on a sequential label.

Generate the required UUIDs and check how they will be stored in the receiving system.

## Inputs and controls

* Number of UUIDs (identifiers). Allowed range: 1 to 100
* Output case: Lowercase; Uppercase

## How to use

* Choose output case. Enter number of UUIDs.

* Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

Version and variant bits follow the UUID v4 format with cryptographic randomness.


## Before relying on the result

UUIDs use random_bytes, version 4 and RFC variant bits. They are identifiers, not authentication secrets.


## Tool limitations

UUIDs use random_bytes, version 4 and RFC variant bits. They are identifiers, not authentication secrets.

## Questions

### Can a UUID replace an authentication secret?

No. These are identifiers. Authorization and database uniqueness still need their own controls.

### What should I check before using UUID Version 4 Generator?

Check Number of UUIDs and Output case. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T16:58:29+00:00

This profile describes the tool. It does not execute it or supply a professional certification.