UUID Generator

Instantly generate unique identifiers (UUID v4) right in your browser.
Unlimited, no registration, 100% free.

How to use the UUID Generator

Our UUID generator is designed for maximum speed and convenience. You don't need to install libraries or write scriptsβ€”just open the page and get the IDs you need.

  1. Select quantity: Use the slider or input field to specify how many IDs you need (from 1 to 100 at a time).
  2. Customize format:
    • UPPERCASE: Converts characters to uppercase (e.g. 4F3D...).
    • No hyphens: Removes separators, creating a continuous 32-character string (useful for database keys).
  3. Generate: Click the "Generate UUIDs" button. The results will appear instantly.
  4. Copy: Click the copy button next to a specific ID or use "Copy All" to copy the entire list to the clipboard.

Privacy Note: Generation occurs entirely on your device (client-side) using the Web Crypto API. Your UUIDs are never sent to our servers.

How to generate UUIDs in different programming languages

We've collected proven code examples for generating UUID v4 in the most popular languages. Use these snippets in your projects.

JavaScript / Node.jsNative

const uuid = crypto.randomUUID();

console.log(uuid);
// Output: "36b8f84d-df4e-4d49-b662-bcde71a8764f"

function uuidv4() {
  return "10000000-1000-4000-8000-100000000000".replace(/[018]/g, c =>
    (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
  );
}
PythonStandard Lib

import uuid

my_uuid = uuid.uuid4()

print(str(my_uuid))
# Output: f50ec0b7-f960-400d-91f0-c42a6d44e3d0

print(my_uuid.hex)
# Output: f50ec0b7f960400d91f0c42a6d44e3d0
PHPLaravel / Ramsey

// v 1:  ramsey/uuid
// composer require ramsey/uuid

use Ramsey\Uuid\Uuid;

$uuid = Uuid::uuid4();
echo $uuid->toString();

// v 2: Π’ Laravel Helper
use Illuminate\Support\Str;

$uuid = (string) Str::uuid();
Javajava.util

import java.util.UUID;

public class Main {
    public static void main(String[] args) {
        //  UUID v4
        UUID uuid = UUID.randomUUID();

        System.out.println(uuid.toString());
        // Output: 123e4567-e89b-42d3-a456-556642440000
    }
}
Gogoogle/uuid

package main

import (
	"fmt"
	"github.com/google/uuid" // go get github.com/google/uuid
)

func main() {
	id := uuid.New()
	fmt.Println(id.String())
    // Output: a0d9e86c-4b51-4e78-8b9d-5d9c2a3b1e4f
}
C# / .NETSystem

using System;

class Program {
    static void Main() {
        Guid g = Guid.NewGuid();

        Console.WriteLine(g.ToString());
        Console.WriteLine(g.ToString("N"));
    }
}
Rustcrate 'uuid'

// Cargo.toml: uuid = { version = "1.4", features = ["v4", "fast-rng"] }

use uuid::Uuid;

fn main() {
    let id = Uuid::new_v4();
    println!("{}", id);
}
RubyStandard Lib

require 'securerandom'

uuid = SecureRandom.uuid

puts uuid
# Output: 2d931510-d99f-494a-8c67-87feb05e1594

Where are UUIDs/GUIDs used?

UUIDs (Universally Unique Identifiers) have become a standard in modern development. Here are the main use cases:

  • Primary Keys in Databases: In distributed systems, using incremental IDs (1, 2, 3, etc.) causes conflicts. UUIDs allow records to be created on different servers without the need for synchronization.
  • Session Tokens and API Keys: Due to their high entropy, UUIDs v4 are virtually impossible to guess by brute force, making them an excellent choice for temporary tokens.
  • Names of Uploaded Files: To avoid overwriting files with the same name (e.g. image.jpg), developers rename them to {uuid}.jpg when uploading.
  • Idempotency Keys: In payment systems, UUIDs are used as idempotency keys, ensuring that a transaction is not processed twice when requested again.

Frequently Asked Questions (FAQ)

How unique is a v4 UUID?

The probability of a collision (match) is astronomically small. The total number of possible matches is 2^122. To achieve a 50% chance of a collision, you would need to generate 1 billion UUIDs per second for 85 years. For all practical purposes, it is considered unique.

What's the difference between a GUID and a UUID?

Technically, they are the same thing. UUID is a standard term (RFC 4122). GUID (Globally Unique Identifier) ​​is a term used by Microsoft. They are identical in structure and length (128 bits).

Is it safe to use UUIDs for passwords?

No. Although UUIDs are difficult to predict, they are not intended to be used as passwords. It's better to use a specialized password generator that includes special characters and has high entropy.