UUID Generator

Generate cryptographically random UUIDs v4. Bulk generation, multiple formats, one-click copy.

Count

Format

Wrap in quotes

🎲

UUID v4

Version 4 UUIDs are generated using cryptographically secure random numbers via crypto.randomUUID().

♾️

Collision-Proof

With 2¹²² possible values, the probability of generating two identical UUIDs is astronomically small.

📦

Bulk Ready

Generate up to 1,000 UUIDs at once and download as a text file for database seeding.

🔒

Private

All generation is done locally. Your UUIDs never leave your browser.

About This Tool

The DevKit4You UUID Generator helps developers create cryptographically secure UUIDs (Universally Unique Identifiers) instantly in their browser. It supports bulk UUID generation, multiple formatting styles, and one-click copy functionality for fast development workflows.

UUIDs are 128-bit identifiers designed to be globally unique across systems, devices, and databases without requiring centralized coordination. All UUIDs are generated locally in your browser for maximum privacy and performance using crypto.randomUUID().

Database Primary Keys API Resource IDs Distributed Systems Message Queues Test Fixtures Session Identifiers Database Seeding Microservices

How to Use

Select UUID Count

Choose how many UUIDs to generate — from 1 up to 1,000 at once. Use larger counts for database seeding, mock API responses, or test datasets.

Choose a Format

Select the output format that fits your use case: standard with dashes, uppercase, no-dash, braced {UUID}, or URN-prefixed urn:uuid:…. Optionally wrap values in quotes for JSON or CSV output.

Click Generate

Press GENERATE to instantly create your UUIDs. A single UUID is displayed prominently; bulk output appears in a copyable textarea.

Copy or Download

Use the Copy button for a single UUID, Copy All for bulk output, or Download .txt to save the full list as a text file for use in SQL inserts, JSON fixtures, or CSV datasets.

Key Capabilities

🎲 Cryptographically Secure UUID v4

Generate RFC 4122-compliant UUID version 4 identifiers using crypto.randomUUID() — the same browser-native secure random generator used by cryptographic applications.

550e8400-e29b-41d4-a716-446655440000

📦 Bulk Generation

Generate up to 1,000 UUIDs at once for database seeding, mock APIs, test datasets, and batch processing. Download the complete list as a plain text file in one click.

🧩 Multiple Formats

Standard dashes, uppercase, hyphenless, braced {…}, and URN-prefixed formats. Quote-wrapping available for direct use in JSON or CSV without manual editing.

♾️ Collision-Proof

UUID v4 provides 122 random bits — over 5.3 undecillion possible values (5.3 × 10³⁶). The probability of generating two identical UUIDs is statistically negligible for any practical workload.

UUID Versions — Quick Overview

v1 — Timestamp + MAC Address

Uses the current timestamp combined with the device's MAC address to generate the UUID. Mostly used in legacy systems. Can leak hardware information since the MAC address is embedded in the output.

v3 — MD5 Namespace Hash

Deterministic UUIDs generated from a name and a namespace using MD5 hashing. The same input always produces the same UUID — useful for content-addressable identifiers, but not for security-sensitive contexts.

v4 — Random UUID Recommended

The most common and recommended version for general-purpose unique identifiers. Generated entirely from cryptographically secure random bits with no embedded timestamps or hardware data. This is what our tool generates.

v5 — SHA-1 Namespace Hash

Similar to v3 but uses SHA-1 hashing instead of MD5. Preferred over v3 when namespace-based deterministic UUIDs are needed, since SHA-1 is stronger than MD5 (though still not collision-resistant for security use).

v7 — Time-Ordered UUID

A modern sortable UUID format that embeds a millisecond-precision Unix timestamp in the most significant bits. Optimized for database indexing and chronological ordering — generating sequential UUIDs that sort naturally by creation time. Increasingly adopted in new systems that need both uniqueness and time-orderability.

For most applications, UUID v4 is the best default choice unless you specifically need time-ordered identifiers (v7) or deterministic name-based IDs (v5).

Example Usage

JSON record API / database

{
  "id": "550e8400-e29b-41d4-a716-446655440000",
  "name": "Lesson 1"
}

SQL insert database seeding

INSERT INTO users (id, name) VALUES
  ('550e8400-e29b-41d4-a716-446655440000', 'Alice'),
  ('6ba7b810-9dad-11d1-80b4-00c04fd430c8', 'Bob');

URN format URN prefix

urn:uuid:550e8400-e29b-41d4-a716-446655440000

Privacy & Transparency

🔐 Local UUID Generation

All UUIDs are generated entirely inside your browser using crypto.randomUUID(). No network requests are made during generation.

🚫 No Data Collection

We do not store, track, upload, or log generated UUIDs. Your generation history never leaves your device.

⚠️ UUIDs Are Identifiers, Not Secrets

UUIDs are designed for uniqueness, not for authentication or encryption. They should not be used directly as passwords, access tokens, or sensitive security credentials without additional security mechanisms.

🔒 Safe & Secure

UUID generation runs entirely in your browser using the Web Crypto API. Nothing is transmitted to any server. Your UUIDs are generated privately and instantaneously on your own device.

✅ Completely Free

Our tool is free to use with no limits on generation count or format. No account, no signup, no API key required — open the page and generate immediately.