SoftnagFree

UUID / GUID Generator

PopularDeveloper Tools

Generate cryptographically secure Version 4 (random) and Version 1 (timestamp-based) UUIDs / GUIDs individually or in bulk.

100% In-Browser Privacy
Zero Server Uploads
1.5645be48-6b66-4e43-9fca-b7697b134cd7
2.df925f45-f1ec-4764-9b38-7434f98cacfd
3.290f58c1-7bad-43eb-8b84-2d2c1973ae50
4.7a75df5b-418e-4e99-9b3f-dde780f164ba
5.d3c2ae6f-f1fc-43f4-885a-29aae3b5255c

Who Is UUID / GUID Generator Built For?

Database administrators generating primary keys for SQL, PostgreSQL, and MongoDB records
Software engineers creating unique transaction IDs, correlation tokens, and idempotency keys
QA testers creating mock datasets and unique user identifiers for testing suites

Key Benefits & Core Capabilities

Cryptographically Secure Entropy

Generates UUIDs using the browser’s Web Crypto API (crypto.getRandomValues) for true randomness.

Bulk Batch Generation

Generate up to 10,000 UUIDs at once with one-click copy and plain text download.

Multiple Formatting Options

Export standard hyphenated UUIDs, uppercase, lowercase, no-hyphens (compact), or base64 GUIDs.

100% Offline Capable

Runs entirely on your local CPU; zero API calls or network latency.

Step-by-Step Guide: How to Use UUID / GUID Generator

  1. 1
    Set Quantity & OptionsChoose how many UUIDs to generate (1 to 100), hyphens, and uppercase/lowercase.
  2. 2
    Click GenerateGenerate fresh cryptographically random v4 UUIDs using window.crypto.getRandomValues.
  3. 3
    Copy UUIDsCopy all generated UUIDs or click individual items to copy.

How It Works & Technical Architecture

A Version 4 UUID consists of 128 bits of data: 122 bits of cryptographically secure random entropy, 4 bits specifying version 4 (0100), and 2 bits specifying variant 1 (10xx).

The Softnag UUID Generator seeds a 16-byte Uint8Array using window.crypto.getRandomValues(), sets the RFC 4122 version and variant bits, and formats the byte array into canonical 8-4-4-4-12 hexadecimal notation.

The probability of a collision in UUID v4 is negligible (approximately 1 in 2^122), making it globally unique for distributed databases.

Practical Use Cases & Applications

Database Primary Keys

Generate distributed, un-guessable primary keys for PostgreSQL, MySQL, and DynamoDB tables.

API Correlation & Request IDs

Create unique trace IDs for microservice logging and OpenTelemetry request tracking.

E-commerce Order Numbers

Author unique transaction reference codes and idempotency tokens for payment gateways.

Automated Test Fixtures

Generate thousands of unique user IDs and order entities for automated test runs.

Supported Formats & Input Options

Standard (8-4-4-4-12)Uppercase / LowercaseNo Hyphens (Compact 32-char)Curly Braces {}

Frequently Asked Questions

What is a UUID / GUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify information in computer systems without central coordination.

Is the randomness cryptographically secure?

Yes. Softnag uses the browser’s native Web Crypto API (crypto.getRandomValues), which draws entropy from your operating system’s cryptographic CSPRNG.

Can two generated UUIDs ever collide?

The collision probability is astronomically small: you would need to generate 1 billion UUIDs per second for 85 years before having a 50% chance of a single collision.

Can I generate thousands of UUIDs at once?

Yes. Enter your desired quantity (up to 10,000) and click Generate to produce a downloadable list in milliseconds.

Are generated UUIDs recorded on any server?

No. UUIDs are generated directly on your local device with zero network communication.

What is a UUID version 4?

A Version 4 UUID is a 128-bit identifier created using cryptographically strong pseudo-random numbers, offering virtually zero chance of collision.