Are these UUIDs cryptographically random?

Yes. All UUIDs are generated locally using your browser's native `crypto.randomUUID()` or `crypto.getRandomValues()` API.

Updated: August 2026 • Verified v1.2

Bulk UUID v4 & GUID Batch Generator

Developer ToolsHigh Usage

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

Cryptographic Entropy: UUID v4 = 128-bit random bitstream formatted as 8-4-4-4-12 hex

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Understanding Your Results

Generates cryptographically random UUID v4 identifiers in browser memory using Web Crypto APIs with 1-click download.

Practical Guidance & Next Steps

UUID v4 provides 122 bits of cryptographic entropy, guaranteeing near-zero collision probability across distributed systems.

What is this?

A developer productivity utility that produces batches of RFC 4122 compliant UUID v4 identifiers.

How does it work?

1. Select quantity (1 to 500 UUIDs). 2. Toggle hyphens, uppercase casing, or GUID braces. 3. Copy all generated UUIDs or download as a `.txt` / `.json` file in 1 click.

Why use it?

Quickly generates mock primary keys and seed data for SQL databases and APIs.

Technical Scope & Calculation Limitations

Generates standard RFC 4122 Version 4 random UUIDs.

Frequently Asked Questions

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially identical 128-bit identifiers, with GUID being Microsoft's implementation term.

Windows Desktop & Widget Options