A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters (e.g. 550e8400-e29b-41d4-a716-446655440000). Version 4 UUIDs are randomly generated and have astronomically low collision probability.

Are the generated UUIDs truly unique?

UUID v4 uses cryptographically secure random values from crypto.getRandomValues(). The probability of generating two identical UUIDs is so low (1 in 2^122) that it is effectively impossible in practice.

Is the UUID generation secure?

Yes — all UUIDs are generated using the browser's crypto.getRandomValues() API, which provides cryptographically strong randomness. No data is sent to any server.

Can I generate UUIDs without hyphens?

Yes — toggle the "Without hyphens" format option to produce compact 32-character hex strings instead of the standard hyphenated format.

Can I generate multiple UUIDs at once?

Yes — use the quantity input to generate between 1 and 100 UUIDs at a time. All results are displayed in a scrollable list with individual and bulk copy options.

UUID Generator

Generate cryptographically secure random UUIDs (v4) in bulk. Copy individual UUIDs or all at once.

Your files never leave your device

Quantity

UppercaseInclude hyphens

How to UUID Generator

Choose a quantity (1 to 100) using the input.
Select your preferred format: uppercase, lowercase, with or without hyphens.
Click Generate to produce the UUIDs instantly.
Copy individual UUIDs with the copy icon, or click Copy All for the full list.

Why Use This Tool?

UUIDs are essential for uniquely identifying records in databases, distributed systems, and APIs. UUID v4 uses cryptographic randomness making collisions practically impossible. All generation runs locally in your browser — no data leaves your device.

UUID Generator

How to UUID Generator

Why Use This Tool?

Frequently Asked Questions