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UUID Generator

Generate random UUIDs (v4) instantly. Bulk generate and copy.

UUID Version

Bulk Generate

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About UUID Generator

Free UUID v4 generator that creates universally unique identifiers using cryptographically secure random numbers. Generate single or bulk UUIDs instantly, copy individual IDs or all at once, and toggle between uppercase and lowercase formats. Essential for developers building databases, designing APIs, creating unique resource identifiers, and testing systems that require globally unique IDs.

Frequently Asked Questions

What is a UUID and when should I use one?

A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically guaranteed to be unique across all systems. Use UUIDs as primary keys in databases, unique resource identifiers in APIs, session tokens, and anywhere you need a globally unique ID without a central authority.

Are the generated UUIDs truly random?

Yes. The tool uses your browser's crypto.getRandomValues() function, which provides cryptographically secure random numbers. UUID v4 contains 122 random bits, making collisions virtually impossible.

What is the difference between UUID and GUID?

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are the same thing. UUID is the standard term used in the RFC 4122 specification, while GUID is Microsoft's terminology. They follow the same format: 8-4-4-4-12 hexadecimal characters (e.g., 550e8400-e29b-41d4-a716-446655440000).

Can two UUIDs ever be the same?

While theoretically possible, a UUID v4 collision is astronomically unlikely. With 122 random bits, you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a single collision. For all practical purposes, every UUID generated is unique.

Is this UUID generator free?

Yes, completely free with no signup. Generate single or bulk UUIDs instantly, copy them individually or all at once, and toggle between uppercase and lowercase formats. Everything runs in your browser with no data sent to any server.

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About UUID Generator

Frequently Asked Questions

What is a UUID and when should I use one?

Are the generated UUIDs truly random?

Yes. The tool uses your browser's crypto.getRandomValues() function, which provides cryptographically secure random numbers. UUID v4 contains 122 random bits, making collisions virtually impossible.

What is the difference between UUID and GUID?

Can two UUIDs ever be the same?

Is this UUID generator free?

Bulk Generate

About UUID Generator

Frequently Asked Questions

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Bulk Generate

About UUID Generator

Frequently Asked Questions

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Base64 Encoder/Decoder

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Every customer is unique. Give each one a real reply, every time.