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UUID Generator

Generate UUID v4 and v1 unique identifiers

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About This Tool

A flexible UUID generator that creates universally unique identifiers in both v4 (random) and v1 (time-based) formats. Generate up to 100 UUIDs at once with options for uppercase output and removing dashes — perfect for database keys, API identifiers, and distributed systems.

Key Features

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Use Cases

id generator

Frequently Asked Questions

What is the difference between UUID v1 and v4?

UUID v1 is generated using the current timestamp and the machine's MAC address, making it time-ordered but potentially traceable. UUID v4 uses random numbers, providing better anonymity. Choose v4 for most use cases and v1 when you need chronological ordering.

How unique are the generated UUIDs?

UUID v4 has approximately 2^122 possible values, making the probability of a collision astronomically small. You would need to generate billions of UUIDs per second for millions of years to have a reasonable chance of a collision.

Can I generate UUIDs without dashes?

Yes, simply check the No Dashes option before generating. This produces a 32-character hexadecimal string instead of the standard 36-character format with dashes, which is useful for compact storage or specific API requirements.

What is the maximum number of UUIDs I can generate at once?

You can generate up to 100 UUIDs in a single batch. The count can be adjusted from 1 to 100, making it convenient to generate multiple identifiers for bulk operations like database seeding.

Are the generated UUIDs cryptographically secure?

UUID v4 uses Math.random() for generation, which is suitable for most applications but not recommended for security-critical purposes like password reset tokens. For security-sensitive use cases, consider using a dedicated cryptographic library.