UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. Version 4 UUIDs are randomly generated, making collision probability astronomically low.

Are UUIDs truly unique?

While not mathematically guaranteed, UUID v4 has 2^122 possible values. The probability of generating a duplicate is essentially zero for practical purposes.

When should I use UUIDs?

Use UUIDs as database primary keys, API resource identifiers, session tokens, or any time you need a unique identifier without a central authority.

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ランダムUUID (v4) を一括生成。大文字、ハイフンなし対応。

Count::

UppercaseNo dashes

Click "Generate UUIDs" to create random UUIDs

About UUID v4

UUID (Universally Unique Identifier) v4 generates random 128-bit identifiers. With 122 random bits, the probability of a collision is astronomically low. UUIDs are commonly used as database primary keys, session tokens, and distributed system identifiers.

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How to Use

Set the number of UUIDs to generate (1-20)
Choose options: uppercase, no dashes
Click 'Generate UUIDs'
Click on any UUID to copy, or use 'Copy All'

Common Use Cases

Database primary keys
API resource identifiers
Distributed system identifiers
Session and correlation IDs

UUIDジェネレーター

About UUID v4

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How to Use

Common Use Cases

Frequently Asked Questions