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UUID Generator

Generate universally unique identifiers (UUID/GUID) instantly. Create version 4 random UUIDs in bulk with customizable formatting options.

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Version 4 UUIDs are randomly generated and have 2122 possible combinations, making collisions extremely unlikely.
UUID Version
Count (1-100)
Format Options
Generated UUIDs
Click Generate to create UUIDs
🛈 Privacy Note: All UUIDs are generated locally in your browser using the Web Crypto API for cryptographically secure random values. No data is sent to any server.

About UUID Generator

Generate RFC 4122 compliant version 4 UUIDs (Universally Unique Identifiers) instantly. UUIDs are 128-bit identifiers that are virtually guaranteed to be unique across all systems. They're widely used in databases, APIs, distributed systems, and anywhere a unique identifier is needed.

How to Use

  1. Set the Count (1-100) to generate multiple UUIDs at once.
  2. Choose format options: UPPERCASE or Remove hyphens.
  3. Click Generate UUID(s) to create your identifiers.
  4. Click the copy icon next to any UUID to copy it individually.
  5. Use Copy All to copy all generated UUIDs to your clipboard.
  6. Use Download TXT to save UUIDs as a text file.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It's represented as 32 hexadecimal digits displayed in five groups separated by hyphens (8-4-4-4-12 format). UUIDs are designed to have an extremely low probability of collision.

What is UUID version 4?

Version 4 UUIDs are randomly generated. They contain 122 random bits (6 bits are fixed to indicate version and variant), providing 2122 possible combinations. This means the chance of generating the same UUID twice is astronomically small - effectively zero for practical purposes.

When should I use UUIDs?

UUIDs are ideal when you need unique identifiers without a central authority to coordinate ID allocation. Common use cases include: database primary keys, API resource identifiers, session tokens, file names, message IDs in distributed systems, and transaction IDs.

Are UUIDs secure for tokens?

UUIDv4 provides 122 bits of randomness, which is suitable for many token use cases. However, for high-security applications like session tokens or authentication codes, you may want to use additional security measures or consider dedicated token generation libraries.

Can UUIDs collide?

Theoretically yes, but practically no. With 2122 possible UUIDv4 values, you would need to generate about 1 billion UUIDs per second for 100 years to have a 50% chance of a single collision. For all practical purposes, UUIDs can be considered unique.