UUID v4 Generator

Free online UUID v4 and GUID generator. Generate RFC 4122 compliant unique identifiers instantly — one at a time or in bulk up to 100. No signup required.

Generated UUID

Number of UUIDs: 1

UUID v4 (random) - Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

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What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier standardized by RFC 4122. UUID v4 is randomly generated, making collisions virtually impossible. They are widely used in databases, APIs, distributed systems, and software development to uniquely identify records, sessions, files, and more without a central authority.

Features

UUID v4 (Random)

Generates RFC 4122 compliant version 4 UUIDs using cryptographically random values. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.

Bulk Generation

Generate up to 100 unique identifiers in one click. Each UUID is independently random with no repeats.

GUID Compatible

UUID v4 is fully compatible with the GUID format used in Microsoft and .NET environments.

One-click Copy

Copy a single UUID or the entire bulk list to your clipboard instantly.

Frequently Asked Questions

What is the difference between UUID and GUID?

UUID and GUID refer to the same concept. UUID is the formal RFC 4122 standard term, while GUID (Globally Unique Identifier) is the term Microsoft uses. Both follow the same 8-4-4-4-12 hexadecimal format.

Is UUID v4 truly unique?

UUID v4 uses 122 random bits, giving 2^122 possible values. The probability of generating two identical UUIDs is astronomically small — effectively zero for any practical application.

What is UUID v4 used for?

UUID v4 is used as primary keys in databases, unique tokens in APIs, session identifiers, file names, and anywhere a unique identifier is needed across distributed systems without coordination.

Are the generated UUIDs stored anywhere?

No. All UUIDs are generated entirely in your browser using the Web Crypto API. Nothing is sent to or stored on any server.

Can I generate multiple UUIDs at once?

Yes. Set the count between 1 and 100 and click Generate. All UUIDs are generated at once and can be copied as a newline-separated list.