Private UUID v4 generator

UUID Generator

Generate secure random UUID version 4 identifiers one at a time or in a batch, then copy individual values or the list.

UUIDs are generated in your browser. No values are sent or stored.

What is a UUID?

A universally unique identifier is a 128-bit value written as 32 hexadecimal characters separated into five groups. UUIDs let independent systems create identifiers without asking a central service for the next number.

How UUID version 4 works

Version 4 UUIDs use random bits, with a small number reserved to identify the UUID version and variant. This leaves 122 random bits, making accidental collisions extremely unlikely when values come from a cryptographically secure random source.

Common UUID uses

UUIDs are widely used for database records, API resources, event IDs, distributed jobs, test data, filenames, request tracing, and client-generated records that may be synchronized later. Their fixed format also makes them easy to recognize and validate across programming languages.

UUIDs are identifiers, not secrets

A UUID v4 is difficult to guess but should not replace authentication, authorization, or a purpose-built security token. Treat UUIDs as identifiers that may become visible in URLs, logs, or application data.

Frequently Asked Questions

No finite random identifier can offer an absolute guarantee, but secure 122-bit randomness makes accidental collisions extraordinarily unlikely.

The limit keeps the page responsive and makes accidental oversized batches less likely.

No. UUIDs are identifiers, not credentials. Use a security-token format designed for authentication or authorization.

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