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UUID 생성기

RFC 4122

RFC 4122 v4 및 시간 순서 v7 UUID를 일괄 생성하고 대문자·하이픈 제거 형식을 지원합니다.

Web Crypto · RFC 4122/9562

랜덤 122비트 값(RFC 4122), 대부분의 식별자에 적합.

결과

생성된 UUID 없음

UUID 생성을 클릭하여 식별자 생성

About

About UUID Generator

Choose a version and a count, and the generator produces a batch of UUIDs instantly. Version 4 UUIDs are built from 122 random bits, which makes them ideal for general-purpose identifiers. Version 7 UUIDs embed a millisecond timestamp, so they are time-ordered, sortable, and friendlier to database indexes.

Formatting options let you output uppercase values or remove dashes for compact 32-character keys. Copy individual values or the whole batch with one click - nothing leaves your device.

UUIDs are generated with the browser's cryptographically secure random number generator, so collisions are astronomically unlikely and the output is unpredictable.

기능 & 하이라이트

  • RFC 4122 version 4 UUIDs (random)
  • RFC 9562 version 7 UUIDs (time-ordered)
Bulk generation up to 100 at once
  • Uppercase and dash-free formatting
  • One-click copy per value or entire batch
  • 100% client-side with Web Crypto randomness
    • FAQ

    UUID Generator FAQ

    Find answers to common questions about generating UUIDs, choosing a version, and formatting output.

    What is the difference between UUID v4 and v7?

    Version 4 UUIDs are entirely random (122 random bits), which makes them unpredictable and ideal for most identifiers. Version 7 UUIDs embed the current millisecond timestamp followed by random bits, so they increase over time and sort naturally - a better fit for database primary keys and log ordering.

    Can two generated UUIDs collide?

    Practically never. Version 4 offers 122 random bits (about 5.3 x 10^36 possibilities), and the browser's CSPRNG is the same source used for TLS keys. Generating billions of UUIDs per second for centuries would still make a collision unlikely.

    Should I use v4 or v7 for my database primary keys?

    For large tables, v7 is usually the better choice because time-ordered values reduce index fragmentation and keep inserts near the end of the index. For client-generated keys where order does not matter, v4 is fine.

    What do the formatting options do?

    Uppercase outputs the UUID in capital letters. Remove dashes strips the hyphens to produce a compact 32-character hexadecimal string, useful for tokens or constrained storage fields.

    Is a GUID the same as a UUID?

    Effectively yes for this tool. GUID is Microsoft's name for UUIDs. This generator follows RFC 4122 and RFC 9562, which are the canonical specifications used across most platforms.

    Is my data sent anywhere?

    No. All UUIDs are generated locally in your browser with Web Crypto. Nothing is transmitted, logged, or stored.