UUID Generator

Key takeaways

• UUID v4 via crypto.randomUUID when available
• Bulk generate up to 100 IDs
• Optional uppercase and hyphenless output
• Fully client-side

What is a UUID v4?

UUID version 4 is a 128-bit identifier with random bits (and a fixed version/variant nibble), usually shown as 8-4-4-4-12 hexadecimal groups.

Collision risk is negligible for normal volumes. This tool does not generate time-ordered UUID v7. Use uppercase or hyphenless options when your storage format requires them.

Features

• UUID v4

  Cryptographically strong random UUIDs via crypto.randomUUID when available.

• Bulk generate

  Create up to 100 identifiers in one click for fixtures and seeds.

• Format options

  Toggle uppercase and remove hyphens for compact storage keys.

• Copy & download

  Export a newline-separated list for scripts and spreadsheets.

How it works

1. 1

   Choose options

   Set count, uppercase, and hyphen preferences.

2. 2

   Generate

   Click Generate to mint new UUIDs in the output panel.

3. 3

   Copy the list

   Copy or download for use in code, SQL, or config files.

Example walkthroughs

• Single UUID

  Generate one v4 UUID (count is controlled in the panel).

  1

• Bulk fixture set

  Mint several IDs at once for seed data — toggle uppercase or hyphenless in the panel as needed.

  5

Use cases

• Database seeds

  Mint primary keys for local fixtures and migration scripts.

• Client-side IDs

  Create request or correlation IDs before an API responds.

• Test data

  Fill forms and mocks with unique identifiers quickly.

Code snippets

• UUID v4 in modern browsers

  js

  This generator uses crypto.randomUUID when available.

  const id = crypto.randomUUID();
  // → "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx"

Common errors

• Count rejected

  Cause: Count was outside 1–100 or not an integer.

  Fix: Choose a whole number between 1 and 100 inclusive.

• Need time-ordered IDs

  Cause: This tool only generates UUID version 4.

  Fix: Use a UUID v7 library if sortable IDs are required.

About UUID Generator

El Generador UUID crea UUID versión 4 con la Web Crypto API para acuñar identificadores de bases de datos, tests y APIs sin un viaje de ida y vuelta al servidor. Genera un ID o hasta cien en un clic para fixtures y scripts de seed.

Las opciones de mayúsculas y sin guiones coinciden con convenciones de almacenamiento que prefieren claves compactas o el casing legacy de GUID. El riesgo de colisión en v4 es despreciable a volúmenes normales; esta herramienta no genera UUID v7 ordenados por tiempo si necesitas IDs ordenables.

La generación es totalmente en el cliente. Nada se envía a un servidor, lo que mantiene demos offline y flujos air-gapped. Descarga una lista separada por saltos de línea cuando necesites pegar en SQL, CSV o herramientas de scaffolding.

Buena práctica: prefiere v4 respaldado por crypto.randomUUID para IDs públicos nuevos; no trates los UUID como secretos. Usa el Generador de Hash cuando necesites un digest del contenido en lugar de un identificador aleatorio, y Decodificar JWT cuando la cadena que inspeccionas sea un token — no un UUID.

Frequently asked questions

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