🆔 Generador UUID v4 Online — Gratis y Seguro

Generate cryptographically secure UUID v4 and ULID identifiers. Bulk generate up to 20 at once. No signup, no server — runs in your browser.

Click Generate for an instant cryptographically secure UUID v4, or switch to ULID for a sortable identifier. Generate 1–20 at once and copy individually or all at once. Everything runs in your browser using the Web Crypto API — no server, no logging.

Type

Count

Uppercase

How to Use

Choose type and count

Select UUID v4 or ULID from the type selector, then set the count (1–20).

Click Generate

Press Generate to instantly create cryptographically secure identifiers.

Copy your IDs

Click the Copy button next to any ID, or use Copy All to copy the entire list.

Frequently Asked Questions

What is a UUID? +

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in software. UUID v4 is randomly generated, producing IDs like "550e8400-e29b-41d4-a716-446655440000". The probability of collision is astronomically low.

What is the difference between UUID v4 and other UUID versions? +

UUID v1 is based on time and MAC address. UUID v3 and v5 are name-based using MD5/SHA-1 hashes. UUID v4 is fully random and is the most commonly used version for databases and distributed systems.

What is a ULID? +

ULID (Universally Unique Lexicographically Sortable Identifier) is an alternative to UUID that is sortable by creation time. It is 26 characters in Crockford Base32. The first 10 characters encode millisecond timestamp, the remaining 16 are random.

Are generated UUIDs truly unique? +

UUID v4 uses cryptographic randomness (crypto.getRandomValues). The probability of generating a duplicate UUID is 1 in 5.3×10^36 — effectively zero for all practical purposes.

Is any data sent to a server? +

No. UUIDs and ULIDs are generated entirely in your browser using the Web Crypto API. Nothing is sent to any server.

Guía: Generador de UUID/GUID

¿Qué es?

Un UUID es un identificador de 128 bits formateado como xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUID v4 usa aleatoriedad criptográfica — la probabilidad de colisión es astronómicamente pequeña.

Preferibles a IDs enteros secuenciales para sistemas distribuidos y para no exponer información de secuencia en APIs públicas.

Cómo usar

Selecciona la versión: v4 (aleatorio) es el más común.
Elige la cantidad a generar en lote.
Haz clic en Generar y copia los UUIDs.

Consejos

Usa v4 por defecto; v7 (timestamp-first) si necesitas ordenación temporal.
En PostgreSQL, el tipo nativo uuid es más eficiente que VARCHAR.
Para URLs públicas, considera IDs más cortos (nanoid, ULID) que UUIDs completos.