🆔 Générateur UUID v4 en Ligne — Gratuit et Sécurisé

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.

Guide : Générateur d'UUID

Qu'est-ce que c'est ?

Le Générateur d'UUID produit des identifiants universellement uniques (UUID v4) utilisés comme clés primaires dans les bases de données, les tokens API et les systèmes distribués.

Les UUID v4 sont générés de manière aléatoire et ont une probabilité de collision astronomiquement faible.

Comment utiliser

Cliquez sur Generate pour créer un UUID v4 unique.
Cliquez autant de fois que nécessaire pour en générer plusieurs.
Copiez l'UUID dans votre application ou base de données.

Conseils professionnels

Utilisez UUID v7 (tri chronologique) si la performance de l'index de base de données est importante.
Stockez les UUID comme CHAR(36) ou en binaire (16 octets) selon votre SGBD.