Générateur UUID / GUID
Générez des identifiants universellement uniques (UUID v4) en un clic.
Génération en lot
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Free UUID Generator Online — Generate v1, v4 and v5 UUIDs
Generate UUID v1, v4 and v5 identifiers in bulk. Copy in one click. Used in databases, APIs, distributed systems and software development. No account.
UUID versions explained: which to use
UUID v4 (random): 122 random bits — the most widely used version. Generated from cryptographically secure randomness with no predictable pattern. Use for: database primary keys, session tokens, file identifiers, event IDs — any case where you need unique IDs without coordination between systems. UUID v1 (time-based): combines the current timestamp (100-nanosecond intervals since Oct 15, 1582) with the machine's MAC address. Sortable by creation time but reveals when and where the UUID was generated — avoid in public-facing contexts. UUID v5 (name-based, SHA-1): deterministically generated from a namespace UUID and a name string. The same name in the same namespace always produces the same UUID. Use for: generating stable IDs for known entities (e.g. UUID for a URL, a username, a product code).
UUID format and structure
All UUIDs have the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx — 8-4-4-4-12 hexadecimal characters, always 36 characters total (32 hex digits + 4 hyphens). The version number is encoded at position 13 (the first character of the third group): v4 UUIDs have "4" there, v1 have "1". The variant bits are encoded at position 17. Example v4 UUID: 550e8400-e29b-41d4-a716-446655440000.
FAQ
Are generated UUIDs truly unique?
UUID v4 uses 122 bits of randomness — the probability of two identical UUIDs being generated is 1 in 5.3 × 10^36. For practical purposes, UUID v4 collisions are impossible.
Can I generate multiple UUIDs at once?
Yes. Select the number of UUIDs to generate (1 to 1000) and copy the entire batch at once.
What format options are available?
Standard with hyphens (550e8400-e29b-41d4-a716-446655440000), without hyphens (550e8400e29b41d4a716446655440000), or uppercase.
Is UUID v4 generated securely?
Yes. We use the browser's cryptographically secure random number generator (CSPRNG) — the same used for cryptographic key generation. The UUIDs are not predictable even if an attacker knows previously generated values.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. They follow the same RFC 4122 standard and are interchangeable. The term UUID is preferred in non-Windows contexts.
Can UUID v1 reveal my IP address or MAC address?
UUID v1 embeds the MAC address of the generating machine. In some implementations, if the MAC address is not available, a random number is substituted. Do not use v1 UUIDs in public-facing contexts if MAC address exposure is a concern.