Generate UUID v4 (random) universally unique identifiers online for free. Generate single or bulk UUIDs instantly with one click.
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Choose how many UUIDs to generate (1–100).
Select format: standard, no hyphens, or uppercase.
Generate and copy UUIDs to clipboard.
Cryptographically random UUID generation.
Generate up to 100 UUIDs at once.
With/without hyphens, uppercase/lowercase.
Copy single or all UUIDs with one click.
UUID (Universally Unique Identifier) is a 128-bit identifier that is practically guaranteed to be unique across all systems.
UUID v4 is randomly generated. It's the most commonly used version for general-purpose unique IDs.
The probability is astronomically low (1 in 5.3×10^36), making collisions virtually impossible in practice.
UUIDs are typically lowercase but are case-insensitive. Both representations refer to the same identifier.
GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are functionally identical.
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