UUID Generator

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UppercaseInclude hyphensWrap in braces {}

Generated UUIDs

0 UUIDs

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Format Preview

Standard:a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d

Uppercase:A1B2C3D4-E5F6-4A7B-8C9D-0E1F2A3B4C5D

No hyphens:a1b2c3d4e5f64a7b8c9d0e1f2a3b4c5d

With braces:{a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d}

UUID v4 Structure

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

4 - Version indicator (v4)

y - Variant indicator (8, 9, a, or b)

UUID Version Comparison

Version	Generation	Use Case
v1	Timestamp + MAC address	Sortable by time, database records
v4Recommended	Random numbers	General purpose, most common
v5	SHA-1 hash of namespace + name	Deterministic, same input = same UUID
v7	Unix timestamp + random	Sortable, modern alternative to v1

About UUID

UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUID v4 uses random numbers and has a collision probability of about 1 in 5.3 billion per UUID generated. They are commonly used for database primary keys, session IDs, and distributed system identifiers.