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UUID Generator – v1 & v4 Unique IDs Online Free
NewGenerate UUID v1 (timestamp-based) and v4 (random) identifiers instantly. Bulk generate up to 100 UUIDs with format options — no server required.
UUID Generator
No UUIDs yet
Configure your settings on the left and hit Generate.
What is UUID Generator?
Generate cryptographically secure UUIDs in v1 (timestamp-based) and v4 (random) formats. Options for uppercase, no hyphens, braces, and URN format. Bulk generate up to 100 at once.
UUID Generator Features
v1 & v4 Formats
Timestamp-based (sortable) or fully random UUIDs.
Bulk Generation
Generate and copy up to 100 UUIDs at once.
Output Options
Uppercase, no hyphens, braces, or URN format.
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UUID Generator FAQ
v1 is timestamp-based and sortable (useful for time-ordered databases). v4 is fully random — the standard choice for most applications.
v4 UUIDs are 122 bits of randomness. The probability of a collision across all UUIDs ever generated is astronomically small — effectively unique for any real-world application.
They are the same thing. GUID (Globally Unique Identifier) is Microsoft's terminology; UUID (Universally Unique Identifier) is the RFC 4122 standard name.
Use v1 when you need time-sortable IDs for database indexing (e.g., Cassandra, ScyllaDB). Use v4 for everything else — it is the most widely adopted and has no timestamp leakage.