UUID / GUID Generator
Generate universally unique identifiers (UUID/GUID) instantly. Supports v1, v4, and v5. All processing in your browser—100% private.
100% Private
All UUID generation happens in your browser. No data uploaded.
RFC 4122 Compliant
Generates standard UUIDs compatible with all platforms and databases.
Always Free
Professional UUID generator, completely free. No limits, no sign-up.
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About UUIDs (Universally Unique Identifiers)
What is a UUID?
A UUID is a 128-bit identifier standardized by RFC 4122. It's designed to be unique across space and time, making it perfect for distributed systems where centralized ID generation isn't feasible.
UUID Versions
- v1: Timestamp + MAC address (sortable, traceable)
- v4: Random (most common, 122 random bits)
- v5: SHA-1 hash of namespace + name (deterministic)
Common Use Cases
- Database primary keys
- API request/transaction IDs
- Session identifiers
- File names for cloud storage
- Message queue correlation IDs
UUID Format
UUIDs are typically displayed as 32 hexadecimal digits separated by hyphens:
xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
M = version, N = variant
💡 Tip: For most applications, use UUID v4 (random). It's simple, secure, and widely supported. Use v1 if you need sortable IDs, or v5 if you need deterministic generation.