UUID Generator
Generate random UUIDs (v4) for databases, APIs, and applications. Cryptographically secure using Web Crypto API.
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Click generate to create UUIDs
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. Also known as GUID (Globally Unique Identifier), UUIDs are used to identify information without requiring a central authority.
UUID Format
A standard UUID looks like: 550e8400-e29b-41d4-a716-446655440000
It consists of 32 hexadecimal digits displayed in 5 groups separated by hyphens (8-4-4-4-12).
UUID Versions
- UUID v1 — Based on timestamp and MAC address
- UUID v4 — Random (this tool generates v4)
- UUID v5 — Name-based using SHA-1 hash
- UUID v7 — Time-ordered for database performance
Common Use Cases
- Database Primary Keys — Unique IDs without auto-increment
- API Request IDs — Track requests across services
- Session Tokens — Unique session identifiers
- File Names — Avoid naming collisions