UUID Generator
SecurityGenerate RFC-compliant UUIDs instantly. Choose UUID v1 (time-based), v4 (random), v5 (name-based SHA-1), or v7 (time-sorted). Bulk generate and copy with one click.
No UUIDs yet
Choose a version and format, then click Generate to create unique identifiers.
v4 · randomv7 · time-orderedup to 200 at once
About UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in distributed systems without requiring a central registration authority. This tool generates fully RFC 4122-compliant UUIDs across all major versions, making it ideal for developers who need unique keys for databases, APIs, or distributed applications.
Features
- ✓Generate UUID v1 (time + MAC address based)
- ✓Generate UUID v4 (cryptographically random)
- ✓Generate UUID v5 (name-based using SHA-1 hash)
- ✓Generate UUID v7 (time-sorted, monotonic)
- ✓Bulk generation — produce hundreds of UUIDs at once
- ✓One-click copy to clipboard
- ✓Uppercase/lowercase formatting toggle
- ✓Hyphens optional formatting
Common Use Cases
- Primary keys for database records in PostgreSQL, MySQL, or MongoDB
- Correlation IDs for distributed tracing and logging
- Unique resource identifiers in REST APIs
- Session tokens and nonce values
- Idempotency keys for payment or messaging systems
Frequently Asked Questions
QWhat is the difference between UUID v4 and v7?
UUID v4 is completely random, making it unordered in databases. UUID v7 encodes a millisecond-precision Unix timestamp in the high bits, producing lexicographically sortable identifiers—ideal for indexed database columns.
QAre generated UUIDs truly unique?
UUID v4 has 122 bits of randomness. The probability of collision among 1 trillion UUIDs is roughly 1 in a billion—effectively unique for all practical purposes.
QIs UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's term for the same 128-bit UUID standard defined in RFC 4122.