🆔 UUID Generator
Generate UUIDs (Universally Unique Identifiers) online with batch generation, format options, multi-format output, and UUID validation. All processing happens client-side in your browser — no data is uploaded to any server.
💡 Single UUID
—
String
—
Hex
—
Base64
—
📋 Batch Results
No batch results yet
Set the count and click "Batch Generate"
✅ UUID Validator
📗 UUID Generation Code by Language
JavaScript
crypto.randomUUID()
Python
import uuid\nuuid.uuid4()
Java
import java.util.UUID;\nUUID.randomUUID()
Dart
import 'package:uuid/uuid.dart';\nvar uuid = Uuid();\nuuid.v4()
C#
Guid.NewGuid()
SQL
SELECT UUID()
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. A UUID is made of 32 hexadecimal characters grouped as 8-4-4-4-12 separated by hyphens, totaling 36 characters.
UUID Characteristics
- Uniqueness — UUID algorithms guarantee global uniqueness in practice, with a near-zero probability of collision
- Decentralized — No central authority required; any system can generate UUIDs independently
- Standardized — Follows RFC 4122, with implementations that are interoperable across languages and platforms
- Fixed Format —
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
UUID Versions
| Version | Name | Algorithm | Use Cases |
|---|---|---|---|
| v1 | Time-based | Timestamp + MAC Address | Scenarios requiring time-based ordering |
| v4 | Random UUID | Random numbers (most common) | General unique IDs, API keys, database PKs |
| v7 | Time-ordered | Timestamp + Random | High-load databases, distributed systems |
Common Use Cases
- Database Primary Keys — Avoid auto-increment ID conflicts across distributed databases
- Distributed Systems — Unique request tracing IDs across microservices
- API Resource Identifiers — Path identifiers in RESTful APIs
- Unique File Names — Rename uploaded files with UUIDs to prevent collisions
- Session Identifiers — Components of user session tokens
Note: This tool uses the browser's native
crypto.randomUUID() API (UUID v4) with cryptographically secure random numbers — more reliable than Math.random(). In browsers that don't support this API, it automatically falls back to a compatibility polyfill.