🆔 UUID Generator
Generate UUIDs (Universally Unique Identifiers) online, supports batch generation, multiple format options, and UUID validation. Pure browser-side processing, data is not uploaded to the server.
💡 Single UUID
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String
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Hex
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Base64
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📋 Batch Results
No batch results yet
Select a quantity and click the "Batch Generate" button
✅ UUID Validator
📗 Generate UUID Code in Various Languages
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 up of 32 hexadecimal characters, grouped by hyphens in a 8-4-4-4-12 pattern for a total of 36 characters.
UUID Characteristics
- Uniqueness — The algorithm makes global uniqueness all but certain, with a near-zero collision probability
- Decentralized — No central authority required; any system can generate one independently
- Standardized — Follows RFC 4122, compatible across languages and platforms
- Fixed format —
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
UUID Versions
| Version | Name | Algorithm | Use case |
|---|---|---|---|
| v1 | Time-based | Timestamp + MAC address | When ordering by time matters |
| v4 | Random | Random numbers (most common) | Generic unique IDs, API keys |
| v7 | Time-ordered | Timestamp + random | High-load databases, distributed systems |
Common Use Cases
- Database primary keys — Avoid auto-increment conflicts across replicas
- Distributed systems — Unique request tracking ids between microservices
- API resource identifiers — Path identifiers in RESTful APIs
- Unique filenames — Rename uploads to avoid name collisions
- Session identifiers — Part of user session tokens
Tip: This tool uses the browser's native
crypto.randomUUID() API (UUID v4), which relies on cryptographically secure randomness and is more reliable than Math.random(). It degrades gracefully to a compatible fallback on browsers that do not support the API.