UUID Generator
Generate cryptographically secure UUID v4 values instantly. Single or bulk generation, copy, download, and validate — all in your browser.
🔒 Generated locally using crypto.randomUUID(). No data sent to any server.
UUID Format Examples
| Format | Example | Use Case |
|---|---|---|
| Standard (lowercase) | 550e8400-e29b-41d4-a716-446655440000 | RFC 4122 default |
| Uppercase | 550E8400-E29B-41D4-A716-446655440000 | Windows / Microsoft APIs |
| No hyphens (lowercase) | 550e8400e29b41d4a716446655440000 | URL-safe, compact storage |
| No hyphens (uppercase) | 550E8400E29B41D4A716446655440000 | Legacy systems |
| Braced | {550e8400-e29b-41d4-a716-446655440000} | Windows Registry |
| URN | urn:uuid:550e8400-e29b-41d4-a716-446655440000 | XML / SOAP services |
About UUIDs
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify resources in distributed systems. The most common version, UUID v4, uses cryptographically secure random numbers to ensure uniqueness without coordination between systems.
UUID v4 vs v7
UUID v4 is purely random — ideal when you need no correlation between identifiers. UUID v7 (defined in RFC 9562) embeds a timestamp, making IDs time-sortable. This is advantageous for database indexes where insertion order matters for performance.
Common Use Cases
Database primary keys, API request tracing, session identifiers, file naming, message queue deduplication, and distributed system coordination. UUIDs eliminate the need for a centralized ID authority.
Security Note
This tool uses the Web Crypto API (crypto.randomUUID()) which provides cryptographically secure random values suitable for security-sensitive applications. Everything runs locally — no network requests are made.