UUID v4 Generator
Generate random UUID version 4 values instantly using secure browser cryptographic randomness. Copy with one click.
Generated entirely in your browser. No UUIDs are stored or transmitted.
Common use cases
- Database primary keys (avoiding sequential IDs)
- Temporary identifiers for frontend apps
- API request tracking and correlation IDs
Why use UUIDs?
- Avoid predictable sequential IDs
- Ensure uniqueness across distributed systems
- Safe for public exposure in APIs
UUID v4 values are randomly generated and extremely unlikely to collide.
How it works
This tool generates UUID version 4 values using the browser’s secure cryptographic APIs:
crypto.randomUUID() if available, or crypto.getRandomValues().
- Version: UUID v4 (random-based)
- Format: 8-4-4-4-12 hexadecimal characters
- Source of randomness: cryptographically secure browser APIs
Each UUID contains 122 random bits, making collisions extremely unlikely in real-world systems.
How to interpret: UUIDs are not meaningful values. They are used as unique identifiers for database records, API tokens, and session IDs.
No server-side generation is used. Everything runs locally in your browser.
Examples
- Sample UUID: 550e8400-e29b-41d4-a716-446655440000
- Use UUIDs as database primary keys
- Generate GUIDs for test data or APIs
FAQ
- What is a UUID?
A UUID is a Universally Unique Identifier used to uniquely identify records or resources.
- Is UUID v4 secure?
UUID v4 is random-based and generated from cryptographically secure randomness in modern browsers. It is suitable for most development use cases, but always follow your system’s security requirements.
- Is this the same as a GUID?
Yes. GUID and UUID are commonly used interchangeably.
- Are generated UUIDs stored?
No. Generation happens locally in your browser and nothing is stored or transmitted.
- Can collisions happen?
Collisions are theoretically possible but extremely unlikely because UUID v4 contains 122 random bits.