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
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you generate unique identifiers for systems and databases. It runs entirely in your browser without sending data to a server.
You can use this tool when creating IDs for records, sessions, or API requests. The results should be interpreted as a randomly generated UUID with extremely low collision probability.
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.