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UUID v4 Generator
Generate random UUID v4 strings.
UUID v4 Generator
Generate random UUID v4 strings instantly.
How many UUIDs?
What is UUID v4 Generator?
UUID v4 Generator produces a unique identifier string 36 characters long.
How Does It Work?
The tool uses the Web Crypto API (crypto.getRandomValues()) to generate 16 random bytes according to RFC 4122.
Common Use Cases
- Database primary keys - A unique ID that's safe to share publicly.
- Session & token IDs - A session identifier that can't be guessed.
- Distributed systems - Generate unique IDs across many servers.
- File naming - Avoid file name collisions on upload.
- Testing & mocking - Dummy data with valid UUIDs.
Frequently Asked Questions
Q: Is a UUID v4 truly unique?
A: Yes, the chance of a collision is 1 in 2.7 quintillion.
Q: What's the difference between UUID v1 and v4?
A: UUID v1 uses a timestamp and MAC address. UUID v4 is fully random.
Q: Can it be used as an API key?
A: It can, but a UUID has no checksum or signature for authentication.