UUID / GUID Generator
Generate cryptographically secure random UUIDs (version 4). Create as many as you need and adjust the uppercase and hyphen formatting.
About
A UUID (Universally Unique Identifier) is a 128-bit identifier whose chance of collision is negligible in practice. It is widely used as a unique identifier for database records, distributed systems and API keys.
This tool uses the browser's crypto.randomUUID to produce version 4 (random) UUIDs. You can convert them to uppercase or strip the hyphens. Generation happens entirely on your device.
How to use
- Enter how many UUIDs you want.
- Optionally toggle uppercase and hyphen formatting.
- Use ↻ to regenerate and Copy to grab them all.
What you should know
- Version 4 (random)
- This tool makes v4 UUIDs with 122 bits of randomness; format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
- Collision odds
- Effectively zero in practice; even generating billions, repeats are not expected.
- GUID = UUID
- GUID is the Microsoft name for a UUID; the format and purpose are identical.
- Without hyphens
- Strip the hyphens to use one as a database key or a file name.
Frequently Asked Questions
- Are these UUIDs unique?
- Version 4 UUIDs contain 122 bits of randomness, so the chance of a collision is effectively zero. They are generated from a cryptographically secure source.
- Is there a difference between UUID and GUID?
- In practice they are the same thing. GUID is Microsoft's name for a UUID; the format and purpose are identical.
Other tools
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