Бесплатный генератор UUID онлайн
Generate random UUID v4 values instantly.
Quick Generate
Bulk Generate
About UUIDs
A UUID (Universally Unique Identifier) is a 128-bit identifier designed to be unique across space and time. The most common version, UUID v4, is generated using random or pseudo-random numbers. The format is 8-4-4-4-12 hexadecimal characters, e.g. 550e8400-e29b-41d4-a716-446655440000.
This tool uses crypto.getRandomValues() for cryptographically secure random generation. The version nibble is set to 4 and the variant bits are set to 10, per RFC 4122. All processing happens in your browser.
Common Uses
- Database primary keys and record identifiers
- API request IDs and correlation tokens
- Session tokens and temporary file names
- Distributed system node identifiers
- Test data generation for software development
- Unique filenames to avoid collisions
Frequently Asked Questions
What is the difference between UUID and GUID?
They are essentially the same thing. UUID is the standard term (RFC 4122), while GUID (Globally Unique Identifier) is the Microsoft terminology. Both refer to a 128-bit identifier in the same 8-4-4-4-12 hex format.
Can two UUIDs ever be the same?
Theoretically yes, but the probability is astronomically low. UUID v4 has 122 random bits, giving about 5.3 × 10³⁶ possible values. You would need to generate billions of UUIDs per second for decades to have a 50% chance of a single collision.
Are these UUIDs cryptographically secure?
Yes. This generator uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically strong random values. The output is suitable for security-sensitive use cases like session tokens.