Generate UUIDs Online
Configure your preferences and click the button to generate random UUID version 4 identifiers.
Secure Generation
UUIDs are generated using PHP's cryptographically secure random_bytes() function.
Instant Results
Generate multiple identifiers in seconds without creating an account.
Easy Export
Copy individual UUIDs or download all generated identifiers as a text file.
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier used to distinguish objects, records, resources and entities across different applications and systems.
UUIDs are commonly used in databases, software applications, distributed systems, APIs, cloud platforms and web development.
A standard UUID is represented as 32 hexadecimal characters divided into five groups separated by hyphens.
What Is UUID Version 4?
UUID version 4 is a randomly generated UUID. It uses random data for its identifier, with specific bits reserved to indicate its version and variant.
UUID v4 is particularly useful when applications need identifiers without relying on a central database or coordinated numbering system.
UUID v4 characteristics
- 128-bit identifier.
- 122 random bits.
- Version identifier set to 4.
- RFC 4122 variant bit pattern.
- Suitable for distributed applications.
- Extremely low probability of accidental collision.
UUID Format Explained
A standard UUID contains five groups of hexadecimal characters in the following format:
Each character represents four bits. The number 4 identifies the UUID version, while the variant field identifies the UUID format.
Hexadecimal characters include numbers from 0 to 9 and letters from A to F.
Common Uses of UUIDs
Database primary keys
UUIDs can be used as unique identifiers for database records, users, products and transactions.
API development
Developers use UUIDs to identify API resources, sessions and application objects.
Distributed systems
Independent systems can generate identifiers without requiring a central numbering authority.
Software development
UUIDs are useful for identifying files, processes, application objects and background jobs.
Frequently Asked Questions
1. Is this UUID generator free?
Yes. The SoftRebate UUID generator is completely free to use. You can generate individual UUIDs or multiple identifiers without registration.
2. Are the generated UUIDs unique?
UUID v4 identifiers have an extremely low probability of collision. However, absolute uniqueness cannot be mathematically guaranteed when generating random identifiers.
3. What is the difference between UUID v1 and UUID v4?
UUID v1 is based on a timestamp and node-related information, whereas UUID v4 is generated using random or pseudorandom values. UUID v4 is commonly preferred when a random identifier is required.
4. Can I generate multiple UUIDs?
Yes. You can generate up to 500 UUIDs in a single request and download them as a text file.
5. Can UUIDs be used as database IDs?
Yes. UUIDs are commonly used as database primary keys and identifiers for distributed applications. Database indexing and storage requirements should be considered when choosing UUIDs.
6. Are uppercase and lowercase UUIDs different?
No. Hexadecimal UUIDs are case-insensitive in their standard textual representation. Uppercase and lowercase versions represent the same identifier.
7. Can I generate UUIDs without hyphens?
Yes. Disable the Include hyphens option to generate UUIDs as a continuous string of 32 hexadecimal characters.
8. Is a UUID v4 suitable for passwords?
UUIDs are designed as identifiers, not password-generation systems. Use a dedicated secure password generator for passwords and authentication secrets.
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