Desenvolvimento
ID
Programming
UUID Generator
v4 identifiers
Generate a universally unique identifier (UUID v4) in one click and use it directly in code, databases, APIs, or any system that needs unique IDs. UUID v4 uses cryptographic randomness, making collisions practically impossible.
How to use
- 1Select the desired UUID version from the menu (v4 is the most common for general use).
- 2Click 'Generate' to create a new random identifier instantly.
- 3Use the 'Copy' button to paste the UUID directly into your code, database, or API.
- 4Click 'Generate' again whenever you need a new unique identifier.
Practical examples
Seed a test table
Generate several UUIDs in sequence to use as primary keys in test data, with no risk of collision.
Identify user sessions
Use a UUID v4 as a unique session token — its randomness makes repeating a value virtually impossible.
Name uploaded files without conflicts
When uploading files, use a UUID as the file name to prevent two different files from overwriting each other.
Frequently asked questions
What is UUID v4?
UUID v4 is a 128-bit randomly generated identifier in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. It is the most common type for general use in distributed systems.
What are the odds of two UUIDs being identical?
The probability of collision is astronomically low — approximately 1 in 5.3 × 10³⁶. In practice, it is considered impossible for common applications.
Can I generate multiple UUIDs at once?
Yes, the tool allows you to generate several UUIDs in sequence for bulk use, such as populating database tables in tests.