🆔 UUID Generator
Need unique IDs for database rows, test records or API objects? Generate UUID v4 values in your browser, choose how many you need, adjust letter case, and copy the resulting list.
What Is a UUID?
UUID stands for Universally Unique Identifier. It is a standardized identifier commonly used by software applications to identify records, objects, sessions and other resources.
A UUID is represented as a sequence of hexadecimal characters divided into groups with hyphens.
UUIDs are designed so that independently generated identifiers have an extremely low probability of colliding with one another.
What Is UUID Version 4?
UUID version 4 uses random or pseudorandom values for most of its bits while reserving specific bits to identify the UUID version and variant.
UUID v4 is widely used when an application needs identifiers that can be generated without relying on a central sequential database counter.
How to Generate a UUID
- Choose how many UUIDs you want to generate.
- Select lowercase or uppercase formatting.
- Click the Generate UUID button.
- The generated UUIDs will appear in the result box.
- Use Copy Result to copy them to your clipboard.
Common Uses for UUIDs
- Database record identifiers.
- API resource identifiers.
- Distributed software systems.
- Session and request identifiers.
- File and object identifiers.
- Development and testing data.
Where UUID v4 Values Are Useful
UUID v4 identifiers are commonly used for database records, test fixtures, request IDs, filenames, distributed systems, and other cases where independently generated identifiers are convenient. A value such as 550e8400-e29b-41d4-a716-446655440000 shows the familiar 8-4-4-4-12 UUID layout.
UUID v4 is designed to make accidental collisions extremely unlikely when generated correctly, but “unique” should not be interpreted as a mathematical guarantee. UUIDs are identifiers, not passwords, encryption keys, or proof that a record is trustworthy.
Frequently Asked Questions
What is a UUID v4?
UUID v4 is a 128-bit identifier whose variable portion is generated from random data, with specific version and variant bits set according to the UUID format.
Can I generate multiple UUIDs at once?
Yes. Choose a quantity from 1 to 100 and the tool will generate a list you can copy.
Does the UUID Generator use secure browser randomness?
Yes. It uses crypto.randomUUID when available or browser cryptographic random values as its fallback method.