550e8400-e29b-41d4-a716-446655440000Click Generate to create UUIDs
UUID Generator
Generate cryptographically random UUID v4 identifiers instantly. Batch generate up to 100, choose from 4 output formats, and copy with one click.
What Is the UUID Generator?
The UUID Generator is a free online tool that creates random version 4 UUIDs using your browser's cryptographic random number generator. UUID v4 identifiers are 128-bit values formatted as 32 hexadecimal digits in 5 groups separated by hyphens, making them virtually unique across space and time.
This UUID Generator runs entirely in your browser. No UUIDs are sent to any server, ensuring your generated identifiers remain private and secure.
UUID Generator Features
- Generate 1 to 100 UUID v4 identifiers in a single batch
- 4 output formats: standard, uppercase, no hyphens, and braces
- Cryptographically secure randomness via Web Crypto API
- One-click copy individual UUIDs or copy all at once
- Live format preview before generating
- Fullscreen mode for distraction-free UUID generation
- 100% client-side UUID Generator — no server, no tracking
How to Use the UUID Generator
Generate UUIDs in seconds:
- Set the number of UUIDs you want to generate
- Choose your preferred output format
- Click Generate to create your UUIDs
- Click the copy icon next to any UUID to copy it, or use Copy All
UUID Generator Use Cases
- Database primary keys — use UUID Generator output as unique row identifiers
- API request IDs and correlation tokens
- Session identifiers and authentication tokens
- File naming for uploads and temporary resources
- Distributed systems requiring unique identifiers without coordination
- Test data generation for development and QA
UUID Generator Output Formats
- Standard: 550e8400-e29b-41d4-a716-446655440000 — the default UUID format
- Uppercase: 550E8400-E29B-41D4-A716-446655440000 — used in some Microsoft APIs
- No Hyphens: 550e8400e29b41d4a716446655440000 — compact format for URLs and filenames
- Braces: {550e8400-e29b-41d4-a716-446655440000} — used in Windows Registry and COM
UUID Generator Security
The UUID Generator uses the Web Crypto API for random number generation, providing cryptographically secure UUIDs suitable for security-sensitive applications. No UUIDs are transmitted to any server.
UUID v4 has 122 bits of randomness, making the probability of collision astronomically small — approximately 1 in 5.3 x 10^36.