UUID Generator
Generate up to 50 UUID v4 values at once with format options for hyphens and case
Click Generate to create UUIDs
About UUID Generator
UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUID v4 uses random numbers to generate identifiers with near-zero probability of collision. They are widely used in databases, APIs, session tokens, and distributed systems. This generator uses the browser's built-in crypto.randomUUID() for cryptographic randomness.
FAQ
- What is the difference between UUID v1 and v4?
- UUID v1 is time-based and includes the MAC address of the generating machine, making it traceable. UUID v4 is fully random, making it privacy-friendly and widely preferred for most use cases.
- Can two UUIDs ever be the same?
- The probability is astronomically small — approximately 1 in 5.3 × 10^36. In practice, UUID v4 collisions are considered impossible for any real-world use case.
- What is the difference between UUID with and without hyphens?
- They represent the same value. UUIDs are commonly written with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000) for readability, but some systems store them without hyphens to save space.
Related Tools
QR Code Generator
Generate QR codes from URLs or text with custom size, colors, and optional logo
Password Generator
Generate strong secure passwords with custom length and character options
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes online for free
Random Number Generator
Generate random numbers online. Set min, max, and count with unique number support