UUID Generator
Generate cryptographically random UUID v4 values in your browser.
Generated UUIDs
Click Generate to create UUIDs
UUID v4 Generator
Generate one or up to 50 RFC 4122 compliant UUID v4 values in a single click. The tool uses the browser's native crypto.randomUUID() API for cryptographically secure random generation. Copy individual UUIDs or all at once.
Frequently Asked Questions
- What is a UUID?
- A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. The standard format is eight groups of hexadecimal digits separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
- What is UUID v4?
- UUID v4 is randomly generated. All 128 bits are random (except for a few version/variant bits), making the probability of collision astronomically small — about 1 in 5.3 × 10³⁶ for any two v4 UUIDs.
- Are these UUIDs cryptographically random?
- Yes. This tool uses the browser's built-in crypto.randomUUID() API, which uses a cryptographically secure pseudo-random number generator (CSPRNG).
- What is the difference between UUID and GUID?
- GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical — UUID is the formal standard, GUID is the Microsoft-branded term.
- Can I use these UUIDs in a database?
- Yes. UUID v4 values are suitable as primary keys, foreign keys, or any other identifier in databases like PostgreSQL, MySQL, MongoDB, or SQLite. Many databases have a native UUID type.