UUID Generator
Generate cryptographically random UUID v4 identifiers instantly — free, browser-based, no signup.
Format
How to generate UUIDs
- Set the number of UUIDs you want (1 to 100) using the slider.
- Choose your preferred format — standard hyphenated, no hyphens, or uppercase.
- Click Generate to create new UUIDs.
- Click any row to copy individual UUIDs, or use Copy All to get them all at once.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. UUID v4 is randomly generated and has an astronomically low probability of collision, making it ideal for database primary keys, session tokens, and distributed systems.
Privacy — generated in your browser
UUIDs are generated using the browser's native crypto.randomUUID() or crypto.getRandomValues() API. Nothing is sent to a server.
Frequently Asked Questions
Are the UUIDs truly unique?
UUID v4 is randomly generated with 122 bits of randomness. The probability of generating the same UUID twice is so small it is effectively impossible for any practical application.
Can I use these as database primary keys?
Yes — UUID v4 is widely used as a primary key in PostgreSQL, MySQL, MongoDB, and other databases.
What is the difference between UUID formats?
Standard format: 550e8400-e29b-41d4-a716-446655440000. No hyphens: 550e8400e29b41d4a716446655440000. Uppercase follows the same format but in capital letters.
What UUID version does this generate?
UUID v4 — randomly generated using the Web Crypto API. This is the most common version for general use.