- Select the UUID version you need: v4 (random, most common), v1 (time-based), or Nil (all zeros)
- Set the quantity of UUIDs to generate (1 to 1000)
- Choose format options: uppercase, remove dashes, or add braces as needed
- Click 'Generate UUID' button to create your UUIDs instantly
- Copy individual UUIDs or all at once, or download as a text file
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are essential for distributed systems, database primary keys, session IDs, and microservice architectures where unique identification without central coordination is required.
Is UUID Generator free to use?
Yes, this UUID Generator is completely free to use with no registration required. You can generate unlimited UUIDs in any version (v1, v4, Nil) and bulk generate up to 1000 UUIDs at once. All features including format options and downloads are available at no cost.
What is the difference between UUID v1 and v4?
UUID v1 is time-based, containing a timestamp and MAC address, making it sortable by creation time. UUID v4 is completely random, offering better privacy as it reveals no creation information. For most applications, UUID v4 is recommended for its simplicity and privacy benefits.
Are UUIDs truly unique?
Yes, for all practical purposes UUIDs are unique. The probability of generating duplicate UUID v4s is astronomically low (about 1 in 2^122). With approximately 5.3 x 10^36 possible combinations, collisions are virtually impossible in real-world applications.
What is a Nil UUID used for?
A Nil UUID (00000000-0000-0000-0000-000000000000) is a special UUID with all bits set to zero. It serves as a placeholder, default value, or represents 'no value' in systems requiring UUID format but needing to indicate absence of a real identifier.
Is it safe to use this UUID generator?
Yes, completely safe. All UUID generation happens entirely in your browser using JavaScript with no data transmitted to any server. Your generated UUIDs remain completely private and secure on your device.
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