UUID Generator
Generate random UUIDs (Universally Unique Identifiers) for use in applications and databases.
UUID Version
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Generate UUIDs
Generated UUIDs
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About UUIDs
What is a UUID?
A UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier), is a 128-bit identifier that is guaranteed to be unique across space and time. UUIDs are typically represented as 32 hexadecimal digits, displayed in 5 groups separated by hyphens.
Example: 550e8400-e29b-41d4-a716-446655440000
UUID Versions
UUID v1 (Time-based)
Generated using the current timestamp and the MAC address of the computer. While they’re guaranteed to be unique, they can potentially expose system information.
UUID v4 (Random)
Generated using random numbers. These are the most commonly used UUIDs because they don’t expose any identifying information about your system.
Common Uses for UUIDs
- Database primary keys
- Distributed systems where unique identifiers are needed
- Session identifiers in web applications
- Transaction IDs in financial systems
- File names for uploaded content
- Tracking unique events or entities
Frequently Asked Questions
Are these UUIDs truly unique?
While no algorithm can guarantee 100% uniqueness, the probability of a UUID collision is so low that it’s practically negligible. For UUID v4, the probability of generating a duplicate is about 1 in 2^122 (or 1 in 5,316,911,983,139,663,491,615,228,241,121,378,304).
Which UUID version should I use?
For most applications, UUID v4 (random) is recommended as it provides strong uniqueness guarantees without exposing system information. UUID v1 can be useful when you need sortable IDs or when the timestamp component is beneficial.
Is this generator secure?
Yes, all UUID generation happens directly in your browser using cryptographically secure random number generation when available. Your data never leaves your device or gets sent to our servers.
What’s the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft’s implementation of the UUID standard. For all practical purposes, the terms can be used interchangeably, as they refer to the same 128-bit identifier format.