UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. It's displayed as 32 hexadecimal digits in the format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUIDs are used in databases, distributed systems, and software development to uniquely identify records without central coordination.

What is the difference between UUID v1 and UUID v4?

UUID v1 uses timestamp and MAC address, making it time-ordered but potentially revealing hardware information. UUID v4 uses cryptographic random numbers, providing better privacy and unpredictability. For most applications, UUID v4 is recommended due to its randomness and security properties.

How do I generate multiple UUIDs at once?

Use the bulk generation feature: 1) Select UUID version (v1 or v4), 2) Enter the number of UUIDs you need (1-50), 3) Click Generate. All UUIDs will appear in a list. You can copy them individually or use "Copy All" to copy all UUIDs at once, one per line.

Are the generated UUIDs truly unique?

Yes, UUID v4 uses cryptographic random number generation (crypto.randomUUID()), making collisions astronomically unlikely. The probability of generating duplicate UUID v4 is approximately 1 in 2^122, which is effectively zero for practical purposes.

Is this UUID generator free?

Yes, this UUID generator is completely free with no limitations. Generate unlimited UUIDs, no registration required, and all generation happens in your browser for privacy and speed.

UUID Generator

Generate UUID v1/v4 with bulk generation support

Settings

Select UUID version and count

Version

Count

Results

No UUIDs generated yet

Click Generate to create UUIDs

What is UUID?

UUID v4 (Random)

UUID v4 is randomly generated using cryptographic randomness. Use this for most cases.

UUID v1 (Timestamp)

UUID v1 is timestamp-based and includes the creation time. Can be sorted chronologically.

Tips

• UUID v4 is randomly generated and is the most commonly used

• UUID v1 is timestamp-based and can be used to sort by creation time

• Click on any UUID to copy it to clipboard

• Use 'Copy All' to copy all UUIDs at once (one per line)