What's the difference between UUID v1 and v4?

UUID v1 includes timestamp and MAC address information (less random but sortable). UUID v4 is completely random and is recommended for most use cases due to better privacy and unpredictability.

Are these UUIDs truly unique?

UUID v4 has 122 bits of randomness, making collisions astronomically unlikely (1 in 5.3 × 10³⁶). For practical purposes, they're guaranteed to be unique.

UUID Generator

Popular

Generate unique UUIDs/GUIDs instantly

What is UUID Generator?

Our UUID Generator creates universally unique identifiers (UUIDs) that are guaranteed to be unique across space and time. Supporting UUID versions 1, 4, and 5, this tool is essential for generating database keys, API identifiers, session tokens, and any application requiring unique IDs. UUIDs are 128-bit values displayed as 32 hexadecimal characters with hyphens.

Common Use Cases

Generating database primary keys
Creating unique API request identifiers
Session token generation
File naming for unique identification
Distributed system coordination
Testing UUID-based applications
Creating correlation IDs for logging

Key Benefits

Cryptographically secure UUID v4

Timestamp-based UUID v1

Name-based UUID v5

Bulk generation (up to 1000 UUIDs)

Multiple format options

Copy individual or all UUIDs

No server required - fully local

How to Use UUID Generator

Select the UUID version you need (v4 is most common for random UUIDs), choose how many to generate, and click generate. Copy UUIDs individually or export all at once.

Frequently Asked Questions

Related Tools You Might Like

If you found UUID Generator useful, try these similar tools:

Hash Generator

Generate MD5, SHA1, SHA256, SHA512 hashes

Try Hash Generator →

Password Generator

Generate secure random passwords

Try Password Generator →

Random String Generator

Generate secure random strings with custom options

Try Random String Generator →

Random Number Generator

Generate random numbers

Try Random Number Generator →

UUID Generator

Popular

Generate unique UUIDs/GUIDs instantly

Single UUID

Generate a single UUID v4

Bulk Generator

Generate multiple UUIDs at once

Count

How to Use

1. For a single UUID, click the refresh icon or copy the displayed UUID

2. For multiple UUIDs, enter the count (1-100) and click Generate

3. Copy individual UUIDs or use "Copy All" for bulk copy

4. UUIDs are RFC 4122 compliant v4 (random) identifiers