UUID Generator
Professional UUID generator supporting v4 (random), v1 (timestamp), and v7 (time-ordered) versions. Generate up to 100 unique GUIDs instantly.
Loading tool...
What is UUID Generator?
UUID Generator creates universally unique identifiers (UUIDs/GUIDs) that are guaranteed to be unique across time and space. UUIDs are 128-bit identifiers used in databases, distributed systems, and applications where unique IDs are needed without central coordination.
Key Benefits
- Generate v1, v4, and v7 UUIDs
- Bulk generation (up to 100)
- Copy with one click
- Cryptographically random
Common Use Cases
- •Database primary keys
- •Session identifiers
- •File naming
- •API request tracking
- •Distributed systems
How to Generate UUID/GUID
- Select UUID version: Choose your UUID version: v4 (random, most common), v1 (timestamp-based), or v7 (time-ordered, best for databases).
- Set quantity: Choose how many UUIDs to generate at once—from 1 to 100. Useful for batch operations.
- Generate UUIDs: Click "Generate" to create new UUIDs instantly. Each generation produces completely unique values.
- Copy or export: Click to copy individual UUIDs, copy all at once, or export as a text file for use in your application.
Key Features
- Generate UUID v1, v4, and v7 versions
- Bulk generation up to 100 UUIDs at once
- Copy individual or all UUIDs
- Export as text file
- Validate existing UUIDs
- Cryptographically random for v4
Frequently Asked Questions
What is the difference between UUID v1, v4, and v7?
UUID v1 includes timestamp and MAC address (can reveal information). UUID v4 is completely random—most commonly used. UUID v7 is time-ordered random, combining v1's sortability with v4's randomness, ideal for database primary keys.
Are UUIDs truly unique?
Practically yes. UUID v4 generates 122 random bits, creating 5.3×10³⁶ possible combinations. The probability of collision is astronomically low—you would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.
When should I use UUID vs auto-increment ID?
Use UUIDs for: distributed systems, client-side ID generation, security (hiding sequence), and merging databases. Use auto-increment for: simple applications, ordered data, smaller storage needs (8 bytes vs 16), and human-readable IDs.
Can I use UUIDs as database primary keys?
Yes, but consider UUID v7 for better index performance due to its time-ordered nature. Standard UUID v4 can cause index fragmentation in some databases. Also consider storage size—UUIDs use 16 bytes vs 4-8 bytes for integers.