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How to Use UUID Generator: Complete Guide (2026)
Learn how to use uuid generator free online — no signup, no download. Follow our step-by-step guide below.
What is UUID Generator?
Generate RFC-4122 compliant UUIDs (v4, random) in bulk. Features multiple output formats (with/without hyphens, uppercase/lowercase), and batch generation (up to 100 at once). Uses cryptographic randomness. Essential for database primary keys, distributed system IDs, and API resource identifiers.
- 100% browser-based — no data uploaded to servers
- Free to use — no signup required
- Instant results — no waiting
- Works on all devices — mobile, tablet, desktop
How to Use UUID Generator: Step-by-Step
- 1
Choose UUID version
Select UUID v4 (random) — the most commonly used version.
- 2
Set batch size
Choose how many UUIDs to generate (1-100).
- 3
Choose format
Toggle hyphens on/off, and uppercase/lowercase hex digits.
- 4
Generate and copy
Click Generate. Copy individual UUIDs or all at once.
Common Use Cases
Database primary keys
Generate unique IDs for distributed databases where auto-increment is not feasible.
API resource IDs
Assign unique identifiers to API resources (users, orders, products) in microservices.
Test data generation
Generate unique IDs for test fixtures and mock data.
FAQ About UUID Generator
What is the collision probability of UUID v4?
Extremely low. With 122 random bits, you need to generate 2^61 UUIDs before a collision becomes likely. Practically zero for most applications.
Should I use UUID v4 or v7?
v4 is random (no time info). v7 includes a timestamp, making it sortable by creation time. v7 is better for database indexing.
Is this compliant with RFC 4122?
Yes. UUIDs generated follow RFC 4122 v4 format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where y is 8, 9, a, or b.
Ready to Try UUID Generator?
No signup. No download. 100% free.