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UUID Generator

What is UUID Generator? (Quick Answer)

Generate UUID/GUID Free online tool, no registration required, 100% client-side processing.

Generate UUID/GUID

By Craftisle Team

About UUID Generator — Free Online Tool

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.

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.

Use Cases for UUID Generator

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 — UUID Generator Free Online Tool

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.

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