UUID Generator
Generate UUID v4 (random). Supports bulk generation, format options, and UUID validation.
Generate UUID
Generate UUID ボタンをクリックしてUUIDを生成
Analyze UUID
Valid UUID?
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Version
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Variant
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How to Use
1
Select Quantity and Format
Choose how many UUIDs you need (1-100) and the format.
2
Click Generate
UUIDs are generated instantly.
3
Copy and Use
Copy individually or use "Copy All" for bulk copy.
What is UUID
UUID (Universally Unique Identifier) is a 128-bit unique identifier. Also known as GUID (Globally Unique Identifier). Used for database primary keys, session IDs, API tokens, and any scenario requiring non-duplicating identifiers.
Features
- UUID v4 GenerationGenerate UUIDs using cryptographically secure random numbers
- Bulk GenerationGenerate up to 100 UUIDs at once
- Format OptionsChoose uppercase/lowercase, with/without hyphens
- UUID ValidationAnalyze and identify UUID version
Use Cases
- Database primary keys
- API tokens and session IDs
- Filenames and temporary IDs
- Distributed system identifiers
- Test data generation
FAQ
What is UUID v4?
UUID v4 is generated from completely random numbers. 122 bits are random, making collision probability extremely low - practically zero.
Difference between UUID and GUID?
They are essentially the same. UUID is common in Linux/open-source, GUID in Microsoft Windows environments.
What is the collision probability?
Even generating 1 billion UUIDs per second for 100 years, the probability of one collision is about 50%. Practically, you never need to worry about duplicates.