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UUID Generator — Free Online Tool
A UUID, or universally unique identifier, is a 128-bit value written as 32 hexadecimal digits in five groups, such as 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated from random numbers, which makes the chance of two being the same so small that systems can create them independently without coordination. This generator calls the secure random function built into your browser to make a fresh v4 UUID every time. Click Generate 1 for a single identifier, or Generate 5 to get a batch you can copy into seed data, test fixtures, database rows, API request IDs or file names. Developers choose UUIDs as primary keys in distributed databases, as correlation IDs in logs and as unguessable tokens for resources, while testers need a steady supply of unique values. Because the values are random rather than sequential, UUID primary keys can fragment some database indexes, so consider time-ordered variants like UUID v7 for write-heavy tables. Remember that a UUID is an identifier, not a secret, and should not be used by itself as a password or access token for sensitive data. The tool works offline once the page is loaded, stores nothing and does not require an account.
Use our UUID Generator on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.
How to use UUID Generator
- Click Generate 1 for a single UUID, or Generate 5 for a batch.
- Review the UUIDs listed below the buttons.
- Select and copy the identifier you need.
- Click again to produce a new set.
Key benefits
- ✓ 100% free — no paywall or trial limits
- ✓ No account or email required
- ✓ Mobile-friendly responsive design
- ✓ Instant results in your browser
- ✓ Secure — data stays on your device
- ✓ Trusted by thousands of users daily
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Frequently Asked Questions
What is a UUID?
A UUID is a 128-bit identifier written as 32 hex digits in the pattern 8-4-4-4-12. It is designed to be unique across systems without a central registry.
What is the difference between UUID and GUID?
They are essentially the same thing. GUID is Microsoft's name for the UUID standard.
Can two UUIDs ever be the same?
In theory yes, but a collision between random v4 UUIDs is so unlikely that it is treated as impossible in practice.
Is a UUID secure enough to use as a password?
No. A UUID is meant to be unique, not secret. Use a proper random token or password generator for access control.
Which UUID version does this tool generate?
Version 4, random-based, created using your browser's secure random generator.