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Open →Free UUID Generator
One click, one fresh UUID v4. Or generate 10 or 50 at once for database seeds and test data.
Copied ✓
Uses your browser's cryptographic random generator. 100% free · No signup · Runs offline.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit ID like 550e8400-e29b-41d4-a716-446655440000, used as database keys, session tokens and file names. This free generator creates version 4 UUIDs with your browser's cryptographic random number generator — no signup needed.
How to use it
- Generate one for a single ID.
- Generate 10 or 50 for seeding databases or test fixtures.
- Copy all grabs the whole list at once.
What does v4 mean?
Version 4 means the ID is randomly generated (122 random bits). The chance of two v4 UUIDs colliding is so small you can treat them as unique — that's why databases and distributed systems rely on them.
Private by design
IDs are generated with crypto.getRandomValues() inside your browser. Nothing is sent anywhere.
Frequently asked questions
Is this UUID generator free?
Yes — free forever, no signup, no limits.
Are the UUIDs really random?
Yes. They use your browser's cryptographic random generator (crypto.getRandomValues), the same source behind secure web features.
What is UUID v4?
Version 4 = randomly generated. Other versions derive IDs from timestamps or names; v4 is the standard choice when you just need a unique ID.
Can two UUIDs be the same?
In theory yes, in practice no — with 122 random bits, you'd need to generate billions per second for centuries to expect one collision.
Can I generate UUIDs in bulk?
Yes — 10 or 50 at a time, one per line, ready to paste into SQL or code.
Does it work offline?
Yes, once the page has loaded.
Short answer: A UUID (Universally Unique Identifier) is a 128-bit ID like 550e8400-e29b-41d4-a716-446655440000, used as database keys, session tokens and file names. This free generator creates version 4 UUIDs with your browser's cryptographic random number generator — no signup needed.
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