How it works
How to use the UUID Generator
Pick a version
v4 is random; v7 embeds a millisecond timestamp so IDs sort by creation time.
Choose how many and a format
Up to 10,000 at once, as a list, JSON array, SQL IN list or CSV.
Copy or download
Paste any UUID into the inspector to see its version, variant and embedded time.
UUID v4 or v7?
UUID v4 is 122 bits of randomness — ideal when IDs must be unpredictable. UUID v7 (RFC 9562) starts with a Unix timestamp, so new IDs are always increasing. That keeps database B-tree indexes compact and makes v7 a great primary key. Both are generated with crypto.getRandomValues, the browser's secure random number generator.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Can two generated UUIDs collide?
In practice, no. You would need to generate billions of v4 UUIDs per second for many years to have a meaningful chance of a single collision.
What is the difference between a UUID and a GUID?
They are the same thing. GUID is Microsoft’s name for UUID.
Is my data uploaded anywhere?
No. This tool runs entirely in your browser. Your input never leaves your device, is not logged, and works offline once the page has loaded.
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