UUID Generator
Generate random UUID v4 or time-ordered UUID v7 identifiers in bulk.
UUID version: Use v4 for random IDs or v7 for time-ordered database keys.
Output will appear here...About UUID Generator
A UUID generator creates universally unique identifiers — 128-bit values written as 32 hexadecimal digits in the familiar 8-4-4-4-12 pattern — that independent systems can create without a central counter. This free online UUID generator supports random UUID v4 and time-ordered UUID v7. Choose v4 for opaque general-purpose identifiers, request IDs, and test data; choose v7 when chronological sorting and database index locality matter. Generate one value or a bulk list of up to 500, then copy or download the results.
Every UUID is created locally with your browser's cryptographically secure Web Crypto API, so nothing is uploaded or stored. UUIDs and GUIDs describe the same 128-bit identifier format, which means the output works anywhere either term is accepted. For shorter URL-friendly identifiers, try the Nano ID Generator; for credentials that must be secret, use the API Key Generator instead.
How to Use
- 1Choose UUID v4 for a random identifier or UUID v7 for a time-ordered identifier suited to database keys.
- 2Set how many you need; the generator can produce a single UUID or a large batch in one click.
- 3Click generate — the UUIDs appear instantly, created locally in your browser with secure randomness.
- 4Copy one value or the whole list to your clipboard, ready to paste into a database, config, or test fixture.
Common Use Cases
- Seeding database primary keys or public record IDs that services can create without coordinating
- Generating idempotency keys so an API request can be safely retried without duplicating the action
- Creating collision-free file names, upload IDs, or session and request identifiers for tracing
- Producing a batch of sample UUIDs to populate test fixtures and local development data
Frequently Asked Questions
What's the difference between UUID v4 and v7?
UUID v4 uses 122 random bits and is a strong default for opaque identifiers. UUID v7 begins with a Unix millisecond timestamp and then adds random data, so values sort by creation time and usually behave better as database index keys.
Are UUID collisions possible?
In practice, no. A version 4 UUID has 122 random bits, so you'd need to generate about 2.71 quintillion of them before there's even a 50% chance any two match — which is why they're safe as globally unique keys.
Is a UUID the same as a GUID?
Yes. GUID (globally unique identifier) is Microsoft's name for the exact same 128-bit format that's standardized as a UUID. The value this tool generates works anywhere either term is used.
Is this UUID generator private and free?
Yes. Every UUID is generated locally in your browser using secure randomness — nothing is sent to a server, so even IDs for sensitive systems stay on your machine. The tool is completely free with no limits on how many you generate.
Can I generate multiple UUIDs at once?
Yes. Set the count and the generator produces a whole batch in a single click, which you can copy as a list — handy for seeding a database table or filling out test data.
Is UUID Generator free to use?
Yes. UUID Generator is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.
Is my data safe when I use UUID Generator?
Absolutely. UUID Generator runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.
Features
- Run UUID Generator instantly, right in your browser
- 100% private — your data never leaves your device
- Copy the result to your clipboard in one click
- Free and unlimited with no account or sign-up
- Clear, friendly error messages when something is wrong
- Works on desktop and mobile, even offline after first load