# UUID Generator

> Generate cryptographically random UUID v4 identifiers, one or a thousand at a time.

URL: https://uttir.com/uuid-generator
Categories: developer-tools, generators
Privacy: UUIDs are generated locally with your browser’s crypto API. Nothing is sent anywhere.

## About

This generator produces RFC 4122 version-4 UUIDs using your browser’s cryptographically secure random number generator (crypto.randomUUID). Each value is a 128-bit identifier with 122 random bits, so collisions are practically impossible at any realistic scale.

Generate a single ID or up to 1,000 at once for seeding databases, fixtures, and test data, and copy them all with one click.

## How to use

1. **Choose a count** — Any number from 1 to 1,000.
2. **Set the format** — Toggle uppercase letters or remove hyphens for compact IDs.
3. **Generate and copy** — Press Generate for a fresh batch; Copy all puts every UUID on your clipboard.

## Examples

### Standard format

The canonical 8-4-4-4-12 hexadecimal layout.

Output:

```
f47ac10b-58cc-4372-a567-0e02b2c3d479
```

### Compact uppercase

No hyphens, uppercase — common in legacy systems.

Output:

```
F47AC10B58CC4372A5670E02B2C3D479
```

## FAQ

### Are these UUIDs truly random?

Yes. They come from crypto.randomUUID, a cryptographically secure generator provided by your browser, not from Math.random.

### Can two generated UUIDs collide?

The probability is astronomically small — generating a billion UUIDs per second for a year would still make a collision vanishingly unlikely.

### Is the UUID generated in a secure way?

Yes. The browser uses the platform's cryptographically secure random source. Generated UUIDs are unique enough for database primary keys, request IDs, and identifiers you do not want to guess.

## Related tools

- [Base64 Encoder](https://uttir.com/base64-encoder) — Encode any text — including emoji and non-Latin scripts — into standard Base64.
- [Hash Generator](https://uttir.com/hash-generator) — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text instantly.
- [Unix Timestamp Converter](https://uttir.com/unix-timestamp-converter) — Convert Unix timestamps to readable dates and back, with a live current-time readout.

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For the full HTML page with the live tool, visit https://uttir.com/uuid-generator.
This file is the markdown rendering at https://uttir.com/uuid-generator.md. See https://uttir.com/llms.txt for a site-wide summary.