# UUID v4 Generator

> Generate random RFC 4122 version 4 UUIDs in bulk.

To generate UUIDs, set how many you need and they are produced instantly using crypto.randomUUID, the browser's built-in RFC 4122 version 4 generator. Version 4 UUIDs are 122 bits of randomness, so collisions are effectively impossible in practice.

**URL:** https://convertto.tech/t/uuid-v4-generator
**Category:** Hash & Crypto Tools (https://convertto.tech/c/crypto-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the how many.
2. Turn "Uppercase" on or off as needed.
3. Turn "Include hyphens" on or off as needed.
4. The result appears immediately — copy or download it.

## FAQ

### Can two UUIDs ever collide?

In theory yes, in practice no. A v4 UUID has 122 random bits; you would need to generate about 2.7 × 10^18 of them before a 50% chance of any collision.

### What is the difference between UUID and GUID?

They are the same 128-bit format. GUID is Microsoft's name for it. The only practical difference is that Microsoft tooling often displays them in braces and uppercase.

## Sources

- [RFC 9562 - Universally Unique IDentifiers (UUIDs)](https://www.rfc-editor.org/rfc/rfc9562) — IETF

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