# UUID Generator

> Free UUID generator for v4, v7 and NIL. Create unique identifiers in bulk with uppercase, hyphen-free and brace options, then copy or download — runs locally, no signup.

Generate cryptographically-random UUID v4, time-ordered UUID v7 and NIL identifiers in bulk, with uppercase, no-hyphen and brace formats — copy or download them in one click.

- **Live tool:** https://www.toolnova.org/dev-tools/uuid-generator
- **Category:** Developer Tools (https://www.toolnova.org/dev-tools)
- **Price:** Free
- **Requirements:** Runs in a modern web browser · No signup · No install

## What this tool does

- UUID v4 (random) and v7 (time-ordered) versions
- NIL UUID plus bulk generation up to 1000
- Cryptographically secure randomness
- Uppercase, no-hyphen and brace (GUID) formats
- Copy all or download as a .txt file
- Runs locally — no server calls, no signup

## How to use UUID Generator

1. **Set the amount** — Choose how many UUIDs you need.
2. **Pick a format** — Toggle uppercase, no hyphens or braces.
3. **Generate** — Click generate for a fresh batch.
4. **Copy** — Copy all UUIDs to your clipboard.

## Common use cases

- Seed database primary keys
- Create unique API request IDs
- Generate test fixtures and mock data
- Produce idempotency keys

## About

### Random and time-ordered IDs on demand

A UUID (Universally Unique Identifier) is a 128-bit value used to label database rows, API resources, files and messages without a central authority handing out numbers. This generator creates version-4 UUIDs, whose bits are almost entirely random, plus modern version-7 UUIDs that embed a millisecond timestamp so they sort chronologically — ideal as database primary keys. It uses your browser's cryptographically secure random number generator, so collisions are effectively impossible.

### Format them the way your code expects

Need them uppercase for a legacy system, stripped of hyphens for a compact key, or wrapped in braces like a Windows GUID? Toggle the options and every UUID reformats instantly. Switch between v4, v7 and the all-zero NIL UUID, generate up to a thousand at a time, and copy the whole list or download it as a text file. Everything happens locally, so nothing is ever transmitted.

## FAQ

### What is a UUID v4?

A version-4 UUID is a 128-bit identifier whose bits are almost all random. It's the most common UUID type because it needs no central coordination and has a negligible chance of collision.

### Are these UUIDs truly random and safe to use?

Yes. They're generated with your browser's cryptographically secure random source (crypto.randomUUID or crypto.getRandomValues), which is suitable for identifiers.

### Can I generate many at once?

Yes — create up to 1,000 UUIDs in a single batch and copy them all with one click.

### Is anything sent to a server?

No. All generation happens locally in your browser, so your identifiers never leave your device.

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ToolNova — free, privacy-first browser tools. Most tools process data locally on your device. See https://www.toolnova.org/llms.txt for the full directory.