Free UUID Generator Online — v4 & v7 in One Click

Need a UUID? Skip the terminal. Our free UUID generator creates UUID v4 and v7 identifiers instantly — no signup, no installation, runs 100% in your browser.

What is a UUID?

A UUID (Universally Unique Identifier) — also called a GUID (Globally Unique Identifier) — is a 128-bit identifier that's virtually guaranteed to be unique. They look like this:

550e8400-e29b-41d4-a716-446655440000

UUIDs are the standard for generating unique IDs in distributed systems, databases, APIs, and pretty much any software that needs unique identifiers without a central authority.

UUID v4 vs UUID v7: Which Should You Use?

When to Use UUID v4

• You need random, unpredictable identifiers (API keys, tokens)
• You don't need time-based sorting
• Privacy matters — v4 reveals nothing about when it was created
• Maximum compatibility — every language and database supports v4

When to Use UUID v7

• Database primary keys (huge performance win over v4)
• Event IDs or log entries that benefit from chronological ordering
• Distributed systems where you want roughly time-ordered IDs
• Any case where you'd consider a ULID or Snowflake ID

How to Generate UUIDs in Code

JavaScript / Node.js

// Built-in (Node.js 14.17+ / modern browsers)
crypto.randomUUID();  // UUID v4

// npm package for v7
import { v7 } from 'uuid';
v7();  // UUID v7 (time-ordered)

Python

import uuid
str(uuid.uuid4())  # UUID v4

# For v7, use uuid6 package
from uuid6 import uuid7
str(uuid7())

Or Just Use Our Tool

Our UUID generator handles all of this for you — pick v4 or v7, choose your format, generate up to 1000 at once, and copy or download the results.

Common UUID Formats

Lowercase:   550e8400-e29b-41d4-a716-446655440000
Uppercase:   550E8400-E29B-41D4-A716-446655440000
No hyphens:  550e8400e29b41d4a716446655440000
Braces:      {550e8400-e29b-41d4-a716-446655440000}
URN:         urn:uuid:550e8400-e29b-41d4-a716-446655440000

Our generator supports all five formats. Pick whichever your database or API expects.

UUID Collision Probability

UUID v4 has 122 random bits, giving 5.3 × 10³⁶ possible values. To have a 50% chance of a collision, you'd need to generate approximately 2.7 × 10¹⁸ UUIDs — that's 2.7 quintillion. If you generated 1 billion UUIDs per second, it would take about 85 years to reach a 50% collision probability.

In practice: UUID collisions don't happen. You can safely use them as primary keys without worrying.

Why Our UUID Generator?

• Both v4 and v7 — most generators only offer v4
• Bulk generation — up to 1000 UUIDs at once
• 5 output formats — lowercase, uppercase, no hyphens, braces, URN
• 100% client-side — your UUIDs never leave your browser
• Copy or download — one click to copy, or download as .txt
• Zero signup — no accounts, no paywalls, no ads

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