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UUID Generator Online Free | MyToolbox

Generate random UUIDs (v4) instantly. Free UUID generator for developers. Cryptographically random, RFC 4122 compliant. No signup.

How to Use UUID Generator

  1. 1

    Click generate

    Click the generate button to create a new random UUID. A new unique identifier is produced each time.

  2. 2

    Copy the UUID

    Click copy to place the UUID on your clipboard. Paste it into your database, code, or configuration.

  3. 3

    Generate in bulk

    Need multiple UUIDs? Generate several at once and copy them all for batch use in databases or test data.

Why Use Our UUID Generator

Cryptographically Random

Uses crypto.getRandomValues() for true randomness. Generated UUIDs are suitable for production use as database keys, session IDs, and unique identifiers.

RFC 4122 Compliant

All generated UUIDs conform to the RFC 4122 v4 specification: the correct version bits and variant bits are set.

Bulk Generation

Generate multiple UUIDs at once for batch operations. Useful for seeding test databases or generating multiple IDs at once.

Multiple Formats

Copy UUIDs in standard format (with hyphens), without hyphens, or in uppercase — whatever your system requires.

Instant and Private

UUIDs are generated in your browser using the Web Crypto API. No server calls, no logging, no tracking.

Frequently Asked Questions

Is the UUID generator free?
Yes, completely free. Generate as many UUIDs as you need with no limits and no signup.
Are generated UUIDs truly random?
Yes. They are generated using the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers. The collision probability is astronomically low.
What UUID version does this generate?
Version 4 (v4), which uses random or pseudo-random numbers. This is the most commonly used version in modern software development.
Can I use these UUIDs as database primary keys?
Yes. UUIDv4 is widely used as a primary key in databases like PostgreSQL, MySQL, MongoDB, and DynamoDB. The collision probability is effectively zero.
How does this compare to uuidgenerator.net?
Both generate valid UUIDv4 values. MyToolbox offers bulk generation, multiple format options, and a cleaner interface with no ads.
What is the probability of a UUID collision?
Astronomically low. You would need to generate about 2.71 quintillion (2.71 x 10^18) UUIDs to have a 50% chance of a single collision. For practical purposes, collisions do not happen.
Does this work offline?
Yes. UUID generation uses only the browser's Web Crypto API and works without an internet connection once the page is loaded.
What is the format of a UUID?
A UUID is a 128-bit number displayed as 32 hexadecimal digits in five groups separated by hyphens: 8-4-4-4-12 format, like 550e8400-e29b-41d4-a716-446655440000.

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