UUID Generator

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About UUID Generator

UUID Generator creates universally unique identifiers, 128-bit values written as 32 hexadecimal digits in five hyphen-separated groups. They're the standard way to label records and objects uniquely without needing a central authority to hand out IDs.

This tool produces version-4 (random) UUIDs, the most common general-purpose variant. Because they're generated from randomness rather than coordinated counters, they're ideal whenever data is created in multiple places at once, distributed systems, offline-first apps, microservices, where a shared auto-increment counter would be impractical or collision-prone.

Practical collisions are a non-issue: a v4 UUID carries 122 bits of randomness, so you would need to generate an astronomical number before a duplicate became likely. For real applications you can safely treat every generated value as unique.

Generation happens in your browser with secure randomness, so nothing is transmitted, and you can produce as many as you need for free. For large batches, the UUID Bulk Generator creates many at once, and the other ToolsMonk developer tools cover hashing, tokens, and encoding alongside it.

UUID Generator at a glance
PriceFree, no signup, no paywall, no watermark
Works onAny modern browser: desktop, tablet, and mobile
ProcessingIn your browser, files never leave your device
Account requiredNone
CategoryDeveloper Tools

Using UUID Generator, Step by Step

Open the tool, a UUID is generated immediately

Click to generate a new one whenever you need a fresh value

Copy the UUID with one click

Paste it into your code, database, or config

What UUID Generator Can Do

Generates universally unique identifiers (UUIDs) instantly

Produces standard version-4 (random) UUIDs

One-click copy, with the option to generate fresh values on demand

Created with secure browser randomness for genuine uniqueness

Runs in your browser, nothing is sent to a server

Free, with no signup and no rate limit

When to Use UUID Generator

Creating unique primary keys and identifiers for database records

Generating correlation IDs for logging and tracing requests

Producing unique keys for objects, files, or test fixtures

Seeding identifiers during development and API design

UUID Generator Tips for Best Results

  • Use v4 UUIDs as database keys when records are created in parallel across services, they won't collide like auto-increment IDs can

  • Store UUIDs as a native UUID type where your database supports it, rather than as plain strings, for efficiency

  • Need hundreds at once? Use the UUID Bulk Generator instead of clicking repeatedly

UUID Generator: Frequently Asked Questions

Common questions about this tool, its workflow, and what to expect before you use it.

Choose a format in the UUID Generator, set how many you need with the slider, from 1 to 100, and generate. Options include uppercase output and hyphens on or off. Copy one value, copy all of them at once, or download the list as a plain text file with one ID per line.

UUID v4 is fully random apart from its version bits. UUID v7 starts with a Unix millisecond timestamp, so values created later sort later. That ordering keeps database indexes compact and inserts fast, which is why v7 suits primary keys, while v4 is fine when ordering does not matter.

A ULID is a 26-character, lexicographically sortable ID written in Crockford Base32, useful when you want time ordering in a short string. A NanoID is a compact random ID made from letters, digits, underscore and hyphen, handy for URLs. The UUID generator also offers the all-zero NIL UUID for placeholders.

They use your browser's cryptographically secure random number generator, not Math.random, so values are unpredictable and collisions are vanishingly unlikely. Generation happens on your device, so the IDs are not logged by ToolsMonk. Even so, treat a UUID as an identifier, not as a secret or password.

The standard text form has hyphens in an 8-4-4-4-12 pattern, and most systems expect it. Some databases and APIs store the 32 hex characters without hyphens to save space, so the UUID generator lets you turn them off. Uppercase and lowercase are equivalent, though lowercase is the usual convention.

Standards and references for UUID Generator

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UUID Generator
Free online tool · no sign-up

Generate UUID v4, time-ordered UUID v7, NIL, ULID and NanoID, cryptographically random, in bulk.

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