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UUID Generator

Generate random version 4 UUIDs in bulk, entirely in your browser.

Version 4
Cryptographically secure
Bulk generation
100% private
Options

Between 1 and 5,000.

Output in capital letters.

Strip the dashes from output.

Results (1)
  • 8c462503-d163-41f2-81d8-c00f0dbae50f

Generate version 4 UUIDs instantly in your browser

A UUID generator creates universally unique identifiers — 128-bit values that let independent systems label data without ever coordinating with one another. Our free tool produces cryptographically strong version 4 UUIDs directly in your browser, so you can spin up a single identifier or a batch of thousands in an instant. Because generation uses the secure crypto.getRandomValues API, every value carries 122 bits of randomness and is effectively guaranteed to be unique.

Developers reach for UUIDs constantly: as database primary keys that can be generated on the client, as correlation IDs that stitch together logs across microservices, as idempotency keys for safe API retries, and as collision-free file or session names. Generating them by hand is impractical, and copying from unreliable sources risks duplicates. This tool removes that friction with clean, well-formatted output and flexible options for case and formatting.

Everything runs locally with no uploads, no accounts, and no tracking, so the identifiers you create stay entirely on your device. Choose how many you need, toggle uppercase or hyphen removal to match your schema, then copy an individual value, copy the whole list, or download it as a text file. It is a fast, private, dependable way to produce the identifiers your applications rely on.

Why use UUID Generator?

Cryptographically secure

Uses the browser's crypto.getRandomValues API, giving 122 bits of randomness and collision probabilities too small to matter in practice.

Bulk generation

Create a single UUID or thousands at once, then copy the whole batch or download it as a text file in one click.

Flexible formatting

Toggle uppercase output or strip hyphens to match your database schema, API contract, or file-naming convention.

Completely private

All UUIDs are generated locally in your browser. Nothing is uploaded, logged, or stored on any server.

How to use UUID Generator

  1. 1

    Set the quantity

    Enter how many UUIDs you need, from one to several thousand, using the count input.

  2. 2

    Choose formatting options

    Optionally switch to uppercase or remove hyphens to fit your target system's requirements.

  3. 3

    Generate

    Click Generate and the full list of version 4 UUIDs appears instantly, ready to use.

  4. 4

    Copy or download

    Copy any single UUID, copy the entire list to your clipboard, or download everything as a .txt file.

Common use cases

Database primary keys

Generate client-side keys for records so systems can insert data without waiting on a central sequence, ideal for distributed and offline-first apps.

API request tracing

Attach a UUID as a correlation or idempotency key to safely retry requests and follow a single operation across microservices and logs.

Unique file and asset names

Name uploads, exports, and temporary files with UUIDs to eliminate naming collisions in shared storage buckets.

Test and seed data

Quickly fabricate large sets of unique identifiers for load testing, fixtures, or seeding a development database.

Features at a glance

Frequently asked questions

What is a UUID and how is version 4 different?

A UUID (Universally Unique Identifier) is a 128-bit value used to identify information uniquely across systems without a central authority. Version 4 UUIDs are generated from random or pseudo-random numbers rather than timestamps or MAC addresses. This makes them ideal for privacy-sensitive use because they reveal nothing about the machine or time that created them.

Are the UUIDs generated by this tool truly unique?

Version 4 UUIDs use 122 bits of randomness, giving roughly 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically small — you would need to create billions of UUIDs per second for many years before a collision became likely. For practical purposes they are treated as guaranteed unique.

Does this UUID generator send data to a server?

No. Every UUID is generated locally in your browser using the cryptographically secure crypto.getRandomValues API. Nothing is transmitted, logged, or stored on any server, so the identifiers you create remain completely private on your device.

Can I generate many UUIDs at once?

Yes. Enter the number of UUIDs you need — from one to thousands — and the tool produces the whole batch instantly. You can then copy an individual value or copy the entire list to your clipboard in one click, or download them as a text file.

What are common uses for UUIDs?

UUIDs are widely used as database primary keys, API request identifiers, distributed system correlation IDs, file names, session tokens, and message identifiers. They let independent systems generate keys without coordinating with each other, which prevents collisions in distributed and offline-first applications.

Your privacy matters

UUID Generator runs entirely in your web browser. Your files, text, and data are never uploaded to any server, never stored, and never seen by us or any third party. This client-side architecture means you can safely process confidential business documents, personal records, and proprietary data without privacy concerns.

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