UUID Generator

Quickly generate RFC4122-compliant Universally Unique Identifiers (UUIDs). Choose between Version 1 (timestamp) and Version 4 (random).

Configuration

Formatting

Generated UUIDs

0 items

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What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. They are designed to be globally unique, meaning the chance of the same UUID being generated twice — even across different systems — is infinitesimally small.

UUIDs are crucial in modern distributed software where multiple independent systems need to create identifiers without coordinating with a central database. This makes them perfect for API keys, session tokens, and database primary keys.

Key Features

v4 & v1 Support

Generate both completely random (v4) and time-based (v1) identifiers.

Bulk Generation

Create up to 1,000 unique IDs in a single batch for testing or database population.

Custom Formats

Toggle between Uppercase/Lowercase and choose whether to include hyphens.

100% Secure

All processing happens locally in your browser. No data leaves your device.

RFC Compliant

Fully compatible with RFC 4122 standard, ensuring interoperability.

Easy Export

One-click Copy to Clipboard or Download as a text file for convenience.

How to use this tool?

  1. Choose Version: Select Version 4 (Random) for most use cases, or Version 1 if you need time-based sorting.
  2. Set Quantity: Enter how many UUIDs you need (e.g., 50) in the input field.
  3. Customize: Use the toggles to enable Uppercase or remove Hyphens to match your database requirements.
  4. Generate & Export: Click Generate, then use the floating actions to Copy or Download the list.

Common Use Cases

Database Primary Keys

Avoid collisions when merging databases from different sources by using UUIDs instead of auto-incrementing integers.

Session Management

Generate unguessable session tokens for user authentication to prevent session hijacking attacks.

File Uploads

Assign unique names to uploaded files to prevent overwriting when multiple users upload files with the same name.

Transaction IDs

Track requests across microservices with unique transaction or correlation IDs for simpler debugging.

Frequently Asked Questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. Because the probability of duplicate UUIDs is virtually zero, they are widely used as database keys, session identifiers, and transaction IDs in distributed systems without requiring a central coordination authority.
What is the difference between UUID v1 and v4?
Version 1 is generated using a timestamp and the MAC address of the computer, making it unique across space and time but potentially traceable (and sequential). Version 4 is generated using random numbers, offering a very high probability of uniqueness without revealing the generator identity (recommended for most use cases).
How do I generate a bulk list of UUIDs?
Simply enter the desired quantity in the "Quantity" field (up to 1000) and click "Generate". You can then download the entire list as a text file or copy it to your clipboard.
Can I generate UUIDs without hyphens?
Yes! Toggle the "Include Hyphens" switch to OFF in the formatting options. You can also generate uppercase UUIDs by toggling the "Uppercase" switch.
Are these UUIDs collision-free?
For all practical purposes, yes. The total number of possible Version 4 UUIDs is 2^122, which is approximately 5.3 x 10^36. The probability of a collision is so infinitesimally small that it is negligible for almost any application.
Is this tool secure and private?
Yes, absolutely. The generation happens entirely on your device (client-side) using JavaScript. No data is sent to our servers, making it safe to use even for sensitive internal projects.
What is a GUID vs UUID?
GUID (Globally Unique Identifier) is simply the Microsoft terminology for UUID. They are effectively the same thing and follow the same RFC 4122 standard.
Can I use these for database Primary Keys?
Yes, UUIDs are excellent candidates for primary keys, especially in distributed databases (like Cassandra, DynamoDB) or when you need to generate IDs before saving records (e.g., in offline-first apps).
How random is the generation?
We use the industry-standard `uuid` library which relies on cryptographically strong random number generators (CSPRNG) available in modern browsers.
Is there a limit to how many I can generate?
To ensure browser performance, we limit single-batch generation to 1000 items. However, you can generate as many batches as you like instantly.