UUID Generator

Generate UUIDs (v1 and v4) individually or in bulk

A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. We generate version 4 UUIDs (which are cryptographically secure random values) and version 1 UUIDs (time-based values).

How to use UUID Generator

  1. Select Version. Select Version 4 (Random) or Version 1 (Time-based).
  2. Set Quantity. Select how many unique IDs to generate.
  3. Click Generate. Copy individual IDs or the entire bundle.

Features

  • Offline Processing: Computes operations instantly in your local browser client.
  • One-Click Copy: Instantly copy inputs or outputs to your clipboard.
  • Precision Outputs: Processes inputs immediately to provide clean, error-free results.

Why use this tool

  • Guaranteed Uniqueness: Version 4 offers virtually zero chance of collision.
  • Bulk Generation: Instantly create up to 100 UUIDs at a time.

Frequently asked questions

What is a UUID and what is it used for?

A UUID (universally unique identifier) is a 128-bit value written as 32 hex digits in the form 8-4-4-4-12, such as 123e4567-e89b-12d3-a456-426614174000. It is used for database keys, request IDs and file names where IDs must be created without a central counter.

What is the difference between UUID v1 and v4?

Version 4 is built from random numbers, while version 1 is built from a timestamp plus a node value. This tool offers v4 and v1. Random v4 is the usual choice because it reveals nothing about when or where it was made.

Are the generated UUIDs really unique?

A v4 UUID has 122 random bits, so the chance of two colliding is negligible for practical purposes. The tool uses the browser crypto.randomUUID function when available. Its v1 option is a simplified time-based generator with a random node, so do not treat it as a standards-strict v1.

How do I generate multiple UUIDs at once?

Choose a quantity, pick the version and click generate to get a list you can copy in one go. Options let you switch to uppercase or remove the hyphens, which is useful for systems that store the 32 characters as a plain string.

UUID vs GUID: is there a difference?

They are effectively the same thing. GUID is the name Microsoft uses for the same 128-bit identifier format, and the values are interchangeable. Some Microsoft tools show GUIDs in uppercase or with braces, which is only a display difference.

Are UUIDs safe to use as secrets or tokens?

A UUID is an identifier, not a secret. Do not rely on one as a password, API key or session token by itself. A random v4 UUID is hard to guess, but a v1 UUID contains a timestamp and is more predictable, and UUIDs are often exposed in URLs and logs.

What is a UUID?

A Universally Unique Identifier (UUID) is a 128-bit label used for information identification in computer systems.

Is a v4 UUID truly random?

Yes, v4 UUIDs rely on cryptographically secure pseudorandom numbers to ensure collision-free keys.

Is my data shared when using the UUID Generator?

No. Toolskyt operates under a zero-server policy. All calculations, data formatting, and file exports are executed locally on your machine.

Do I need to sign up or pay to use the UUID Generator?

No, this tool is 100% free. There are no limits, sign-ups, subscriptions, or hidden charges required.

Related tools