UUID Generator

Generate universally unique identifiers (UUID v4)

Settings

Customize UUID format

Generate 5 UUIDs

UPPERCASE output

With hyphens (e.g., xxxx-xxxx)

Generated UUIDs

Click to copy individual UUIDs

How to use this tool

Select UUID version: By default, we generate universally recognized UUID v4.
Choose format: Check options to toggle UPPERCASE or hyphenated formats.
Set quantity: Define how many UUIDs you want to generate simultaneously (up to 500).
Click Generate: Re-generate a fresh batch of UUIDs anytime.
Copy or download: Copy individual UUIDs, copy all, or download them as a .txt file.

Example

Settings:

Format: UPPERCASE, With hyphens

Quantity: 3

Output:

123E4567-E89B-42D3-A456-426614174000

987F6543-A21C-46D8-B987-123456789ABC

567A8901-B34D-48E9-C012-345678901DEF

Frequently asked questions

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. UUIDs are practically guaranteed to be unique across all systems.

What is UUID v4?

UUID version 4 uses random numbers to generate the identifier. It's the most commonly used UUID version and provides excellent uniqueness guarantees.

When should I use UUIDs?

Use UUIDs for database primary keys, session IDs, file names, or any scenario where you need globally unique identifiers without central coordination.

Are UUIDs truly unique?

While theoretically possible to generate duplicates, the probability is so low (1 in 2^122) that it's considered negligible for practical purposes.

Should I use hyphens?

Hyphens improve readability but some systems prefer UUIDs without hyphens. Choose based on your requirements.

Related tools

UUID generator

How the uuid generator helps

Use the UUID generator to create random version 4 identifiers for development work, mock data, database records, test fixtures, logs, prototypes, and systems that need unique-looking IDs without a central sequence. UUIDs are especially useful when different systems may create records independently.

Utility Tally tools are built for quick, practical workflows: prepare the input, review the result, copy or download the output, and move on without creating an account. The guidance below explains how to use this page responsibly, what the result means, and which related tools or guides can help with the next step.

For best results, start with sample or non-sensitive data when you are learning a tool, then move to real work only after you understand the output. If the result will be sent to a client, imported into software, printed, published, or used in a security-related workflow, take an extra minute to verify formatting, totals, links, spelling, privacy, and destination requirements.

How to use it

Choose how many UUIDs you need.
Generate the identifiers in your browser.
Copy the full list or individual values.
Use them as test IDs, record IDs, correlation IDs, or sample data where UUID format is accepted.
Do not treat random UUIDs as passwords or secret tokens.

How it works

A version 4 UUID is generated from random bits and displayed in a standard 36-character format with hyphens. The version and variant positions follow the UUID specification, while the remaining bits provide a very large random space that makes accidental collision unlikely in normal use.

The result should be treated as a working output, not a substitute for professional review where tax, security, accessibility, legal, accounting, or production data requirements apply. Check the destination system, final format, and any local rules before relying on the result.

Practical tips

UUIDs are identifiers, not proof of authorization or ownership.

Use stable IDs in test fixtures when repeatability matters.

Random UUIDs are useful for distributed systems because they avoid a single counter.

For database performance, confirm whether random IDs are appropriate for your storage engine and indexing strategy.

UUID Generator FAQ

Are UUIDs guaranteed unique?

They are not mathematically guaranteed, but version 4 UUID collisions are extremely unlikely for ordinary use.

Can I use a UUID as a password?

No. UUIDs are identifiers, not authentication secrets.

Why are there hyphens in UUIDs?

The hyphens are part of the common display format and make the sections easier to read.