A UUID, or Universally Unique Identifier, is a standardized 128-bit identifier used to label records, objects, sessions, requests, and many other entities across software systems. It is commonly written as a 36-character string with hexadecimal characters and hyphens.

What does UUID v4 mean?

UUID v4 is the random version of the UUID standard. Instead of being based on timestamps or hardware identifiers, it uses randomness to generate the identifier, making it a common choice for application-level IDs, APIs, databases, and test data.

Can I generate multiple UUIDs at once?

Yes. This tool lets you create one UUID or generate hundreds in a single run, then copy the full output instantly.

Can I remove hyphens from a UUID?

Yes. You can switch to a compact no-hyphens format when you want a 32-character hexadecimal string instead of the standard dashed layout.

Can I generate uppercase UUIDs?

Yes. This tool includes an uppercase option if your workflow, UI, or system conventions prefer uppercase hexadecimal characters.

UUID Generator - Free Online Tool

Generate UUID v4 identifiers instantly

A UUID Generator creates standardized random identifiers that you can use in databases, APIs, apps, test data, logs, and import workflows.

If you need a fast way to generate one UUID or a long list of UUIDs without writing code, this tool gives you exactly that.

You can:

generate one or hundreds of UUID v4 values
create fresh IDs instantly with Regenerate
switch to uppercase output
remove hyphens for a compact 32-character format
copy the full output in one click

Whether you need a single record ID or a bulk list for fixtures and QA work, this tool keeps the process simple.

What a UUID is

A UUID, short for Universally Unique Identifier, is a standardized 128-bit identifier used across software systems.

The most familiar UUID format looks like this:

123e4567-e89b-12d3-a456-426614174000

A standard UUID includes:

hexadecimal characters
fixed group lengths
hyphens separating the groups

Because UUIDs are standardized and widely supported, they are commonly used in:

databases
APIs
distributed systems
test fixtures
queue messages
import and export workflows
session or request correlation

UUIDs are especially useful when you want identifiers that can be created independently without relying on an incrementing counter.

What UUID v4 means

There are multiple UUID versions, but UUID v4 is the version most developers mean when they ask for a random UUID.

UUID v4 uses randomness to produce the identifier while still following the expected UUID structure.

That makes it a strong choice when you want IDs that are:

widely recognized
easy to validate
compatible with many tools and libraries
practical for records, events, and testing

For many application workflows, UUID v4 is the default answer when you need a unique identifier and do not want to manage a central sequence.

What this tool does

This UUID Generator is built for quick, practical use.

You can:

generate from 1 to 1000 UUIDs in one run
create new random values instantly
output standard dashed UUID v4 strings
switch to uppercase if needed
remove hyphens for compact output
copy the full list directly from the output box

It is useful for both one-off values and bulk developer workflows.

How to use the UUID Generator

1. Choose how many UUIDs to create

Use the Count field to decide how many UUIDs you want.

Examples:

1 for a single identifier
10 for a small sample set
100 or more for testing, fixtures, or imports

2. Decide whether to use uppercase

Enable Uppercase if your workflow prefers uppercase hexadecimal characters.

This does not change the meaning of the UUID. It only changes the display format.

3. Choose whether to remove hyphens

Enable No hyphens if you want a compact version.

This converts the standard dashed UUID into a 32-character hexadecimal string.

That format can be useful when:

a system expects compact IDs
you want cleaner copy-paste into certain fields
you need identifiers without separators

4. Generate or regenerate

The tool updates automatically when you change the settings, and you can also click Regenerate to create a fresh set instantly.

5. Copy the output

Use the copy button to copy the full result list in one click.

Understanding the output formats

Standard UUID format

The default layout follows the familiar dashed pattern:

xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

This is the most recognizable and commonly used format.

It is ideal when:

you want compatibility with standard UUID parsers
you are storing UUIDs in systems that expect the dashed layout
you want the output to be immediately recognizable as a UUID

Compact UUID format

With No hyphens enabled, the UUID becomes a continuous 32-character hexadecimal string.

Example:

123e4567e89b12d3a456426614174000

This can be useful when:

the target field does not allow separators
you want a cleaner visual format
you are matching a system that stores UUIDs without dashes

Uppercase UUID format

With Uppercase enabled, hexadecimal letters are displayed in uppercase:

123E4567-E89B-12D3-A456-426614174000

This is mostly a style or compatibility preference.

When to use UUIDs

UUIDs are useful when you need identifiers that can be generated independently and still remain highly unlikely to collide.

Common use cases include:

Database record IDs

UUIDs are often used as primary keys or public record identifiers, especially when records may be created across multiple systems.

API resources

They work well for resource identifiers in REST or internal APIs.

Import and export workflows

Bulk-generated UUIDs can help map rows, records, or external references during imports.

QA and test fixtures

If you need realistic IDs for development, staging, or testing, generating a batch of UUIDs is often the fastest approach.

Request tracing and logs

UUIDs are also common for correlation IDs, event tracking, and debugging workflows.

UUID vs NanoID

A common product decision is whether to use UUID or NanoID.

UUID is usually better when you want:

a widely recognized standard
fixed structure and predictable formatting
broad compatibility across tools and databases
easy validation using existing libraries

NanoID is usually better when you want:

shorter identifiers
URL-safe compact strings
flexible length
custom alphabets

In general:

choose UUID when standardization and compatibility matter most
choose NanoID when compactness and flexibility matter most

That is why many teams use UUIDs for backend or interoperability workflows and NanoIDs for shorter user-facing identifiers.

Common mistakes and how to avoid them

Confusing formatting with the actual value

Uppercase vs lowercase does not change the identity of a UUID. It is still the same hexadecimal value, just displayed differently.

Assuming hyphen removal creates a different ID type

Removing hyphens only changes formatting. The value is still the same UUID represented in compact form.

Using non-random IDs when randomness is expected

If you specifically need UUID v4, make sure the tool or code actually generates random UUIDs instead of timestamp-based or sequential IDs.

Mixing UUID formats inside one workflow

If one part of your system stores dashed UUIDs and another expects compact ones, normalizing the format early can prevent validation and lookup issues.

Why this tool is useful

You can generate UUIDs in code, but many real-world tasks do not justify opening a terminal or writing a script.

This tool helps when you want to:

create a UUID quickly for a database row or CMS field
generate a list of IDs for QA data
compare dashed and compact output visually
prepare identifiers for seed files or spreadsheets
copy ready-made UUIDs into docs, APIs, or test payloads

It removes friction from a task developers and product teams do all the time.

Perfect for

developers
QA teams
product teams
data import workflows
API testing
staging and demo data creation
anyone who needs a reliable online UUID v4 generator

If you need fast, standardized, RFC-compliant random identifiers, this UUID Generator gives you a simple way to create them in bulk or one at a time.

Generate UUID v4 values instantly, switch to uppercase or no-hyphens when needed, and copy the results in one click.