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UUID Generator

Generate secure random UUID v4 identifiers instantly online. Create single or bulk UUIDs, choose uppercase or lowercase output, remove hyphens and copy or download results directly in your browser.

Generate UUID v4

Generate one or multiple secure random UUID version 4 identifiers directly in your browser.

Generate between 1 and 100 UUIDs at a time.

UUID Format
Letter Case
0 generated

Shortcut: Ctrl/Cmd + Enter to generate

UUID Statistics

Details about the generated UUID v4 identifiers and selected output format.

Generated

0

Bits Per UUID

128

Bytes Per UUID

16

Text Characters

36

UUID v4 Structure

A standard UUID is a 128-bit value usually displayed as 32 hexadecimal characters divided into five groups.

550e8400 - e29b - 41d4 - a716 - 446655440000

Group 1

8

hexadecimal characters

Group 2

4

hexadecimal characters

Group 3

4

begins with version 4

Group 4

4

includes variant bits

Group 5

12

hexadecimal characters

Common Uses for UUIDs

UUIDs are useful when applications need identifiers that can be created independently without relying on one shared sequential counter.

Database Records

UUIDs can be used as primary keys or public identifiers for users, orders, documents and other database records.

API Resources

APIs often use UUIDs to identify resources without exposing a simple sequential numbering scheme.

Distributed Systems

Different application instances can generate identifiers without requesting the next number from one central service.

Request Tracing

A UUID can be attached to related logs and service requests as a correlation identifier during debugging.

Test Data

Bulk generation makes it easy to create unique identifiers for fixtures, seed data and application tests.

Client-Side Resources

A frontend can generate an identifier before a new object has been sent to or persisted by the backend.

UUID vs Sequential ID

Both identifier styles are useful. The right choice depends on the architecture and database requirements of the application.

Property UUID v4 Sequential ID
Example 550e8400-e29b-41d4-a716-446655440000 15428
Generation Can be generated independently Usually generated centrally
Predictable Generally difficult to predict Usually predictable
Creation Order UUID v4 is not time ordered Usually naturally ordered
Storage Larger identifier Usually smaller

UUIDs Are Identifiers, Not Secrets

A UUID may look complex and unpredictable, but it should not automatically be treated as a password, API key or authentication token.

UUIDs are primarily identifiers. Sensitive resources should still be protected by proper authentication and authorization controls.

Private Browser-Based UUID Generation

UUIDs are generated directly inside your browser using secure random functionality provided by the browser.

  • No file upload is required.
  • Generated UUIDs do not need to be sent to SwiftVecto's server.
  • Modern browsers use crypto.randomUUID() where available.
  • A secure crypto.getRandomValues() fallback is used when necessary.
  • Generated lists can be copied or downloaded directly from your browser.

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How to Generate UUID v4 Identifiers

Use the SwiftVecto UUID Generator to create secure random UUID version 4 identifiers instantly. Generate one UUID or create a bulk list, choose uppercase or lowercase hexadecimal output and optionally remove hyphens before copying or downloading the results.

Overview

A UUID, or Universally Unique Identifier, is a 128-bit identifier commonly used in databases, APIs, distributed systems, software applications and infrastructure where identifiers need to be generated without relying on a central numbering service. UUID version 4 values are based primarily on random data and are one of the most widely recognised UUID formats for general application development. A standard UUID is normally represented as 32 hexadecimal characters divided into groups by hyphens, producing a familiar 36-character textual form. This UUID Generator focuses on secure UUID v4 generation using cryptographically strong randomness where available and supports bulk generation for developers who need multiple unique identifiers during development, testing or data preparation.

Benefits

Generate UUID version 4 identifiers instantly.
Create a single UUID or multiple UUIDs at once.
Generate up to 100 UUIDs in one operation.
Uses random values suitable for general UUID v4 generation.
Choose lowercase hexadecimal output.
Choose uppercase hexadecimal output.
Keep the standard UUID hyphenated representation.
Remove hyphens when an application requires compact identifiers.
Copy generated UUIDs directly to the clipboard.
Copy a complete bulk UUID list at once.
Download generated UUIDs as a text file.
Useful for database primary keys and external identifiers.
Useful for API resource IDs and distributed application identifiers.
Useful for test data, fixtures and development environments.
No file upload is required.
Designed to generate identifiers directly inside the browser during normal use.

How It Works

Choose how many UUIDs you want to generate.

The generator creates random bytes using a cryptographically strong random source where available.

Specific UUID version and variant bits are set according to the UUID v4 structure.

The resulting 128-bit value is converted into hexadecimal text.

The standard representation groups the hexadecimal characters using hyphens.

The generated value contains the UUID version number in the appropriate position.

The variant field is also set according to the standard UUID representation.

Optional formatting can convert the hexadecimal letters to uppercase.

Hyphens can optionally be removed when a compact identifier is required.

Generated values can be copied or downloaded immediately.

How to Use This Tool

  1. 1
    Choose the number of UUIDs you want to generate.
  2. 2
    Select lowercase or uppercase hexadecimal output.
  3. 3
    Choose whether the UUIDs should include standard hyphens.
  4. 4
    Select Generate UUID.
  5. 5
    Review the generated identifier or UUID list.
  6. 6
    Copy an individual UUID when you only need one value.
  7. 7
    Copy all generated UUIDs when creating multiple identifiers.
  8. 8
    Download the UUID list as a text file if required.
  9. 9
    Change the options and generate another set whenever needed.

Helpful Tips

  • Use the normal hyphenated UUID format unless your application specifically requires compact identifiers.
  • Store UUIDs consistently using the same representation throughout an application.
  • Avoid manually changing random UUID characters after generation.
  • Use database-native UUID column types where your database supports them appropriately.
  • Do not assume UUIDs should be sequential like traditional integer database IDs.
  • UUID v4 identifiers are useful when IDs need to be generated independently by multiple application instances.
  • Bulk generation is useful for test fixtures, seed data and sample API responses.
  • Removing hyphens changes the textual representation but does not change the underlying 128-bit UUID value.
  • Uppercase and lowercase UUID hexadecimal characters represent the same underlying value.
  • Do not use UUIDs as passwords, authentication secrets or cryptographic access tokens.
  • A UUID is an identifier rather than an authorization mechanism.
  • Avoid exposing internal numeric IDs simply because UUIDs are available; choose identifiers according to your application architecture.
  • Generate a fresh UUID when a genuinely new identifier is required rather than reusing values across unrelated records.
  • Use server-side generation as well when the server is responsible for authoritative identifiers.
  • Client-side UUID generation is useful when identifiers must exist before a server request is created.

Common Uses

Generate a UUID for a new API resource.

Create UUID primary keys while preparing database seed data.

Generate identifiers for test users or test records.

Create unique client-side identifiers before submitting a form.

Generate request correlation IDs during development.

Create identifiers for distributed system messages.

Prepare a list of UUIDs for an import template.

Generate temporary identifiers for frontend prototypes.

Create unique names for application-generated objects.

Generate IDs for events, jobs or queue messages.

Create sample UUIDs for technical documentation.

Compare standard and compact UUID representations.

Worked Examples

The following examples demonstrate how this tool can be used in realistic scenarios.

Generating a Database Identifier

A developer is preparing a record that uses a UUID primary key. Generate one UUID v4 value and use the standard hyphenated representation when inserting the test record.

Generating Test Data

An automated test fixture requires 25 unique user identifiers. Set the quantity to 25 and generate the UUID list, then copy all values into the test dataset.

Creating an API Resource ID

A frontend application creates a temporary resource before synchronising with the backend. A UUID can be generated locally so the resource has an identifier immediately without waiting for a sequential database ID.

Removing Hyphens

A legacy integration expects a 32-character hexadecimal identifier without separators. Generate a standard UUID and enable the no-hyphens format to produce the compact textual representation.

Generating Correlation IDs

A developer wants unique identifiers for request tracing while testing several services. Generate multiple UUIDs and assign one to each test request so related logs can be grouped more easily.

Common Mistakes

Avoid these common mistakes to achieve the most accurate results.

  • Assuming UUID stands for a secure password or authentication credential.
  • Using UUIDs as secret access tokens simply because they appear random.
  • Assuming UUIDs are guaranteed to be mathematically impossible to duplicate.
  • Generating identifiers with weak random functions instead of cryptographically strong randomness.
  • Using inconsistent uppercase and lowercase formatting across application components without a clear convention.
  • Removing hyphens in one system while another system expects the standard UUID format.
  • Treating a compact UUID and hyphenated UUID as different identifiers when they represent the same hexadecimal value.
  • Manually editing generated UUID characters.
  • Using the same UUID repeatedly for unrelated records.
  • Assuming UUIDs always sort according to creation time.
  • Expecting UUID v4 values to provide sequential database ordering.
  • Confusing UUID v4 with timestamp-based UUID versions.
  • Assuming every database should automatically replace integer keys with UUIDs.
  • Using UUIDs without appropriate database indexing when they are heavily queried.
  • Sending invalid UUID strings to APIs that require strict UUID formatting.

Glossary

Definitions of the most important terms used by this tool.

UUID

Universally Unique Identifier, a 128-bit identifier designed so independently generated identifiers have an extremely low probability of collision.

UUID v4

UUID version 4, a UUID format based primarily on random or pseudorandom bits with defined version and variant fields.

GUID

Globally Unique Identifier, a term commonly used by Microsoft and often treated as equivalent in practice to UUID-style identifiers.

Identifier

A value used to distinguish one record, object, resource, event or other entity from another.

128-bit

A data size containing 128 binary digits. UUIDs represent a 128-bit value.

Hexadecimal

A base-16 representation using digits 0 through 9 and letters A through F. UUIDs are commonly displayed using hexadecimal characters.

Variant

A field within the UUID structure that identifies the layout and interpretation of the UUID.

Version

A field inside a UUID identifying the algorithm or construction used to create the identifier.

Random UUID

A UUID generated primarily from random data, commonly referring to UUID version 4.

Collision

A situation where two independently generated identifiers happen to contain the same UUID value.

Cryptographically Secure Random Number Generator

A random number generator designed to produce values that are difficult to predict and appropriate for cryptographic or security-sensitive randomness requirements.

Primary Key

A database field or collection of fields used to uniquely identify a record. UUIDs can be used as primary keys in many systems.

Distributed System

A system where multiple independent computers or application instances cooperate, often making decentralised identifier generation useful.

Correlation ID

An identifier attached to related requests, messages or logs so activity across multiple components can be traced as one operation.

Compact UUID

A textual UUID representation with the hyphens removed, normally producing 32 hexadecimal characters.

Frequently Asked Questions

What is a UUID?

A UUID is a 128-bit identifier designed to uniquely identify records, resources or other entities without requiring a central sequential numbering system.

What does UUID stand for?

UUID stands for Universally Unique Identifier.

What is UUID v4?

UUID version 4 is a UUID format generated primarily from random bits, with specific bits reserved to identify the UUID version and variant.

Is a UUID the same as a GUID?

The terms UUID and GUID are often used interchangeably in everyday software development. GUID is especially common in Microsoft technologies, while UUID is the standard terminology used more broadly.

What does a UUID look like?

A standard UUID is commonly displayed as 32 hexadecimal characters split into five groups using hyphens, such as 550e8400-e29b-41d4-a716-446655440000.

How long is a UUID?

The underlying UUID value is 128 bits or 16 bytes. The standard hexadecimal text representation contains 32 hexadecimal characters plus four hyphens, making 36 visible characters.

Can two UUIDs ever be the same?

A collision is theoretically possible because the number of possible identifiers is finite. However, properly generated UUID v4 values have such a large space that accidental collisions are extraordinarily unlikely for ordinary application use.

Are UUIDs random?

UUID v4 values are primarily random, although certain bits are reserved for the version and variant fields rather than being random.

Are UUIDs secure?

UUIDs are useful identifiers but should not automatically be treated as security credentials. A UUID should not replace passwords, API secrets, authentication tokens or authorization controls.

Can I use a UUID as a database primary key?

Yes. Many applications use UUIDs as database primary keys or public identifiers. Whether they are the best choice depends on database design, indexing, storage and application requirements.

Why use a UUID instead of an integer ID?

UUIDs can be generated independently by multiple clients or services without coordinating a central sequence. They can also make identifiers less predictable than simple incremental IDs, although that should not be treated as an authorization mechanism.

Can UUIDs be generated in the browser?

Yes. Modern browsers provide cryptographically strong random functionality suitable for UUID v4 generation, including crypto.randomUUID() in supported environments.

What does removing UUID hyphens do?

Removing the hyphens changes only the textual representation. The same 128-bit identifier is represented by the remaining 32 hexadecimal characters.

Does uppercase change a UUID?

No. Hexadecimal letters are case-insensitive, so uppercase and lowercase forms represent the same UUID value when interpreted correctly.

Why does UUID v4 contain a 4 in a specific position?

The UUID format reserves specific bits for the version field. In UUID v4, those bits identify the value as version 4, which appears as a hexadecimal 4 in the standard representation.

Are UUID v4 values sequential?

No. UUID v4 values are random rather than ordered by creation time. Applications needing time-ordered UUIDs may consider other UUID versions such as UUID v7.

What is UUID v7?

UUID v7 is a newer UUID format that incorporates a Unix timestamp and random data, making generated identifiers roughly sortable by creation time. This initial SwiftVecto generator focuses on UUID v4.

Can I generate multiple UUIDs at once?

Yes. The SwiftVecto UUID Generator is designed to create a single UUID or a bulk list of up to 100 identifiers in one operation.

Can I copy all generated UUIDs together?

Yes. Bulk output can be copied as a newline-separated list for use in development, testing and data preparation.

Can I download generated UUIDs?

Yes. Generated UUIDs can be saved as a plain text list for use outside the browser.

Does SwiftVecto send generated UUIDs to the server?

The interactive UUID Generator is designed to generate UUIDs directly inside your browser, so normal generation does not require a file upload or server-side processing request.

Is this UUID Generator free?

Yes. SwiftVecto provides this developer utility for generating UUID v4 identifiers online.

Things to Know

  • The initial version of this tool generates UUID version 4 identifiers.
  • UUID v4 values are 128 bits or 16 bytes.
  • The standard UUID text representation contains 32 hexadecimal characters and four hyphens.
  • A standard hyphenated UUID contains 36 visible characters.
  • Removing hyphens produces a 32-character hexadecimal representation.
  • Uppercase and lowercase UUIDs represent the same value.
  • Bulk generation is limited to 100 UUIDs per operation in the initial version.
  • UUIDs are identifiers and should not be treated as passwords or access tokens.
  • Normal interactive generation is intended to happen directly inside the browser.
  • Future SwiftVecto versions may support additional UUID versions such as UUID v7.

Disclaimer

UUIDs provide identifiers rather than authentication or authorization security.

Do not use generated UUIDs as a substitute for securely generated passwords, API secrets or access tokens.

Although accidental UUID v4 collisions are extraordinarily unlikely when generated correctly, uniqueness should not be interpreted as a mathematical absolute guarantee.

Application developers remain responsible for appropriate database constraints, validation and identifier-handling practices.

Use the UUID format and storage strategy appropriate to your application, database and interoperability requirements.

Official References

The following official resources were used when developing this tool and are useful for further reading.

RFC 9562 - Universally Unique IDentifiers (UUIDs)

https://www.rfc-editor.org/rfc/rfc9562

MDN Web Docs - Crypto.randomUUID()

https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID

MDN Web Docs - Crypto.getRandomValues()

https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues

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