UUID Generator - Free & No Account Required

Create secure random UUID v4 or time-sortable UUID v7 values directly in your browser. Generate a single identifier or a complete batch without uploads, tracking, or external libraries.

Generate UUIDs See how it works
Web Crypto randomness Up to 1,000 UUIDs UUID v4 and v7 Copy and download

UUID Generator

Select a UUID version, choose how many values you need, and customize the output format.

100% local processing

Generation settings

UUID v4
Tip: press Ctrl/⌘ + Enter to generate

UUID inspector

Optional

Validate a standard hyphenated UUID or an exact 32-character hexadecimal UUID.

Enter a UUID to inspect its structure.

Inspection result

Waiting
01
Private by design Identifiers stay in your browser
02
Secure randomness Native Web Crypto API
03
Batch generation Create up to 1,000 UUIDs
04
Flexible export Lines, commas, or JSON
Unique identifiers

Generate UUIDs securely in your browser

This UUID Generator creates standards-based 128-bit identifiers without contacting a remote server. It supports random UUID v4 values and timestamp-based UUID v7 values.

UUIDs are commonly used for database records, distributed systems, API resources, session references, event identifiers, filenames, test data, and application entities.

Private local UUID generation

The generator does not upload UUIDs, save them in browser storage, or send analytics containing generated values. Results remain in page memory until you clear them, leave the page, or close the browser tab.

Useful capabilities

A focused UUID generation workflow

Generate, format, inspect, copy, and export UUIDs without unnecessary configuration or external dependencies.

Web Crypto randomness

UUID random fields are generated with crypto.getRandomValues, not a predictable pseudo-random helper.

Large UUID batches

Generate up to 1,000 identifiers in one action with duplicate protection inside the generated batch.

Flexible formatting

Switch between lowercase and uppercase output, retain standard hyphens, or create compact hexadecimal strings.

Copy and download

Copy individual values or complete batches and download newline, comma-separated, or JSON output.

UUID inspection

Validate UUID text and identify its version, variant, normalized representation, and UUID v7 timestamp.

Responsive results

Long batches remain inside a bounded, touch-friendly result panel on mobile and desktop.

Three simple steps

How to generate UUIDs online

No package installation, account, API request, or server upload is required.

01

Select UUID v4 or v7

Choose random UUID v4 for general identifiers or UUID v7 when approximate creation-time ordering is useful.

02

Configure the batch

Set a quantity, letter case, hyphen preference, and output format for copying or downloading.

03

Generate and export

Create the UUID batch locally, copy individual values, or export the full result.

Version comparison

UUID v4 vs UUID v7

Both versions are 128-bit UUIDs but use different layouts and provide different ordering characteristics.

Property
UUID v4
UUID v7
Primary data
Cryptographically secure random data
Unix millisecond timestamp and random data
Random bits
122 random bits
74 random bits
Ordering
No creation-time ordering
Broadly sortable by millisecond timestamp
Typical use
General-purpose distributed identifiers
Databases, events, and time-oriented records
Implementation guidance

UUID best practices

Use UUIDs as identifiers while preserving appropriate application, database, and security controls.

1

Store UUIDs consistently

Prefer a native UUID database type or a consistent 16-byte binary representation where supported.

2

Do not treat UUIDs as secrets

A hard-to-guess identifier is not a replacement for authentication, authorization, or access controls.

3

Use standard formatting

Lowercase hyphenated UUIDs provide the broadest readability and interoperability across systems.

4

Understand UUID v7 ordering

UUID v7 values sort by timestamp, but random values generated within the same millisecond need not preserve exact generation order.

Common questions

UUID Generator FAQ

What is a UUID?

A UUID is a 128-bit identifier designed to be unique across systems without requiring a central numbering authority. Its standard text form contains 32 hexadecimal characters displayed in five groups.

What is the difference between UUID v4 and UUID v7?

UUID v4 is based primarily on random data and contains 122 random bits. UUID v7 begins with a Unix millisecond timestamp and contains 74 random bits, making values broadly sortable by creation time.

Are these UUIDs generated securely?

Yes. UUID v4 and UUID v7 random fields are generated with the browser Web Crypto API through crypto.getRandomValues. The generator does not use Math.random.

Are generated UUIDs uploaded or stored?

No. UUID generation, formatting, copying, downloading, and inspection happen locally in your browser. This page does not upload or save the generated identifiers.

Can two generated UUIDs be identical?

A collision is theoretically possible but extraordinarily unlikely when UUIDs are generated correctly. This tool also checks for duplicates within each generated batch before displaying it.

Do uppercase letters or removed hyphens change a UUID?

No. Hexadecimal letter case and display hyphens do not change the underlying 128-bit UUID value. Some software may still require the standard lowercase hyphenated representation.

Does UUID validation prove that an identifier is trustworthy?

No. Validation confirms the UUID text structure and reports its version and variant. It cannot prove who generated the UUID, whether it is registered, or whether associated data should be trusted.

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Ready to generate secure UUIDs?

Create one UUID or a batch of 1,000 UUID v4 or UUID v7 values privately in your browser.

Generate UUIDs now