What is a GUID generator?

A GUID generator creates a new globally unique identifier, usually in UUID format. It is used when software needs an ID that can be created independently across services, devices, or databases.

Is a GUID the same as a UUID?

In everyday development, GUID and UUID usually refer to the same 128-bit identifier format. GUID is common in Microsoft ecosystems, while UUID is the standards-oriented term.

Which UUID version should I use in a GUID generator?

Use UUID v4 for a random GUID in most projects. Use UUID v7 when you want identifiers that sort by creation time, especially for database-heavy workloads.

Are generated GUIDs uploaded?

No. This page generates and validates GUIDs locally in your browser, so the values do not need to be sent to a server for normal use.

Can a GUID generator create duplicates?

A correctly generated random UUID has an extremely low collision probability. Applications should still enforce a unique constraint when a GUID is used as a database key.

GUID Generator - Free Online UUID Tool

Version

Count 1-1000

Format

Encoding

Separator + Newline

Uppercase output

Auto-gen Interval (ms)

Results

Shortcuts: G = generate - C = copy

Auto-copy

Export follows current format and encoding settings

Smart Parser and Bulk Validator

GUID Generator Examples for Developers

Use the generated value directly in your preferred environment. These examples are intentionally short so you can adapt them to application IDs, test fixtures, seed data, and request correlation.

GUID generator in C#

var id = Guid.NewGuid();

GUID generator in JavaScript

const id = crypto.randomUUID();

GUID generator in SQL Server

SELECT NEWID() AS guid;

GUID generator in PowerShell

[guid]::NewGuid()

GUID Generator for Developers and Testers

This GUID generator creates globally unique identifiers for software projects, database rows, API requests, test fixtures, configuration files, and distributed systems. A GUID, also called a UUID, is a 128-bit identifier written most often in the standard 8-4-4-4-12 hexadecimal format, such as f47ac10b-58cc-4372-a567-0e02b2c3d479. Developers use GUIDs when an object needs a durable identifier that can be generated without asking a central server for the next number.

The tool is designed as a practical online GUID generator rather than a reference-only article. Choose a UUID version, set the count, pick the output format, and click Generate. The result appears immediately in the text area so you can copy it into source code, JSON payloads, SQL scripts, logs, spreadsheets, or issue trackers. For batch work, increase the count up to 1,000 and export the generated GUID list as TXT, CSV, or JSON.

Generation runs locally in your browser. Random versions use the browser cryptographic API, and generated identifiers are not uploaded to this website. That makes the generator suitable for everyday engineering tasks where privacy matters: staging data, internal tooling, temporary records, sample payloads, and one-off identifiers for scripts. You should still avoid publishing secrets, credentials, or personally identifiable data inside any identifier value, because a GUID should identify a record, not store sensitive information.

How to Use This GUID Generator

For most projects, select UUID v4, keep the standard hyphenated format, and generate the number of identifiers you need. UUID v4 is random, widely supported, and the safest default when you simply need a new GUID with no embedded meaning. If your database benefits from time-ordered keys, try UUID v7. Version 7 preserves the convenience of UUIDs while sorting more naturally by creation time, which can reduce index fragmentation in some storage engines.

The format controls how the identifier is wrapped or displayed. Standard hyphenated GUIDs are best for APIs, logs, and most programming languages. No-hyphen output is useful when a system expects 32 hexadecimal characters. Braces and parentheses match conventions found in some Microsoft, COM, registry, and configuration contexts. Encoding options let you convert the same UUID bytes into HEX, binary, byte array, Base64, URL-safe Base64, or a URN such as urn:uuid:....

The separator setting helps when you generate more than one identifier. Use newline output for plain lists, comma output for inline code, JSON Array for fixtures, and SQL Insert when preparing database seed scripts. Uppercase output is available for systems that store identifiers in capital letters. Auto-generate and auto-copy are convenience options for repetitive testing, but for production migrations it is usually better to generate a fixed list once, review it, and commit it with the related change.

Which UUID Version Should You Choose?

UUID v4 is the common choice for a random GUID generator because it has no dependency on time, machine address, namespace, or external state. It is appropriate for public IDs, request IDs, temporary entities, file names, and records created across multiple services. UUID v1 combines timestamp information with node data, so it can be useful for compatibility with older systems, but it may reveal timing details. UUID v3 and UUID v5 create deterministic identifiers from a namespace and name; use them when the same input should always produce the same UUID.

UUID v7 is useful when identifiers are inserted into databases at high volume. Because v7 includes a timestamp component, new values tend to sort near other new values. That can make indexes friendlier than purely random values while keeping the familiar UUID shape. UUID v8 is reserved for custom layouts. It should be used only when you understand the receiving system's expectations and have a clear reason to define custom identifier bits.

GUID Validation, Parsing, and Format Conversion

The validator below the generator accepts a single GUID or a larger block of text. Paste logs, JSON, CSV content, error messages, or copied database rows, and the parser extracts valid UUID values. For one identifier, it shows the version, variant, standard format, URN form, and extracted time when the UUID version supports time parsing. For many identifiers, it shows a bulk table so you can scan the versions and standardize the values before reusing them.

Validation is helpful when data has moved through several systems and the original formatting is no longer consistent. Some tools remove hyphens, some wrap GUIDs in braces, and others store UUID bytes as Base64. This page helps normalize those values into a standard format so they can be compared, copied, or exported reliably. If a value fails validation, check its length, characters, version nibble, and whether extra punctuation was copied with it.

Privacy and Reliability Notes

This free GUID generator is built for quick access and repeatable utility. It does not require a login, and the generated values are produced client-side. Browser-based generation is convenient for development, QA, documentation, and test data. For security-sensitive production systems, generate identifiers inside the application or database that owns the data so audit trails, transactions, and retry behavior remain under your control.

GUID collisions are mathematically unlikely when random UUIDs are generated correctly, but uniqueness also depends on how identifiers are stored and compared. Treat GUID columns as unique, normalize casing where your database is case-sensitive, and keep one canonical string format for APIs. A good GUID generator gives you clean values; a good system still enforces uniqueness at the data layer.

Common GUID Generator Use Cases

Create random UUID v4 values for application records, request IDs, cache keys, and feature flags.
Generate batch GUID lists for QA datasets, load tests, seed files, and mock API responses.
Convert UUIDs between standard, no-hyphen, byte array, Base64, URL-safe Base64, and URN formats.
Validate identifiers copied from logs, JSON payloads, SQL exports, issue reports, and configuration files.
Prepare time-ordered UUID v7 values for systems where insert order and index locality matter.