ID Generator

UUID Generator

Instantly create universally unique identifiers for your applications, APIs, and databases. Choose between standard random UUID v4 or the modern, time-ordered UUID v7, and easily format your bulk output to match your system's exact requirements.

100% FreeNo Account RequiredUUID v4 & v7Bulk GenerationCustom Formatting

Understanding UUID v4 vs UUID v7

Not all UUIDs are created equal. For years, the standard has been the UUID v4 generator, which relies entirely on secure random numbers. Because they are completely random, v4 identifiers are excellent for hiding the creation time or sequence of records, making them a popular choice for public-facing API tokens and session IDs.

However, randomly generated IDs can cause severe performance degradation in relational databases due to index fragmentation. This is where the modern UUID v7 generator excels. UUID v7 combines a Unix timestamp with random data, resulting in a time-ordered unique identifier. This means your database can sort and index these records sequentially, dramatically improving insert performance while maintaining global uniqueness.

If you are using UUIDs as primary keys in a relational database like PostgreSQL or MySQL, strongly consider selecting UUID v7.

Comparison: UUID v4 vs UUID v7

A quick reference guide to help you choose the correct UUID version for your specific use case.

Feature	UUID v4	UUID v7
Generation Method	Completely random	Time-based (Unix Epoch) + Random
Database Insert Performance	Slower (causes index fragmentation)	Faster (naturally sequential)
Sortability	Cannot be sorted chronologically	Chronologically sortable by default
Primary Best Use Case	API keys, session tokens, hidden URLs	Database primary keys, logs, events

Both versions provide an incredibly low probability of collision, ensuring safe global uniqueness.

Create Reliable Identifiers for Distributed Systems

In modern software development, relying on sequential database IDs often leads to security vulnerabilities and scaling bottlenecks. A UUID (Universally Unique Identifier) solves this by providing a 128-bit label that is statistically guaranteed to be globally unique. Our online UUID generator is designed specifically for developers who need to quickly generate these values for database records, API request tracing, or populating test environments.

Whether you need a single random guid generator or a bulk uuid generator to produce dozens of records simultaneously, this tool offers complete flexibility. You can customize the exact format by choosing between lowercase and uppercase outputs, or generating a compact UUID without hyphens to satisfy strict schema requirements.

All generated UUID values are created securely within the backend and are safe for production database use.

Practical Use Cases

Real-world workflows where this tool shines.

Database Primary Keys

Generate UUID v7 values to use as fast, sortable, and globally unique primary keys in modern relational database schemas.

Test Data Creation

Use the bulk generation feature to quickly produce dozens of random identifiers to populate mock APIs and test fixtures.

API Request Tracing

Create standard v4 UUIDs to attach to microservice requests as trace IDs, ensuring logs can be followed across distributed systems.

Who This Is For

The people and teams this tool is especially useful for.

Backend Developers

For software engineers building RESTful APIs and distributed systems requiring collision-free identification.

Database Administrators

For DBAs looking to migrate from sequential integers to performant, time-ordered v7 unique keys.

QA Engineers

For testers who need to quickly copy unique values to validate edge cases and database insert behavior.

How to Generate UUIDs Online

Follow these simple steps to quickly create and format single or bulk unique identifiers for your projects.

Choose UUID Version

Select UUID v4 for standard, fully random identifiers, or select UUID v7 if you need time-ordered identifiers for a database.

Set Quantity

Choose how many IDs you need to generate. You can request a single ID or configure the bulk generator up to 100 items.

Pick Formatting Options

Enable uppercase mode or check the 'no hyphens' option if your target system requires a specific 32-character or capitalized format.

Generate and Copy

Click the generate button. Review your list of newly created unique identifiers and copy them into your clipboard for immediate use.

Why Use Our UUID Maker

Built for developers, our online UUID generator simplifies the creation of reliable database IDs, API tokens, and test records.

Modern v7 Support

Stay up to date with modern database practices by utilizing the time-ordered UUID v7 format for optimized indexing.

Bulk Generation Capable

Need to populate a test database? Instantly generate multiple uuids at once, up to 100 unique records per click.

Flexible Output Formatting

Toggle between standard formatting, uppercase strings, or a compact uuid no dashes format to match your API schema.

Developer Friendly

A clean, ad-free interface designed to generate random IDs for development quickly, with easy one-click copying.

Frequently Asked Questions

Learn more about the differences between UUID versions, bulk generation, formatting options, and database best practices.

UUID v4 is entirely random, generated using cryptographically secure pseudorandom numbers. UUID v7, introduced in a newer RFC, incorporates a timestamp followed by random data. This makes v7 values naturally time-ordered and sortable, which is highly beneficial for database indexing.

You should use a UUID v7 generator when the identifier will be used as a primary key in a relational database (like PostgreSQL, MySQL, or SQL Server). Because v7 is time-sequential, it prevents the severe index fragmentation that random v4 UUIDs cause during heavy insert operations.

Yes. Our bulk UUID generator allows you to create multiple identifiers simultaneously. Simply set your desired quantity in the form (up to a maximum of 100), and the tool will instantly output a list of unique values ready to be copied.

Absolutely. UUIDs are widely considered safe and are the standard for distributed database systems. Because they do not rely on a central server to increment sequentially, they prevent attackers from guessing the volume of your data or accessing other records by simply changing a number in a URL.

A standard UUID contains 36 characters (32 alphanumeric characters and 4 hyphens). Some older databases, APIs, or specific string column formats prefer exactly 32 characters to save space or bypass validation strictness. Our tool allows you to easily generate a UUID without hyphens for these exact scenarios.

Practically, yes. GUID stands for Globally Unique Identifier, which is simply Microsoft's implementation and terminology for the UUID standard. A guid generator online will produce the exact same formatted 128-bit string as a standard UUID generator.

Yes. The official RFC specifies that UUIDs should be output in lowercase characters. However, many enterprise systems, legacy databases, and C# environments require uppercase GUIDs. You can use the uppercase uuid generator toggle in our tool to instantly convert the output.

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