Generate random UUID version 4 (UUID v4) identifiers instantly with Nimzoa's free online UUID generator. Create one or up to 500 UUIDs at once, choose uppercase or lowercase output, remove hyphens, and copy or download the results. No account required.
01 / GENERATION SETTINGS
UUIDs are generated only when you choose Generate or Regenerate. Changing quantity does not change existing results; formatting updates them without regenerating.
02 / YOUR UUIDS
0 UUIDs generated
Choose a quantity and generate UUIDs to see them here.
UUIDs are generated locally with your browser’s secure random source. They are not uploaded or stored.
How it works
Choose the supported file from your device.
Use the available settings for the result you need.
Save the completed file directly to your device.
Enter the number of UUIDs you need, from 1 to 500. Choose lowercase or uppercase formatting and optionally enable Remove Hyphens. Click Generate UUIDs to create your identifiers. Copy an individual UUID, copy all results, or download a TXT file. Use Regenerate UUIDs whenever you need a fresh batch.
Generate UUID v4 identifiers without installing software or writing code. Create up to 500 IDs per batch, choose uppercase or lowercase output, remove hyphens, and copy or download the results. Generation uses your browser's secure random-number capabilities, with no account required.
UUID generation takes place locally in your browser. Generated identifiers are not uploaded to Nimzoa's application servers or stored as generation records by the tool. General website analytics are separate from generated values.
A UUID generator creates Universally Unique Identifiers used for software records, objects, and resources. Nimzoa generates random UUID version 4 (UUID v4) values directly in your browser.
Yes. Nimzoa generates UUID v4 identifiers using your browser's secure random number capabilities. The tool currently supports version 4 only, not UUID v1, v5, or v7.
Yes. Enter a quantity from 1 to 500 to generate multiple UUID v4 identifiers in one batch. You can copy all the results or download them as a TXT file.
No. UUIDs are generated locally in your browser and are not uploaded to Nimzoa's application servers or stored as generation records by the tool.
Yes. Enable Remove Hyphens to display a compact 32 character hexadecimal UUID instead of the standard 36-character hyphenated format. The underlying identifier remains unchanged.
Yes. Select Uppercase in the output settings. Uppercase and lowercase UUID strings represent the same identifier, although some applications may require a particular text format.
UUID means Universally Unique Identifier, while GUID means Globally Unique Identifier. The terms often refer to the same 128-bit identifier format, particularly in Microsoft development environments. Nimzoa generates standard UUID v4 values.
Yes, a collision is theoretically possible. However, correctly generated UUID v4 values have an extremely large random space, making accidental duplicates very unlikely. Use database uniqueness constraints where strict uniqueness is required.
Need a UUID for a database record, API test, application, or development project? Nimzoa's free online UUID generator creates random UUID version 4 (UUID v4) identifiers directly in your browser.
Generate one UUID or create a batch of up to 500 at once. Choose lowercase or uppercase letters, remove hyphens for a compact format, and copy or download your results.
No account or software installation is required. UUIDs are generated locally using your browser's secure random-number capabilities.
Follow these steps to generate UUIDs online:
Choose the quantity. Enter a number from 1 to 500.
Select the output case. Choose lowercase or uppercase hexadecimal letters.
Choose the format. Keep the standard hyphens or enable Remove Hyphens.
Generate UUIDs. Click Generate UUIDs to create your identifiers.
Copy or download. Copy a single UUID, copy all generated values, or download a TXT file.
Use Regenerate UUIDs to create a fresh batch.
Changing the display format does not change the underlying identifier or generate a new one.
UUID stands for Universally Unique Identifier. It is a standardized 128 bit identifier commonly used to identify records, objects, requests, and resources in software systems.
UUIDs can be generated independently by different applications without asking a central server to assign the next sequential number.
A standard UUID is written as 32 hexadecimal characters divided into five groups with hyphens.
Example:
550e8400-e29b-41d4-a716-446655440000
The groups follow an 8-4-4-4-12 pattern, giving a total of 36 characters including the four hyphens.
UUIDs are designed to make accidental duplication extremely unlikely, but they are not guaranteed to be globally unique.
A UUID v4 generator creates version 4 UUIDs using random values.
Each UUID contains 128 bits. Six bits are reserved for version and variant information, leaving 122 random bits in a standard UUID v4.
Nimzoa uses your browser's secure random-number capabilities to generate these identifiers.
Version 4 UUIDs are useful when you need random-looking identifiers that can be created independently for software development, database records, or testing.
Consider this example:
550e8400-e29b-41d4-a716-446655440000
The first character of the third group is 4, indicating version 4.
The first character of the fourth group is one of 8, 9, a, or b, identifying the standard UUID variant.
These patterns are part of the UUID format defined by RFC 9562.
When preparing test data or sample records, generating identifiers individually can take unnecessary time.
Nimzoa's bulk UUID generator lets you create up to 500 UUID v4 values per batch.
This can help when you need IDs for:
Sample database rows
API development and testing
Automated test fixtures
Prototype applications
Example records and datasets
Software demonstrations
After generation, use Copy All to collect the results or download them as a TXT file.
If you need more than 500 UUIDs, you can generate additional batches.
Different applications may expect different textual representations of UUIDs.
Nimzoa provides formatting controls without changing the underlying UUID value.
Lowercase is the conventional text representation.
Example:
550e8400-e29b-41d4-a716-446655440000
Some systems, documents, and development workflows display UUIDs using uppercase hexadecimal letters.
Example:
550E8400-E29B-41D4-A716-446655440000
Uppercase and lowercase versions represent the same identifier.
A standard UUID has 36 characters, including four hyphens.
Removing the hyphens produces a compact 32-character hexadecimal representation.
Example:
550e8400e29b41d4a716446655440000
The underlying 128-bit value stays the same, but some applications require the hyphenated format. Check the receiving system's requirements before using a compact UUID.
UUID means Universally Unique Identifier, while GUID means Globally Unique Identifier.
The terms are often used interchangeably, particularly in software development involving Microsoft technologies.
A GUID commonly uses the same familiar 128-bit identifier structure as a UUID. Some Microsoft tools display GUIDs in uppercase or surround them with braces.
For example:
{550E8400-E29B-41D4-A716-446655440000}
Nimzoa generates UUID v4 values and supports uppercase formatting and optional hyphen removal. It does not currently provide an automatic braces option.
If your application accepts standard UUID v4 values as GUIDs, you can use the generated identifiers in that workflow.
UUID versions are designed for different requirements.
Feature | UUID v4 | UUID v7 |
|---|---|---|
Main structure | Random-based | Timestamp-based with random components |
Typical appearance | Random-looking | Partly time-ordered |
Generation | Does not require a timestamp in the UUID | Includes a timestamp |
Common use | General-purpose identifiers | Time-ordered identifiers and some database workloads |
Available in Nimzoa | Yes | No |
UUID v7 can offer advantages for certain database indexing patterns because its values are designed to sort approximately by creation time.
UUID v4 remains useful for general-purpose random identifiers.
Nimzoa currently generates UUID version 4 only.
UUIDs can identify records without depending on a single database sequence.
For example, an application may assign UUIDs to customers, orders, or project records.
Databases should still enforce uniqueness when duplicate identifiers would cause problems.
Developers often need sample identifiers for API requests, response examples, and resource URLs.
A UUID generator makes it easy to create realistic test identifiers without writing additional code.
UUIDs can be useful for automated tests, fixtures, and sample datasets.
Creating multiple UUIDs helps avoid accidentally reusing the same identifier across test records.
Separate services can generate UUIDs independently without coordinating every identifier through one central counter.
This is one reason UUIDs are common in distributed systems.
When building an application interface or preparing a demonstration, UUIDs can serve as sample record IDs.
They are especially useful when a system expects identifiers in UUID format.
No. UUID v4 uniqueness is based on probability.
With 122 random bits, the number of possible random combinations is extremely large, making accidental collisions very unlikely when identifiers are generated correctly.
However, collisions remain mathematically possible.
For systems that require strict uniqueness, use appropriate database constraints and application validation.
A UUID should also not be treated as an authentication credential. Use dedicated security mechanisms for passwords, access tokens, and sensitive authorization.
UUID hexadecimal text can contain the digits 0–9 and the letters a–f.
Uppercase and lowercase letters represent the same hexadecimal values.
For example:
550e8400-e29b-41d4-a716-446655440000
and
550E8400-E29B-41D4-A716-446655440000
represent the same UUID.
Some applications may compare raw text differently, so normalize the representation or use a proper UUID data type when appropriate.
Nimzoa generates UUID v4 identifiers locally in your browser.
The tool uses secure browser random-number capabilities rather than relying on an ordinary predictable random-number function.
Generated identifiers are not uploaded to Nimzoa's application servers for generation or stored as tool-generated records.
You can copy or download the results directly from your browser.
This statement applies to UUID generation. General website analytics and other site data practices are described separately in Nimzoa's Privacy Policy.
A UUID and a password serve different purposes.
A UUID is primarily an identifier used to distinguish a record, object, or resource.
A password or security token is intended to help protect access.
Although UUID v4 uses secure random generation, it should not automatically be treated as a password, API secret, or session credential.
If you need a password rather than an identifier, use a dedicated Password Generator.
Nimzoa provides a simple way to generate UUID v4 identifiers without installing software or creating an account.
The tool supports:
Random UUID v4 generation
Batches of 1 to 500 identifiers
Lowercase and uppercase output
Standard and no-hyphen formats
Individual copying and Copy All
TXT file downloads
Regeneration of new UUID values
Local browser-based generation
These features make the tool useful for developers, testers, students, and anyone preparing software identifiers.
Choose the quantity and output format in the UUID Generator above, then click Generate UUIDs.
Copy individual identifiers, copy the complete batch, or download your results as a TXT file.
Nimzoa's free online UUID generator is ready whenever you need random UUID v4 identifiers for development or testing.