UUID Generator

Generate random UUID v4 identifiers using the browser crypto API for databases, tests, APIs, and correlation IDs.

For this tool, processing runs locally in your browser and data is not sent to the server.

UUID Generator is a free online tool that creates random UUID v4 identifiers using the browser's crypto API. It is useful for database record IDs, test entities, mock data, request IDs, correlation IDs, event logs, and API integrations. The tool runs locally in your browser and does not send data to the server.

What it does

Output

Processing

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How to use

Set the number of UUIDs to generate.
Choose an output format: line-by-line, comma-separated, JSON array, or SQL IN list.
Optionally enable uppercase, remove hyphens, or add a prefix.
Click Generate and copy the UUIDs for use in a database, tests, API, request ID, or correlation ID.

More about this tool

UUID Generator creates random UUID v4 identifiers in the browser using the crypto API. UUIDs are commonly used as identifiers for database records, test entities, mock data, request IDs, correlation IDs, events, logs, and API integrations.

You can generate one or multiple UUIDs at once, choose an output format (line-by-line, comma-separated, JSON array, or SQL IN list), switch between uppercase and lowercase, strip hyphens, or add a custom prefix.

All generation is done locally in your browser. No data is sent to the server.

Runs in the browser
Data is not sent to the server
Generates UUID v4 using the browser crypto API
Supports generating one or multiple UUIDs
Output formats for JSON and SQL
Can remove hyphens or change letter case
Useful for databases, APIs, tests, and correlation IDs
No registration required

Frequently Asked Questions

What is UUID v4?

UUID v4 is a randomly generated universal identifier. It is commonly used for database records, test data, request IDs, correlation IDs, and API integrations.

How do I generate a UUID?

Set the number of UUIDs, choose an output format, and click Generate. The result can be copied with one click.

Can I generate multiple UUIDs at once?

Yes. You can specify a count and receive the list as line-by-line, comma-separated, JSON array, or SQL IN list.

What random source is used?

The tool uses the browser crypto API: crypto.randomUUID() with a secure fallback to crypto.getRandomValues. Math.random is not used.

Can I remove hyphens from the UUID?

Yes. You can enable a no-hyphen format to get a compact 32-character string.

Is UUID suitable for use as a database primary key?

Yes. UUID v4 is often used as a record identifier. However, choosing it as a primary key depends on your database architecture and requirements.

Does UUID guarantee absolute uniqueness?

UUID v4 has an extremely low probability of collision, but it is a random identifier, not a database-level check. For application-level guarantees, use a unique index in your database.

Is my data sent to the server?

No. UUIDs are generated locally in the browser and are not sent to the server.

Do I need to register?

No. The tool works immediately without registration.

More about this tool

All generation is done locally in your browser. No data is sent to the server.

Runs in the browser
Data is not sent to the server
Generates UUID v4 using the browser crypto API
Supports generating one or multiple UUIDs
Output formats for JSON and SQL
Can remove hyphens or change letter case
Useful for databases, APIs, tests, and correlation IDs
No registration required

Frequently Asked Questions

What is UUID v4?

UUID v4 is a randomly generated universal identifier. It is commonly used for database records, test data, request IDs, correlation IDs, and API integrations.

How do I generate a UUID?

Set the number of UUIDs, choose an output format, and click Generate. The result can be copied with one click.

Can I generate multiple UUIDs at once?

Yes. You can specify a count and receive the list as line-by-line, comma-separated, JSON array, or SQL IN list.

What random source is used?

The tool uses the browser crypto API: crypto.randomUUID() with a secure fallback to crypto.getRandomValues. Math.random is not used.

Can I remove hyphens from the UUID?

Yes. You can enable a no-hyphen format to get a compact 32-character string.

Is UUID suitable for use as a database primary key?

Yes. UUID v4 is often used as a record identifier. However, choosing it as a primary key depends on your database architecture and requirements.

Does UUID guarantee absolute uniqueness?

UUID v4 has an extremely low probability of collision, but it is a random identifier, not a database-level check. For application-level guarantees, use a unique index in your database.

Is my data sent to the server?

No. UUIDs are generated locally in the browser and are not sent to the server.

Do I need to register?

No. The tool works immediately without registration.