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UUID Generator

Generate UUID v4 values locally in your browser for request IDs, idempotency keys, database records, and test data.

Runs locally in your browser

UUID Generator

Generate random UUID v4 values for request IDs, idempotency keys, test data, and API examples.

UUIDs are generated locally with browser cryptographic randomness.

What this UUID Generator is for

Use this UUID Generator when you need random UUID v4 values for request IDs, idempotency keys, database seed data, test fixtures, local scripts, or API examples.

The generator runs in your browser. It does not upload generated IDs, copy actions, or usage data to a server.

How to use it

Choose how many UUIDs to generate, choose the output format, then click Generate UUIDs.

The standard format is lowercase and hyphenated:

7b3f6b6d-1f8d-48d5-9c5a-2a6f7f4d6c52

Compact format removes hyphens when you need a shorter string for logs, filenames, or systems that do not accept separators.

UUIDs and backend systems

UUIDs are useful for uniqueness, but they are not authorization. Treat them as identifiers, not secrets.

For idempotency keys, scope the UUID to the authenticated user, account, endpoint, or operation so one actor cannot collide with another actor’s workflow.

Read Idempotency in APIs Explained for retry-safe request design and REST API Status Codes Explained for response patterns around conflicts and request IDs. Use the Unix Timestamp Converter when checking logs around generated IDs.

FAQ

UUID Generator questions

Does this UUID Generator upload generated IDs?

No. UUID generation runs locally in your browser, and generated values are not sent to a server.

What UUID version does this tool generate?

It generates random UUID v4 values using browser cryptographic randomness when available.

Can I use these UUIDs as idempotency keys?

UUID v4 values are a common choice for idempotency keys and request IDs, but your backend should still scope and validate them.

Can I generate UUIDs without hyphens?

Yes. Use the format selector to generate standard hyphenated UUIDs or compact UUIDs without hyphens.