UUID Generator

Generate UUID values for apps and testing.

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Generate UUID values for apps and testing.

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Tool guide

Free UUID v4 Generator

Generate one or many RFC-style UUID v4 values in your browser. This UUID and GUID generator uses crypto.randomUUID when available or a crypto.getRandomValues v4 fallback, and can create up to 100 lowercase, hyphenated IDs at a time.

Steps

How it works

Choose a quantity from 1 to 100.
Generate UUID v4 values with the browser cryptography API.
Copy the generated list when needed.
Download all generated UUIDs in one TXT file.

Highlights

Key features

Generates version 4 UUID values.
Uses crypto.randomUUID or a Web Crypto random-byte fallback.
Creates up to 100 UUIDs in one operation.
Produces standard lowercase values with hyphen separators.
Supports copy and plain-text download.

Use cases

Common uses

Create identifiers for fixtures and mock data.
Generate request, record, or component IDs during development.
Prepare UUID lists for database or API testing.
Create GUID-style sample values for cross-platform tests.

Notes

Limitations to know

UUID v7 and other UUID versions are not available.
Uppercase output and hyphen removal options are not implemented.
UUIDs have an extremely low collision probability, not an absolute uniqueness guarantee.
Generated values are random rather than sequential and are not checked against a database.
UUIDs are identifiers, not passwords, encrypted values, or authentication secrets.

FAQ

Frequently asked questions

6 answers

Which UUID version does this generator create?

It creates UUID version 4 values using browser cryptographic randomness.

Is UUID v7 supported?

No. The current tool generates UUID v4 only.

Are UUIDs guaranteed to be unique?

No random identifier can provide an absolute guarantee, but properly generated UUID v4 collisions are extremely unlikely.

Can I generate UUIDs in bulk?

Yes. Generate between 1 and 100 UUIDs at once.

Can I remove hyphens or use uppercase UUIDs?

No. The current output is lowercase and hyphenated.

Can UUIDs be used as secure tokens or passwords?

They should be treated as identifiers, not as passwords or authorization secrets.