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UUID Generator
Generate UUID v4 in bulk
Everything runs locally in your browser. Your data never leaves your device.
About this tool
Generate cryptographically random UUID version 4 identifiers using your browser’s crypto API. Create one ID or many at once, with options for uppercase and hyphen stripping.
Ideal for primary keys in prototypes, request IDs, idempotency keys, and test fixtures, generated privately on your device.
How to use it
- Choose how many UUIDs you want to generate.
- Optionally enable uppercase or remove hyphens.
- Click Generate to create new identifiers.
- Copy one UUID or the full batch to your clipboard.
Common use cases
- Create database or document IDs while prototyping.
- Generate idempotency keys for API requests.
- Seed test data with unique identifiers.
- Assign correlation IDs for local debugging sessions.
Frequently asked questions
Which UUID version is this?
Version 4 (random), following RFC 4122, using the Web Crypto API.
Are UUIDs uploaded or stored?
No. They are generated locally and never sent to our servers.
Can I generate many at once?
Yes. Use the count option to create a batch for seeding or bulk testing.
Are these suitable for security tokens?
UUIDv4 is fine for unique IDs. For secrets, prefer dedicated random token generators with sufficient entropy for your threat model.
Will I get collisions?
Collisions are astronomically unlikely for UUIDv4 in normal use.