UUID Generator (v4) — Free
Generate random UUID v4 identifiers in bulk. 100% in your browser — free, no sign-up.
- ✓Free
- ✓No sign-up
- ✓Runs in your browser — files never uploaded
- ✓No watermark
How to
- 1Choose how many UUIDs you need.
- 2Click Generate — they are created in your browser.
- 3Copy one or copy the whole list.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value, written as 36 characters like 550e8400-e29b-41d4-a716-446655440000, used as an identifier that is unique without a central authority. Version 4 UUIDs are generated from random data, so two systems can create IDs independently without ever colliding in practice.
How generation works here
UUIDs are created from cryptographically secure randomness in your browser — they are never sent over the network. You can generate one or many at once and copy the whole list.
When to use UUIDs
Assign IDs to database rows, files, events, or API resources without coordinating a counter; create idempotency keys for requests; or seed test data. They are ideal whenever multiple clients or services need to mint IDs independently.
Why v4 random UUIDs?
Version 4 UUIDs are random, so they need no MAC address, timestamp, or central server and reveal nothing about where or when they were made. The chance of two colliding is so small it is safe to treat them as unique for virtually any application.
FAQ
Are the UUIDs generated privately?+
Yes. They are created from secure randomness in your browser and never sent over the network.
Can I generate many at once?+
Yes. Generate one or a large batch and copy the whole list.
Are version 4 UUIDs truly unique?+
They are random 128-bit values; the chance of a collision is so small they are safe to treat as unique for virtually any application.
What are UUIDs used for?+
Identifying database rows, files, events, and API resources without a central counter, and as idempotency keys for requests.
Is it free?+
Yes, completely free — no sign-up and no watermark.