Security
Processed locally in your browser — not uploaded
UUID Generator
Generate cryptographically random version 4 UUIDs (RFC 4122) — one at a time or up to 100 at once, with optional uppercase and hyphen-free formatting. Uses the browser's secure random number generator. Runs entirely in your browser.
5 UUIDs
- 56838e9f-c272-4f7d-828a-5457ef002d0b
- 596046c3-c6f0-414c-8cf6-9f2cea3b3626
- 6105ae56-4bab-42ff-852e-6a4c14649088
- 458d60b2-5b47-4305-9b72-b3c31ed3f171
- 1684b971-6365-4638-b8d4-3590825e3029
01
How to use
- Choose how many UUIDs to generate, and whether to uppercase them or drop the hyphens.
- Click Generate, or the list refreshes automatically as you change options.
- Copy a single UUID or all of them at once.
02
Understanding the output
These are version 4 UUIDs (RFC 4122) — 122 random bits plus fixed version/variant bits, generated using the browser's cryptographically secure random number generator (crypto.getRandomValues), not Math.random().
03
Common issues & tips
- •UUIDs aren't sequential or sortable by generation time — that's expected for v4. If you need time-ordered IDs, look at UUID v7 or a ULID instead.
Frequently asked questions
- How random are these?
- They use crypto.getRandomValues() (or crypto.randomUUID() directly, where available) — a cryptographically secure random source, not Math.random().
- Are UUIDs guaranteed to be unique?
- Not mathematically guaranteed, but a v4 UUID has 122 random bits, making a collision astronomically unlikely in practice — far beyond any realistic usage volume.
- Is anything sent to a server?
- No. Generation happens entirely in your browser.