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
- e053af06-b6cd-4cb0-9403-902a8cd8f745
- 49b24452-3aaa-4659-b90a-4ca03091d4db
- 0a8328e1-cca3-4ef6-a0cc-92800b2ecd23
- d80d6dce-b3cc-482a-956c-5097e84d0e43
- 8a303cca-9cc6-490f-a12d-b7e43553df2d
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.