UUID Generator
Generate cryptographically-random version-4 UUIDs — one or hundreds at a time. Copy or download them in a click.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
How it works
Each UUID is produced with crypto.randomUUID() (or a crypto-random fallback), entirely in your browser.
100% client-side — nothing you paste is ever uploaded.
Frequently asked questions
Are these UUIDs random and safe?
Yes — they are version-4 UUIDs generated with the browser's cryptographic random source (
crypto.randomUUID), giving extremely low collision probability.How many can I generate?
Up to 500 at once. Use the copy or download button to grab them all.
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Sources & references
These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.