1. How Our Calculators Work
Every calculation on lcmcalculator.co runs 100% client-side in your web browser using JavaScript BigInt math. We do not have a backend database storing the numbers you type.
2. Local Browser Storage (localStorage)
For your convenience, your browser saves two small items in localStorage on your own device:
lcm-theme: Remembers whether you selected Light, Dark, or System color mode.lcm-recent-calcs: Remembers your last 5 number calculations so you can click back to them.
This information never leaves your browser and is never transmitted to any server. Clearing your browser data erases it immediately.
3. Emails & Contact
If you choose to email us via our Contact page, we use your email address solely to reply to your question or feedback. We never sell, rent, or share email addresses with anyone.