Find the greatest common factor and least common multiple of two numbers.

Is GCF & LCM free to use?

Yes — GCF & LCM is free to use, with no sign-up, no install and no account.

Does GCF & LCM upload or store my data?

No — GCF & LCM runs entirely in your browser, so your text, files and results never leave your device.

No — it works in any modern browser (Chrome, Edge, Firefox, Safari) with no downloads, accounts or plugins.

What is GCF & LCM?: Find the greatest common factor and least common multiple of two numbers.
Is GCF & LCM free to use?: Yes — GCF & LCM is free to use, with no sign-up, no install and no account.
Does GCF & LCM upload or store my data?: No — GCF & LCM runs entirely in your browser, so your text, files and results never leave your device.
Do I need to install anything to use GCF & LCM?: No — it works in any modern browser (Chrome, Edge, Firefox, Safari) with no downloads, accounts or plugins.