Prime Number Checker

Free prime number checker with primality test, range finder, and prime factorization — 100% client-side. 100% serverless.

🔒 100% Private

⚡ Completely Free

🌐 Runs in Browser

📦 Export Ready

Check if a number is prime, find primes in a range, or factorize a number into its prime factors.

Features

All calculations run in your browser.

Frequently Asked Questions

Check single primality, find all primes in a range, and prime factorization.

Up to 100,000 numbers in range. Single check works for very large numbers.

Yes. 100% in your browser.