Password Generator
Generate strong, cryptographically secure random passwords. Customize length and character sets to meet any requirement.
I1MjkFEPfYOHuCWC
* Estimated at 1 billion guesses per second (brute force)
About Secure Password Generation
This generator uses the Web Crypto API (window.crypto.getRandomValues()) to produce cryptographically secure random values — the same standard used in security-critical applications. Password entropy measures the unpredictability in bits: higher is always better. A 16-character password using all character sets yields over 100 bits of entropy, making brute-force attacks effectively impossible. For encoding generated secrets for transmission, see our Base64 Encoder/Decoder.
Password strength depends on two factors: length and character set size. Doubling the character set adds roughly 1 bit of entropy per character; doubling the length doubles the total entropy. For most accounts, aim for at least 60 bits of entropy (Strong). For high-value accounts, use Very Strong (80+ bits). If you need to share encoded data securely online, our URL Encoder/Decoder helps format data for safe web transmission.
Related Calculators
Explore more free online calculators to help with your calculations
Take this calculation further
Browse the other calculators collection for more tools in this subject.
For a related calculation, use IP Subnet Calculator to calculate network address, broadcast, usable hosts, subnet mask, and wildcard from IP and CIDR. Alternatively, use URL Encoder/Decoder to encode or decode URLs using percent-encoding. Shows which characters were encoded.