How this password generator stays random
The tool calls crypto.getRandomValues(), the browser Web Crypto API’s cryptographically strong random source. It uses rejection sampling rather than a simple remainder operation, avoiding modulo bias when mapping random integers to characters. Complete candidates are accepted only when every selected class appears, so the class requirement does not make some valid passwords more likely than others.
Use a unique password for every account
Password reuse turns one breach into a risk for many accounts. Attackers commonly try exposed email-and-password combinations elsewhere. Give every account a different random password so one service’s breach cannot directly unlock another.
A reputable password manager can generate, save, and autofill long unique passwords so you do not need to memorize them. Protect the manager with a strong master password and multi-factor authentication, keep recovery information safe, and review its security guidance.
What this tool cannot protect against
A random password reduces guessing and reuse risks, but it is not a guarantee of security. It cannot stop phishing, malware, keyloggers, a compromised browser or clipboard, insecure account recovery, shoulder surfing, or a service breach. Generate passwords only on a device you trust, verify the site before pasting, and enable phishing-resistant multi-factor authentication where available.
The entropy figure is an upper-bound estimate based on password length and alphabet size. Requiring every selected class changes the exact entropy slightly, and a website may normalize, truncate, reject, or mishandle some characters. Follow the site’s stated limits.
Frequently asked questions
Does Filekub see the generated password?
No. The browser creates it locally, and this page does not transmit, log, or persist it. Clipboard behavior is controlled by your browser and operating system after you choose Copy.
Why include every selected character class?
Some websites require a lowercase letter, uppercase letter, number, or symbol. The generator keeps drawing uniformly random candidates until all selected classes appear.
Is a longer password always accepted?
No. Some services impose length or character restrictions. Use the longest random password the service accepts, without silently removing characters after generation.
Need to share files too?
Filekub offers browser-based file storage and sharing. Passwords generated here are never attached to your files or account.