How to Create a Strong Password — And Why Most People Get This Wrong
"Use a strong password." Every security guide, every account setup, every IT department says it. Very few explain what "strong" actually means mathematically, or why the advice most people follow is dangerously outdated.
This guide explains how password cracking actually works, what the current science says, how to create passwords that would take billions of years to crack, and how to generate them for free in your browser — without sending anything to any server.
How Password Cracking Actually Works
Most people imagine hackers manually trying passwords one by one. Reality is very different.
Dictionary attacks. Automated tools try every word in every language, plus common substitutions: password, p@ssword, P@55w0rd. Common names, cities, sports teams, and keyboard patterns are all in the dictionary. Modern cracking software runs at 10–100 billion guesses per second on consumer hardware with a GPU.
Credential stuffing. When a website is breached (it happens constantly), attackers get a list of real email+password combinations and try them on every other website automatically. If you reuse passwords, one breach exposes all your accounts.
Brute force. Trying every possible combination. At 100 billion guesses per second: all 6-character passwords crack in 0.003 seconds; all 8-character lowercase in 9 seconds; all 8-character mixed-case+numbers+symbols in 23 minutes; but all 12-character full-set passwords take centuries. The math is unambiguous: length is the single most important factor in password security.
What Makes a Password Strong in 2026
The old advice (outdated): "Use at least 8 characters. Include uppercase, lowercase, a number, and a symbol." This produces passwords like Password1! — technically meeting all requirements, in every cracker's dictionary, cracked in milliseconds.
The current understanding (NIST SP 800-63B, updated 2024): Length matters most — a 16-character random lowercase string is more secure than a complex 8-character string. True randomness beats human-chosen complexity, because humans choose memorable patterns that attackers know to try. Complexity rules matter less than length and randomness. Never reuse passwords. And password managers are the recommended solution.
Password strength is measured in bits of entropy — the mathematical uncertainty for an attacker:
| Password | Entropy | Time to crack (100B/sec) |
|---|---|---|
password | 0 (in dictionary) | Instant |
P@ssw0rd1 | ~10 bits effective | Instant |
| 4-word passphrase | 44 bits | ~3 months |
| 12 random alphanumeric | 71 bits | ~750 years |
| 16 random (full set) | 105 bits | ~1 billion years |
| 20 random (full set) | 131 bits | Longer than the universe |
A 16-character random password cannot be cracked with any known technology — not today, not in your lifetime. A memorable password you invented yourself is far weaker than you think.
How to Generate a Truly Strong Password for Free
Our free password generator uses crypto.getRandomValues() — the browser's cryptographically secure random number generator, the same source used by banking security systems and operating system encryption.
Critically, generation happens entirely in your browser. No password is sent to any server. You can verify this: disconnect from the internet and the generator still works perfectly.
How to use it:
- Open our Password Generator
- Set length (we recommend minimum 16 characters)
- Choose character types: uppercase (A–Z), lowercase (a–z), numbers (0–9), symbols (!@#$%^&*)
- Optional: exclude ambiguous characters (0, O, l, 1, I) for passwords you'll type manually
- Click "Generate" or press Enter
- Copy the password immediately
Generate as many as you need — each result is independently random, with no daily limit.
The Passphrase Alternative
Random character strings are maximally secure but hard to memorize. For passwords you need to type from memory (your computer login, your password manager master password), a passphrase is better — 4–6 random words chosen from a large list.
The standard is the Diceware method: roll 5 dice, look up the result in the EFF Large Wordlist, and that's your first word; repeat for each word (5–6 recommended). A 6-word Diceware passphrase has approximately 77 bits of entropy — comparable to a 12-character random password, but potentially memorable. The key is true randomness: human-chosen word combinations follow patterns (subject + verb + noun) that attackers exploit.
The Password Manager Solution
The most important security decision you can make today: use a password manager and have a unique, randomly generated password for every account. Most people have 50–200 online accounts — remembering 200 unique random passwords is impossible. The solution: remember one strong master password; the manager remembers everything else.
Reputable free options include Bitwarden (open source, end-to-end encrypted, the most recommended free option in 2026) and KeePassXC (open source, stores your database locally for maximum privacy). Paid options like 1Password, Dashlane, and NordPass run $3–5/month. Your master password should be a 6-word Diceware passphrase — strong enough to be secure, memorable enough to recall. Never store it digitally; write it on paper in a secure physical location.
Specific Passwords That Deserve Extra Attention
Your email account is the master key to every other account — password resets go there. Use your longest, most random password here and enable two-factor authentication. Your password manager master password should be a memorized Diceware passphrase, never stored digitally. Banking and financial accounts need unique random passwords with all available authentication enabled. For work accounts, follow your organization's policy. And for accounts you haven't updated in years (especially pre-2015), change their passwords — many old breaches are still being exploited.
Two-Factor Authentication — The Other Half
A strong password protects you from cracking. Two-factor authentication (2FA) protects you from phishing and credential theft — even with your correct password, an attacker can't log in without the second factor. From most to least secure: hardware security key (YubiKey, Google Titan — phishing-proof), TOTP authenticator app (Google Authenticator, Authy), push notification (Duo, Okta Verify), and SMS text (better than nothing but susceptible to SIM swap attacks). Enable 2FA on every account that supports it, starting with email, banking, and password manager.
Signs Your Password Has Already Been Leaked
Check whether your email has appeared in known breaches at Have I Been Pwned (haveibeenpwned.com) — it hashes your query before sending, so your full email is never transmitted. Your browser (Chrome, Safari, Firefox, Edge) also checks saved passwords against breach databases automatically. If you find your email in a breach, change the password on that site and on every other site where you used the same password.
Common Password Myths Debunked
"I use a system — I'll remember all my passwords." Any system producing memorable passwords produces predictable ones, likely in attacker dictionaries.
"No one cares about hacking my accounts." Credential attacks are automated and indiscriminate — everything is targeted simultaneously.
"Changing passwords regularly makes me safer." NIST now says forced regular changes reduce security by pushing users toward predictable patterns (Summer2026! → Fall2026!). Change passwords when there's a breach, not on a schedule.
"Long passwords are hard to remember." You don't need to — your password manager remembers them.
Frequently Asked Questions
What is the most secure type of password?
A randomly generated string of 16+ characters with mixed character types, generated by a cryptographically secure random number generator (not a human). Our password generator uses crypto.getRandomValues().
How long should a password be? At minimum 12 characters for accounts you care about, 16+ for important accounts (email, banking, password manager), and 20+ if the site allows it and you're using a password manager.
Is it safe to use an online password generator? Only if it runs in your browser without sending passwords to any server. Our generator runs locally — disconnect from the internet and it still works.
How often should I change my password? When you discover it was in a breach, suspect access, or shared it with someone you no longer trust. Not on a fixed schedule.
What if I forget my password? Use a password manager and you'll never need to remember more than one. For other accounts, use the "Forgot Password" recovery flow — which is why protecting email access is so critical.