Most account compromises aren't caused by attackers guessing passwords character by character. They happen because passwords are reused across sites (so one breach unlocks many accounts), phished (tricked out of you directly), or chosen from predictable patterns like "Summer2024!". A strong password is random, long, and unique to each account.
This guide covers what makes a password strong according to current NIST guidelines, how to use the free Password Generator to create one in seconds, and where passkeys fit into the picture in 2026.
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Generated in your browser — never transmitted or stored
The password generator runs entirely client-side. No password you generate is ever sent to a server, logged, or seen by anyone. Once you close the tab, it's gone.
What makes a password strong?
Password strength comes down to two factors: length and entropy (unpredictability). NIST SP 800-63B — the US government's authoritative password guidance — now prioritises length above complexity, and recommends checking passwords against known breach databases rather than forcing periodic rotation.
A random generator sidesteps every human bias that makes passwords weak. Here's how randomly generated passwords compare:
| Password type | Example | Strength |
|---|---|---|
| Common word | sunshine | ❌ Very Weak — cracked instantly from a dictionary |
| Word + number | sunshine42 | ❌ Weak — in most wordlist attacks |
| Predictable pattern | Summer2024! | ⚠️ Weak — follows a known template |
| 12 chars, 4 types (random) | tK7!mZ9@xP2# | ✅ Strong — ~10²³ combinations |
| 16 chars, 4 types (random) | tK7!mZ9@xP2#qL8$ | ✅ Very Strong — ~10³¹ combinations |
A 16-character password using all 94 printable ASCII characters has approximately 10³¹ possible combinations — far beyond the reach of any foreseeable brute-force attack, even with dedicated cracking hardware.
3 password myths that get people hacked
🔄 Myth: "Changing passwords regularly keeps you safe"
✅ NIST SP 800-63B specifically removed the recommendation to rotate passwords on a schedule. Forced rotation leads to weak, predictable patterns like "Password1 → Password2". Only change a password if there's evidence of a breach.
🎭 Myth: "P@ssw0rd is strong because it has symbols"
✅ Character substitutions like @ for a and 0 for o are among the first patterns attackers try. A 12-character predictable-with-substitutions password is far weaker than a 12-character random one. Randomness matters more than substitution tricks.
📋 Myth: "Complexity rules make passwords more secure"
✅ NIST now discourages mandatory complexity rules (must have uppercase, symbol, etc.) for user-created passwords — they produce predictable results like "Password1!". This critique doesn't apply to a random generator, which achieves genuine entropy. Always use a generator instead of inventing your own.
How to generate a strong password free online
Open the Password Generator
Go to the free Password Generator — no sign-up, no account needed. A 16-character password with all four character types is generated automatically when the page loads.
Set the length
Use the slider to pick a length from 8 to 64 characters. 16 characters is a strong baseline for most accounts. For email, banking, or a password manager master password, use 24 or more.
Choose your character types
Toggle the four character sets: uppercase (A–Z), lowercase (a–z), numbers (0–9), and symbols (!@#$%^&* and more). All four are on by default. Enable at least three — all four gives you the largest possible character pool and the strongest password.
Use the exclusion options if needed
Exclude Similar Characters removes characters that look alike in many fonts (i, l, 1, L, o, 0, O) — useful only if you'll need to type the password by hand rather than pasting it. If you're using a password manager, leave this off to maximise entropy.
Generate and save to a password manager
Click Generate Password to create a new random password. Click the copy button or the password field to copy it, then paste it directly into your password manager (Bitwarden, 1Password, KeePass, etc.) before closing the tab. The password is gone once you leave the page.
Generate your strong password now
Free, instant, no sign-up. Generated in your browser — never stored or transmitted.
Generate strong password free →Understanding the strength indicator
The strength label updates in real time as you change the length and character options:
Short or uses only one character type — crackable in seconds with a dictionary attack.
Slightly longer or two character types — crackable with moderate compute in hours or days.
Reasonable length with several character types. Adequate for low-stakes accounts with 2FA enabled.
12+ characters with 3–4 character types. Suitable for most accounts.
16+ characters with all four character types. Recommended for any important account.
Character type reference
| Option | Characters included | Default |
|---|---|---|
| Uppercase | A B C D … Z | On |
| Lowercase | a b c d … z | On |
| Numbers | 0 1 2 3 4 5 6 7 8 9 | On |
| Symbols | ! @ # $ % ^ & * ( ) _ + - = [ ] { } | ; : , . < > ? | On |
| Exclude Similar | Removes: i l 1 L o 0 O | Off |
| Exclude Ambiguous | Removes: { } [ ] ( ) / \ ' " ` ~ , ; : . < > | Off |
Password security best practices
Use a unique password for every account. Reusing passwords means a single breach exposes all of them — credential stuffing attacks rely on this.
Store generated passwords in a password manager (Bitwarden, 1Password, KeePass) — never in a plain text file, browser note, or sticky note.
Enable multi-factor authentication (MFA/2FA) on every important account. A strong password can still be phished — MFA stops the attacker even if they have your password.
Check if your credentials have appeared in a known breach at haveibeenpwned.com — a NIST-recommended practice. If your email appears, change any reused passwords immediately.
Do not create passwords based on personal information (birthdays, names, pet names, favourite sports teams) — these are the first things targeted in a targeted attack.
Do not use keyboard patterns (qwerty, 123456, asdfgh) — they appear random but are in every dictionary and are attacked first.
Do not share passwords via email, SMS, or chat. Use a dedicated secure-sharing feature in a password manager instead.
Do not rotate passwords on a fixed schedule "just in case" — NIST SP 800-63B removed this requirement. Only change a password if there is evidence it has been compromised.
Which password manager should I use?
A password manager is the only practical way to use a unique, random password for every account. Here are the most widely trusted options:
Bitwarden
Free & open-source
The most recommended free option. Fully open-source (audited), syncs across all devices, has browser extensions and mobile apps. Self-hosting available.
1Password
Paid (family & team plans)
Popular choice for teams and families. Excellent UX, Travel Mode for border crossings, and Watchtower for breach alerts. $3/month for individuals.
KeePass / KeePassXC
Free & local-only
Fully offline — passwords stored in an encrypted file on your device. No cloud sync (you manage your own backups). Best for users who want zero cloud exposure.
All three use end-to-end encryption. Your master password never leaves your device in plaintext. The key rule: make your master password long (24+ characters) and never reuse it anywhere else.
What about passkeys? (2026 update)
🔑 Passkeys are becoming the preferred alternative to passwords
A passkey is a cryptographic credential tied to your device (biometrics or PIN). Unlike a password, it cannot be phished, guessed, or leaked in a server breach — there's nothing to steal on the server side. Apple, Google, Microsoft, and hundreds of major services (GitHub, PayPal, Amazon, WhatsApp) now support passkeys.
Where you can, use passkeys over passwords. Where passkeys aren't supported yet, a long random password + MFA is the current best practice. Password managers like 1Password and Bitwarden now store passkeys alongside passwords.
Passkeys are based on the FIDO2/WebAuthn standard developed by the FIDO Alliance — an industry consortium whose members include Apple, Google, Microsoft, and hundreds of other organisations. They are covered by NIST SP 800-63B as a phishing-resistant authenticator.
Frequently asked questions
Is the generated password stored anywhere?
No. The password is generated entirely in your browser — it is never sent to any server, logged, or stored. Once you close or refresh the tab, the password is gone. Copy it to your password manager before leaving the page.
How long should my password be?
For most accounts, 16 characters with all four character types is a very strong baseline — roughly 10³¹ possible combinations, beyond any realistic brute-force attack. For email accounts, banking, and your password manager master password, use 24 characters or more.
Is this generator cryptographically secure?
The generator uses Math.random(), which is not a cryptographically secure pseudorandom number generator (CSPRNG). For generating account passwords through a web interface this is adequate — an attacker cannot practically exploit the statistical bias at this scale. However, if you need true CSPRNG output (for cryptographic keys, tokens, or secrets in code), use window.crypto.getRandomValues() directly instead.
What does "Exclude Similar Characters" do exactly?
It removes the characters i, l, 1, L, o, 0, and O from the character pool before generating. These look nearly identical in many fonts, which makes the password hard to type accurately. Enable this only when you'll need to type the password by hand. If you're copying it to a password manager, leave this off — excluding characters reduces entropy.
What is a passphrase and is it better than a random password?
A passphrase is a sequence of multiple random words, e.g. "correct-horse-battery-staple". NIST SP 800-63B endorses them as a valid alternative to random character passwords. Entropy-wise: a 4-word Diceware passphrase provides ~52 bits of entropy — roughly equivalent to an 8-character random password. A 6-word passphrase reaches ~78 bits, comparable to a 12-character random password. Use a passphrase for accounts you need to type by hand (like a computer or device login). For everything else, use a random password stored in a password manager.
Should I use all four character types?
Yes, when the website allows it. Using all four types (uppercase, lowercase, numbers, symbols) maximises the character pool — 94 printable ASCII characters vs. 26 for lowercase-only — which exponentially increases the number of possible combinations. Some sites restrict special characters; if you encounter an error, try disabling symbols.
What is the difference between this and a password manager's built-in generator?
Password manager generators work the same way conceptually and are equally secure. Use whichever is more convenient. If you are not yet using a password manager, this tool generates the password — then paste it into your manager as you set it up.
Create a strong password now
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