Free Strong Password Generator
Runs 100% in your browser — your passwords never leave your device.
Generate a random password
About this password generator
Weak and reused passwords remain the most common way accounts get compromised. A strong password needs to be long and random — two things humans are bad at producing. This free password generator creates cryptographically random passwords of any length from 4 to 64 characters, mixing uppercase, lowercase, digits and symbols, with an option to exclude ambiguous characters (l, 1, I, 0, O) that are easy to misread.
Randomness quality is what separates a real password generator from a toy. This tool uses only your browser's WebCrypto API (crypto.getRandomValues) — the same source of randomness behind TLS encryption keys. If WebCrypto is unavailable, the generator shows an error and refuses to run rather than silently falling back to the weaker Math.random(). Every password is guaranteed to contain at least one character from each character set you enable, and an entropy readout (in bits) plus a plain-English strength label tells you exactly how strong the result is: 16 characters from all four sets gives roughly 103 bits of entropy — strong for almost every purpose.
Because generation happens entirely on your device, passwords are never transmitted, stored or logged. For real security, store each generated password in a reputable password manager and never reuse passwords across sites.
Worked example
Click Generate with the defaults — 16 characters, all four character sets ticked — and you get something like k7#Qm2$vL9@nX4!pR (yours will differ; every click is a fresh random draw). The readout shows 103.4 bits of entropy and the label Very strong: with 88 possible characters per position (26 uppercase + 26 lowercase + 10 digits + 26 symbols), each character carries about 6.46 bits, and 16 × 6.46 = 103.4. Compare a digits-only 12-character PIN: 12 × 3.32 = 39.9 bits, labeled Weak — fine for a phone lockout with attempt limits, hopeless for an online account. Bump the slider to 20 characters with all sets and you get 129.2 bits. Every password is also guaranteed to contain at least one character from each character set you enabled, so a "symbols" password never accidentally comes out symbol-free.
Who uses a password generator
Anyone creating a new account anywhere uses one — email, banking, social media, work logins — because unique random passwords per site are the single most effective defense against credential-stuffing attacks. IT administrators generate initial passwords and Wi-Fi keys for teams (ticking "exclude ambiguous" when the password must be read aloud or typed from a printout). Developers seed test accounts and staging environments with random credentials. Freelancers and agencies hand clients secure logins for the sites they build. Privacy-conscious users replace memorable-but-guessable passwords across dozens of accounts, storing each in a password manager. The honest framing: the generator makes the password strong, but a password manager plus unique-per-site passwords is what makes you secure.
How to use
- Choose a length with the slider (16 is a strong default; 20+ for master passwords).
- Tick the character sets you want; optionally exclude ambiguous characters.
- Click Generate (or Regenerate for a new one).
- Check the entropy and strength readout, then Copy the password into your password manager.
Limitations
- Some websites restrict password length or ban certain symbols — adjust the options to match the site's rules.
- The generator cannot check whether a password has appeared in a data breach; avoid reusing passwords regardless.
- Strength labels estimate resistance to brute force; they do not protect against phishing or malware on your device.
- Requires a browser with WebCrypto support (all modern browsers); the tool refuses to generate without it.
Frequently asked questions
How random are the generated passwords?
Passwords are generated with your browser's WebCrypto API (crypto.getRandomValues), the same cryptographic randomness used for TLS keys. The generator refuses to run if WebCrypto is unavailable — it never falls back to weaker Math.random().
What password length should I choose?
16 characters from the full character set gives about 103 bits of entropy, which is strong for almost every purpose. Use 20+ for master passwords and anything protecting sensitive accounts. The slider goes up to 64.
What does "exclude ambiguous characters" do?
It removes characters that are easy to confuse when reading: lowercase l, digit 1, uppercase I, digit 0 and uppercase O. Useful when you must read or type a password manually.
What do the strength labels mean?
They map directly to entropy in bits: Weak (under 40), Fair (40–60), Good (60–80), Strong (80–100) and Very strong (100+). A 16-character password from all four character sets scores 103.4 bits — Very strong. The labels estimate brute-force resistance only; they say nothing about phishing or malware.
Is a 12-digit PIN strong?
Not by this tool's measure: 12 digits carry only 39.9 bits of entropy, labeled Weak. That's acceptable for a phone lock screen with attempt limits and lockout delays, but far too weak for an online account that attackers can hammer from anywhere.
Why does every password include each selected character set?
The generator guarantees at least one character from every set you tick. Without that guarantee, a 16-character draw from the full pool could theoretically come out with no symbols at all — the guarantee removes that edge case so the password always matches the policy you chose.
Does excluding ambiguous characters weaken my password?
Barely. It shrinks the pool from 88 to 83 characters, so a 16-character password drops from 103.4 to 102 bits — still Very strong. The readability gain (no more confusing l with 1 or O with 0) is worth far more than the 1.4 lost bits when you must type or read a password manually.
Are my passwords sent anywhere?
No. Generation happens 100% in your browser. Passwords are never transmitted, stored or logged — they exist only on your device until you copy them.
Learn more
Want the reasoning behind the settings above? Read our guide on how to create a strong password — what length and randomness really do, worked weak-vs-strong examples with honest crack-time estimates, and why a password manager matters more than any single password.