Strong Random Password Generator — Free & Secure
Create cryptographically random passwords that are genuinely hard to crack.
🔒 Runs in your browser — files never uploaded ⚡ No signup 💯 Free
Strength: — · — bits of entropy · — to crack offline
A strong password is long and random. Everything else — the substituted numbers, the exclamation mark on the end, the birth year — is the kind of pattern attackers' software expects and tries first.
This generator draws every character from your browser's cryptographic random number generator, the same source used for encryption keys. The result is shown only on your screen, never transmitted, never logged.
How to use Password Generator
- Set the length. Sixteen characters or more is the practical floor today. The slider goes to 64 for keys and service credentials.
- Choose character types. Keeping all four enabled gives the largest possible pool per character.
- Check the strength readout below the box — it shows entropy in bits and a realistic offline cracking estimate.
- Copy it and store it in a password manager. Do not try to memorise it.
What entropy actually means
Entropy measures how many guesses an attacker needs, expressed in bits. Each extra bit doubles that number. A 12-character password using all four character sets carries roughly 79 bits; a 20-character one carries about 131 bits.
The practical thresholds: below 50 bits is crackable by a determined individual, 80 bits or more resists an attacker with serious hardware, and 100+ bits is beyond any realistic offline attack for the foreseeable future.
Length beats complexity
Adding one character to a password multiplies the search space by the size of your character set — roughly 94×. Adding a symbol to a short password barely moves the needle by comparison. If you have to choose between "shorter but with symbols" and "longer", choose longer every time.
Use a password manager
A generator only helps if you never reuse the result. The single highest-impact security change most people can make is a password manager with a unique random password per site, so one breached service cannot unlock the others. Turn on two-factor authentication wherever it is offered.
Frequently asked questions
Are these passwords safe to use? Do you store them?
We store nothing. Passwords are generated locally by your browser using crypto.getRandomValues() and exist only on your screen and in your clipboard. No network request is made when you generate one — you can watch your browser's network tab to verify.
How long should my password be?
At least 16 characters for accounts that matter, and 20+ for your email and password-manager master password, since those unlock everything else. Where a site caps length, use the maximum it allows.
What does "bits of entropy" mean?
It is the log-base-2 of the number of possible passwords your settings could produce. 60 bits means roughly a quintillion possibilities. Every additional bit doubles an attacker's work. Aim for 80 bits or more.
Why exclude look-alike characters?
Because 1/l/I and 0/O/o are easy to confuse when a password has to be read aloud, copied from a screen, or typed from a printout. It slightly shrinks the character pool, so add a character or two to compensate.
Is a random password better than a passphrase?
Both work if they are long enough. A four-word random passphrase carries about 52 bits — decent but not great; six words gets you to roughly 78. A 20-character random password reaches about 131 bits and is far shorter to store. Passphrases win only when you must type the password by hand regularly.