Random Password Generator
Generate strong, secure random passwords with custom length and character sets. Copy with one click.
Generate Multiple
About this calculator
Generate strong random passwords with the length and character sets you choose, avoid look-alike characters, and copy with one click. Create 5, 10 or 20 at once.
Passwords are made in your browser with a cryptographic random source and are never sent anywhere.
How to use it
- Set the length with the slider.
- Tick upper, lower, numbers, symbols and exclude ambiguous.
- Press Generate, then Copy.
Why random beats clever
Password strength is measured in bits of entropy: length × log₂(pool size). A pool of lowercase letters is 26 (4.7 bits per character), mixed case plus digits is 62 (5.95 bits) and with symbols about 94 (6.55 bits). A random 16-character password from 94 symbols has about 105 bits, which is far beyond brute-force reach. Length beats complexity: a 20-letter lowercase password (94 bits) is stronger than an 8-character mix of everything (52 bits). Real attackers use dictionaries and leaked passwords first, so predictable choices like Password1! are weak even though they tick every box.
Worked example
Entropy examples
| 8 lowercase letters | 37.6 bits (minutes to hours offline) |
| 8 mixed characters (94 pool) | 52.4 bits |
| 12 random characters (94 pool) | 78.7 bits |
| 16 random characters (94 pool) | 104.9 bits |
| 4 random common words | about 52 bits |
| 6 random Diceware words | 77.5 bits |
Runs in your browser. Nothing is uploaded.
Tips and common mistakes
- Use a password manager and unique passwords for every site.
- Prefer length: 14+ characters, or a passphrase of 5+ random words.
- Turn on two-factor authentication for important accounts.
- Never reuse your email password anywhere.
- Change a password only when it's exposed or you suspect a breach.
Frequently asked questions
What makes a strong password?
Length, randomness and uniqueness.
How long should a password be?
At least 14 characters for random strings.
Are symbols required?
Not if the password is long and random.
Is a passphrase safe?
Yes, if the words are randomly chosen.
Is it safe to type my password here?
This runs locally, but never test a real password on any website.
Should I rotate passwords regularly?
Only after exposure; current guidance discourages forced rotation.