Password Generator
Generate strong, random passwords in seconds. All processing runs in your browser — no data is ever sent to a server.
Character types
103 bits of entropy
About Password Generator
Weak and reused passwords are the most common cause of account compromises. An eight-character password using only lowercase letters has fewer than 210 billion possible combinations — a number modern GPUs can exhaust in seconds through brute force. A 16-character password mixing uppercase, lowercase, numbers, and symbols has more than 10^30 combinations — effectively uncrackable with any foreseeable computing technology.
Our Password Generator uses your browser's `crypto.getRandomValues()` API to generate cryptographically secure random passwords — the same source of randomness used by professional security tools, operating systems, and password managers. This means the generated passwords are statistically unpredictable and cannot be reproduced without knowing the exact state of the random number generator at the moment of generation.
You can customize every aspect of the generated password: length from 8 to 128 characters, inclusion of uppercase letters, lowercase letters, numbers, and symbols, exclusion of visually ambiguous characters (0/O, 1/l/I) for passwords that need to be typed manually, and bulk generation of up to 20 passwords at once for team onboarding, temporary credential creation, or testing account systems.
How to Use Password Generator
- 1Set the desired password length using the slider (longer is always more secure).
- 2Toggle the character types you want included: uppercase, lowercase, numbers, and symbols.
- 3Enable "Exclude ambiguous characters" if the password will be typed manually — it removes 0, O, l, 1 and I.
- 4Tick "Generate multiple passwords" and set the count (2 to 20) if you need a batch.
- 5The password is generated automatically with cryptographic randomness and refreshes whenever you change an option — click "Regenerate" for a fresh one.
- 6Read the strength meter under the result: it rates the password Weak to Very Strong and shows its exact entropy in bits.
- 7Click "Copy" for the single password, the copy icon beside any batch entry, or "Copy All" to take the whole list at once.
Use Cases
- →Create a strong, unique password for a new account registration
- →Generate secure API keys, tokens, or secret strings for development and testing
- →Bulk-generate temporary passwords for onboarding a team or group of new users
- →Create a high-entropy master password for a password manager vault
- →Generate random secrets for environment variables, JWT signing keys, or encryption keys
- →Create easier-to-type passwords by excluding ambiguous characters when someone has to read them off a screen
- →Compare settings side by side using the entropy readout before deciding on a password policy
Tips
- ✓Use at least 16 characters — each additional character multiplies the search space exponentially
- ✓Watch the bits of entropy, not the colour: under 40 bits reads Weak, under 60 Fair, under 80 Strong, and 80 or more Very Strong
- ✓A 16-character password using every character type lands around 103 bits of entropy; lowercase only, around 75
- ✓Enable all character types to maximize entropy and resistance to dictionary and brute-force attacks
- ✓Use "Exclude ambiguous characters" when creating passwords people will need to read and type manually
- ✓Never reuse the same password across multiple accounts — generate a unique one for each
- ✓Store generated passwords in a password manager like Bitwarden, 1Password, or Dashlane immediately
- ✓Length matters more than complexity — a 20-character lowercase password beats an 8-character mixed one
Frequently Asked Questions
Yes. This tool uses crypto.getRandomValues(), which is a cryptographically secure pseudo-random number generator (CSPRNG) provided by the browser. Unlike Math.random(), crypto.getRandomValues() produces values that cannot be guessed or reproduced.
No. All password generation happens entirely in your browser. No data is transmitted to any server, logged, or stored anywhere except your own browser memory.
Entropy measures how hard a password is to brute-force. A 16-character password using all character types has roughly 100+ bits of entropy — meaning an attacker would need to try 2^100 combinations on average.
For most online accounts, 16 characters is a solid minimum. For high-value targets — email, banking, password manager master password — use 20 or more characters.
Yes, if the site allows it. Each additional character type increases the possible combinations exponentially. A 16-character password using only lowercase letters has about 75 bits of entropy; adding all types pushes it to 100+ bits.
Ambiguous characters are visually similar pairs: 0 (zero) and O (letter O), 1 (one) and l (lowercase L). Excluding them makes passwords easier to type or read without making them significantly weaker.