What is Password Generator?
Password Generator is a browser-based tool that creates strong, random passwords with full control over length and which character types are included — lowercase, uppercase, numbers, and symbols — plus an option to exclude ambiguous characters. It generates one password or many at once and shows an entropy estimate so you can judge each password's strength.
Weak, reused, and guessable passwords are the leading cause of account compromise. A strong password is long and drawn randomly from a large character set, making it infeasible to guess or brute-force. Humans are notoriously bad at inventing randomness — we fall back on words, dates, and patterns — which is exactly why a generator that uses real randomness produces far stronger passwords than anything typed by hand.
Every password here is generated with your browser's cryptographically secure random number generator, the same class of randomness used for encryption keys. Crucially, nothing is transmitted — not even to generate the password. You can confirm zero network requests in your browser, so the passwords you create never leave your device.
Why use Password Generator?
The single most effective thing you can do for account security is use a long, unique, random password for every service. This tool makes that effortless: pick a length, choose the character types, and get a genuinely random password instantly. Paired with a password manager, it removes any temptation to reuse or simplify passwords.
The live entropy estimate turns an abstract idea — "how strong is this?" — into a concrete number. Entropy, measured in bits, quantifies how many guesses an attacker would need. Watching the estimate rise as you increase length or add character types teaches you which choices actually matter, and helps you meet or exceed a target strength.
Generating locally is essential for a secret. A password produced on a remote server is a password that has, however briefly, existed outside your control. This tool never does that — generation happens entirely in your browser with secure randomness, so the value is yours alone from the moment it is created.
Features
- Generate strong random passwords of any length
- Toggle lowercase, uppercase, numbers, and symbols
- Option to exclude ambiguous characters (0, O, 1, l, I)
- Generate one password or many at once
- Live entropy estimate and strength rating
- Uses the browser's cryptographically secure random generator
- Per-password one-click copy
- Runs entirely in your browser — nothing is uploaded or logged
How to use Password Generator
- Set the desired password length — longer is stronger, and a length of 16 or more is a good baseline.
- Choose which character types to include: lowercase, uppercase, numbers, and symbols.
- Optionally enable "exclude ambiguous characters" if the password will be read or typed by hand.
- Set how many passwords you want, then click Generate.
- Check the entropy and strength indicator, then copy the password you want to your clipboard.
Example 1 — A strong 16-character password
With all character types enabled at length 16, you get a high-entropy password suitable for important accounts.
Input
Length: 16, all character typesOutput
k9$Rf2@pXvQ7mZ!t (example — yours will differ)Example 2 — Excluding ambiguous characters
Enable the exclude-ambiguous option to avoid characters that are easy to misread when typing a password manually.
Input
Length: 20, exclude ambiguous (no 0/O/1/l/I)Output
wR7kMv3pXqAeYt8nHjBc (example — yours will differ)Common Mistakes
- Choosing a short length: strength grows dramatically with length. A short password, even with symbols, is far weaker than a longer one. Favor length over complexity — aim for 16 characters or more.
- Disabling too many character types: turning off symbols or numbers shrinks the character pool and lowers entropy. Keep as many types enabled as the target system allows.
- Reusing a generated password across sites: the whole benefit of a generator is a unique password per account. Reusing one means a breach on one site compromises the others.
- Not saving the password before navigating away: these passwords are not stored anywhere, by design. If you generate one and leave without copying it into a password manager, it is gone.
- Excluding ambiguous characters unnecessarily: that option slightly reduces entropy, so only enable it when a human will actually read or type the password; for manager-stored passwords, leave it off.
- Assuming an entropy number guarantees safety: high entropy resists brute force, but it does not protect against phishing, keyloggers, or a reused password leaking elsewhere. A strong password is necessary, not sufficient.
Developer Tips
- Store every generated password directly in a password manager rather than trying to remember it — the generator plus a manager is the modern best practice for unique, strong credentials everywhere.
- Prefer increasing length over adding exotic symbols; each extra character adds more strength than most complexity tweaks, and length is rarely rejected by password rules.
- Enable "exclude ambiguous characters" only for passwords a person must transcribe (like a Wi-Fi key printed on a card), and leave it off for machine-stored secrets to keep maximum entropy.
- Use the bulk generation feature to create several candidate passwords at once, then pick one — handy when a site has quirky character requirements.
- Remember the entropy figure reflects the character set and length only; a password is only as safe as how you store and transmit it afterward.
Frequently Asked Questions
- What makes a password strong?
- Strength comes from unpredictability, which is driven mainly by length and the size of the character set. A long password drawn randomly from lowercase, uppercase, numbers, and symbols has enormous entropy, meaning an attacker would need an infeasible number of guesses to crack it. Length matters most: adding characters increases strength exponentially. Randomness is equally critical — a long but predictable password (a word plus a year) is weak, which is why a generator using true random selection beats anything a human invents.
- What does the entropy number mean?
- Entropy, measured in bits, quantifies how unpredictable a password is — roughly, how many guesses an attacker would need on average to find it. Each additional bit doubles the guessing effort, so a password with 80 bits of entropy is vastly harder to brute-force than one with 40. The tool calculates entropy from your chosen length and character set, so you can watch it climb as you lengthen the password or enable more character types, and aim for a comfortably high value for important accounts.
- Is the password generated on a server?
- No. Every password is generated locally in your browser using the Web Crypto API's cryptographically secure random number generator — the same quality of randomness used for encryption keys. Nothing is transmitted, logged, or stored, not even during generation. You can verify this by opening your browser's Network tab while generating: there are zero outbound requests, and the tool works offline. This means the password exists only on your device from the moment it is created.
- Should I exclude ambiguous characters?
- Only when a human will read or type the password by hand. Characters like 0 and O, or 1, l, and I, are easy to confuse in print or on screen, so excluding them prevents transcription errors for things like a Wi-Fi password on a printed card. However, removing characters slightly shrinks the pool and lowers entropy. For passwords stored in a password manager and never typed manually, leave the option off to keep the maximum possible strength.
- How long should my password be?
- Longer is better, and length is the most impactful setting. A minimum of 16 characters is a solid baseline for important accounts, and going to 20 or more provides a comfortable margin against future advances in cracking hardware. Because you are storing these in a password manager rather than memorizing them, there is little downside to generating long passwords. Only shorten if a specific system imposes a maximum length that forces you to.
- Are these passwords safe to use for real accounts?
- Yes. Because they are generated with cryptographically secure randomness entirely in your browser and never transmitted, they are suitable for protecting real accounts. To get the full benefit, use a unique generated password for every service and store each one in a password manager. Keep in mind that even the strongest password can be undermined by phishing, malware, or reuse, so combine strong passwords with two-factor authentication and good general security hygiene.