Password Generator | Strong, Random & Secure Passwords

Entropy Bits	Approx. Crack Time	Rating	Recommended Action
< 40 bits	Seconds to minutes	Very Weak	Replace immediately
40 – 60 bits	Hours to days	Weak	Increase length or add character types
60 – 80 bits	Years to decades	Fair	Acceptable for low-risk accounts
80 – 100 bits	Centuries	Strong	Good for most accounts
100+ bits	Practically infinite	Very Strong ✓	Ideal — store in a password manager

Frequently Asked Questions

Is this password generator truly random and secure?

Yes. Every password is built using crypto.getRandomValues() — the browser's cryptographically secure pseudorandom number generator (CSPRNG), seeded from hardware entropy sources such as CPU timing jitter, mouse movement and system interrupts. This is fundamentally different from Math.random(), which produces deterministic sequences that are not suitable for security-sensitive tasks. You can verify there is zero server contact by opening your browser's Developer Tools, switching to the Network tab, and clicking Generate — you will see no outgoing requests after the initial page load.

Every password produced here carries the same quality of randomness as passwords generated by professional security software like KeePass or Bitwarden. Once generated, use our Password Strength Checker to run a full crack-time analysis and confirm the output meets your target security level before storing it.

How long should my password be?

For standard online accounts, 16 characters combining uppercase, lowercase, digits and symbols produces around 105 bits of entropy — far beyond what any attacker can crack in a practical timeframe. For high-value accounts such as email, banking and your password manager's master passphrase, aim for 20 or more characters. NIST's latest Digital Identity Guidelines make length the primary security driver: a randomly chosen 20-character lowercase password is mathematically stronger than a 12-character password that mixes every character type.

Watch the entropy pill next to the slider update in real time as you adjust length, and use the Entropy Reference Guide on this page to translate bit counts into real-world crack times. Once you have a candidate, the Password Strength Checker gives a detailed breakdown including pattern detection and incremental improvement suggestions.

What is password entropy and why does it matter?

Entropy, measured in bits, quantifies how unpredictable a password is. Each extra bit doubles the number of guesses an attacker must make to crack it by brute force. A password with 60 bits of entropy has over one quintillion possible values; adding 10 more bits multiplies that by a thousand. The formula is: entropy = length × log₂(charset size). A 12-character password from all 94 printable ASCII characters carries roughly 78 bits; extend it to 16 characters and you reach 104 bits — a practical difference of around a million times harder to crack.

The Entropy Reference Guide above translates those numbers into real-world crack times assuming a GPU attacker running 10 billion guesses per second against a fast hash. If you are building applications that store user credentials, the hashing algorithm matters just as much as the password's entropy — see our Bcrypt Hash Generator for correctly salted slow-hash generation, and our Hash Generator for general-purpose cryptographic hashing.

Random passwords vs passphrases — which should I choose?

Random character passwords maximise entropy per character. A 20-character string from the full 94-character ASCII set delivers around 131 bits — uncrackable within any realistic timeframe. The trade-off is memorability: most people cannot recall a string like Xk#9mLpQ!2vRjN@s without looking it up. Passphrases trade density for recall — a five-word combination such as Coral-Drift-Maple-Scout-Blaze provides around 64 bits of entropy, strong enough for most use cases and far easier to type from memory.

Use Random mode for every credential you will store in a password manager, and switch to Passphrase mode for the one or two passwords you genuinely need to memorise: your manager's master password, a device login, or a work VPN. If you are verifying the strength of an existing passphrase before committing to it, paste it into our Password Strength Checker for a full analysis. For credentials stored server-side, our Bcrypt Hash Generator handles secure storage hashing.

What does "Avoid Ambiguous Characters" do, and should I enable it?

Certain characters look nearly identical in many common fonts: the digit zero (0) and uppercase letter O, the digit one (1), lowercase L and uppercase I. When reading or typing a password manually — entering a Wi-Fi pre-shared key on a smart TV, reading a credential from a printed sheet, or dictating it over the phone — these cause frequent transcription errors. Enabling this option removes those characters from the generation pool before sampling begins.

The entropy reduction is negligible — typically less than 2 bits for a 16-character password — while the practical benefit when typing credentials manually is significant. If you only ever copy-paste passwords from a manager and never type them manually, you can leave this option off and benefit from the marginally larger character pool. When in doubt, leave it enabled: the security difference is immeasurable, but the usability improvement in manual-entry scenarios is real.

What does "No Repeating Characters" do, and when should I use it?

When this option is active, every character in the generated password appears at most once — the generator samples without replacement from the character pool, similar to drawing cards from a shuffled deck. This can be useful for credentials that must be typed manually (where repeated characters are easy to miscount), and for compliance with site policies that prohibit consecutive identical characters. The statistical effect on entropy is minimal at lengths below 20 characters with a full character set enabled.

There is one important constraint: a no-repeat password cannot be longer than the total number of unique characters in the pool. With all four standard sets enabled you have around 88 distinct characters after removing ambiguous ones, so no-repeat mode works correctly for any practical password length. If you reduce the character set significantly and set a very long length, the generator silently caps the output at the pool size. The entropy display updates to reflect the actual output length in all cases.

Can I use custom or non-ASCII characters in my password?

Yes. The "Add Custom Characters" field accepts any Unicode character you paste in — currency symbols such as €, £ and ¥, accented letters, or any other glyph your keyboard can produce. These are appended to the active character sets before generation, so they are selected with the same cryptographic randomness as everything else. Adding a set of, say, 10 currency symbols increases the pool size by 10, adding roughly 0.3 bits of entropy per character — a modest but real improvement.

The important caveat is compatibility: some websites, operating system login screens and legacy applications do not accept non-ASCII input in password fields, or silently truncate or mangle unusual characters during transmission or storage. Always test that a non-ASCII character is accepted and survives a login cycle before committing to such a password, and verify your password manager stores and retrieves the full Unicode string correctly. If compatibility is uncertain, stick to the standard printable ASCII set — letters, digits and symbols — which is universally supported across all platforms and systems.

How do I generate passwords for multiple accounts at once?

Switch to the Bulk Generate tab, set your preferred length and character sets, choose a quantity up to 100, and click Generate. Every password is produced by an independent call to crypto.getRandomValues(), so no two passwords in the batch share a pattern or generation seed. The full list appears in the dark output panel and can be copied to the clipboard as a line-delimited block or downloaded as a plain-text file named passwords.txt.

This mode is particularly useful for IT administrators provisioning initial user credentials before first login, developers seeding test environments with realistic credential data, or anyone setting up pre-shared keys for multiple network segments simultaneously. For generating unique session identifiers, API tokens or database primary keys alongside passwords, our UUID / GUID Generator and Secure Token Generator operate on the same client-side, server-free principle.

What password habits do attackers exploit most often?

Modern credential-stuffing and brute-force attacks exploit a predictable set of weaknesses: dictionary words and names (cracking tools test billions of variations per second using known word lists); keyboard walks such as qwerty or asdfgh; predictable substitutions like p@ssw0rd (among the very first patterns tested by automated tools); personal information including birthdates, pet names and postcodes (harvested from social media before an attack begins); short passwords under 12 characters (vulnerable to GPU-accelerated brute force); and password reuse across multiple accounts (one breach at a low-security forum can unlock email, banking and cloud storage that share the credential).

The only defence that addresses all of these simultaneously is a password manager holding a unique randomly generated password for every account. Run any password you are uncertain about through our Password Strength Checker to see exactly which weaknesses it has and get specific improvement recommendations. Check whether existing passwords have appeared in known breach databases at haveibeenpwned.com and rotate any that appear there immediately.

How should I store generated passwords safely?

Use a dedicated password manager — Bitwarden (open-source, free tier), 1Password (commercial) and KeePass (local, open-source) are well-regarded options across different budgets and threat models. These encrypt your entire vault behind a single master passphrase using AES-256; you only need to remember one thing. Never save passwords in a plain-text file, an unprotected spreadsheet, a browser's autocomplete without a master password, a messaging thread, or a sticky note. All of those storage methods are recoverable by anyone with brief physical or digital access to your device.

For developers building applications that handle user passwords, always hash rather than encrypt or store plaintext. Use a purpose-built slow-hashing function like bcrypt with an appropriate cost factor, never MD5 or SHA-1 alone. Our Bcrypt Hash Generator produces correctly salted hashes at configurable cost factors ready for production use. Our Hash Generator covers general-purpose cryptographic hashing for file integrity verification, content addressing and data comparison tasks where speed rather than slowness is the goal.

Should I use a different password for every account?

Absolutely — this is one of the highest-impact security decisions you can make. In a credential-stuffing attack, an adversary takes breached username-password pairs and automatically tests them against hundreds of other services within minutes of the original breach becoming public. If you reuse a password, a single compromise at a low-security forum or retailer can expose your primary email, bank account and cloud storage simultaneously. With a password manager, maintaining a unique 20-character random password for every account adds zero meaningful overhead to your daily workflow.

Use our Random Number Generator if you also need cryptographically random integers for PIN generation or sampling, and our PIN Generator for numeric-only credentials like phone lock screens and bank card PINs. For unique identifiers that are not passwords — database keys, session tokens, API credentials — our UUID / GUID Generator and Secure Token Generator produce correctly formatted cryptographically random identifiers in the formats your application expects.

What is the difference between a password and a username — do I need to randomise both?

A username identifies you to a service; a password authenticates you. Most services use an email address as the username, which is not secret, so randomising it adds little security benefit there. However, on services that allow a chosen username rather than an email address, using a unique, non-personally-identifiable username provides a meaningful privacy benefit: it prevents correlation of your accounts across services, reduces the surface area for social engineering attacks that start with knowing your username, and limits the impact of a targeted credential attack that requires knowing your exact username.

Our Username Generator creates memorable, unique usernames by combining word styles and suffixes — useful for forums, social platforms and any service where email-as-username is optional. Pair a generated username with a generated password from this tool for maximum account isolation. If the service also requires a PIN for secondary verification (banking apps, mobile payments), our PIN Generator creates cryptographically random numeric codes at any digit length.

How do I encode or hash a generated password for use in a configuration file or API?

Raw passwords should never appear in configuration files, environment variable files committed to version control, or API request logs. If you need to include a credential in a configuration context, the correct approach depends on the use case. For HTTP Basic Authentication headers, the credential pair is Base64-encoded — our Base64 Encoder / Decoder handles this instantly in your browser. For API tokens and session secrets where you need a specific format, our Secure Token Generator outputs cryptographically random values in hex, Base64 and URL-safe Base64 formats ready for direct use in your application configuration.

For server-side storage of passwords in a database, never store the raw password or a simple hash. Use a slow password hashing algorithm: our Bcrypt Hash Generator produces a salted bcrypt hash at a configurable cost factor that you can use directly in your application's user table. For checksums, content fingerprinting and integrity verification where you need a fast hash of a known-good value, our Hash Generator produces MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes entirely in-browser.

Free Password Generator

What This Password Generator Does

Tips for Getting the Best Results