Free Password Generator — Secure, Random & Strong (2026)

Generate cryptographically secure passwords, memorable passphrases, and PINs. Real-time strength checker shows entropy in bits and estimated crack time. Fully customizable, nothing is uploaded, works offline.

Password Length16

4128

Character Sets

Uppercase LettersA B C … Z

Lowercase Lettersa b c … z

Numbers0 1 2 … 9

Symbols!@#$%^&*()_+-=[]{}|;:,.<>?

Customise symbol set

Options

Exclude Ambiguous CharsRemoves 0, O, l, 1, I

No Duplicate CharactersEach char used at most once

Number of Passwords

Password Strength

🔴 Very Weak0.0 bits

Crack time (10B guesses/sec): instantly

Charset: 88 chars × length 16 = 103.4 bits entropy

What This Password Generator Can Do

🔐

Cryptographically Secure

Uses crypto.getRandomValues() — the same API used by password managers. Not Math.random(). Truly unpredictable.

💬

Passphrase Generator

Generate memorable multi-word passphrases (correct-horse-battery-staple style) with configurable separators and capitalization.

🔍

Strength Checker

Paste any password to see its entropy in bits, estimated crack time, and a detailed checklist of weaknesses.

🔢

PIN Generator

Generate cryptographically secure 4–12 digit PINs for banks, phone lock screens, and apps. Optional no-repeat mode.

⚙️

Full Customization

Control length (4–128), character sets, custom symbol set, ambiguous char exclusion, no-duplicate mode, and batch generation.

🔒

100% Private

Generated entirely in your browser. No password is ever sent to our servers. Works offline. No account needed.

Related Tools

Why Password Security Matters

In 2023 alone, over 8 billion records were exposed in data breaches. When a site is hacked, attackers get a database of hashed passwords. With modern GPUs running tools like hashcat, they can test billions of password guesses per second. The average person reuses passwords across 8–10 sites — one breach exposes all of them.

Credential stuffing — taking breached email/password pairs and automatically trying them on other sites — is now fully automated. Within minutes of a breach, bots are testing your password on Gmail, your bank, Amazon, and every other major site. A unique, random password for every account is the only complete defense.

8 billion+

Records exposed in 2023 data breaches

80%

Of breaches involve weak or reused passwords

11 seconds

To crack a common 8-character password

How Secure Random Generation Works

Most simple password generators online use JavaScript's Math.random() — a pseudorandom number generator (PRNG) that produces numbers from a deterministic algorithm. Its output can be predicted if the seed is known, and the seed is often just the current timestamp. This makes it unsuitable for security-sensitive applications.

This tool uses crypto.getRandomValues() — the Web Cryptography API's cryptographically secure random number generator. It draws entropy from the operating system (hardware events, interrupt timing, thermal noise) and is the same source used by professional password managers. The output is statistically indistinguishable from true randomness and cannot be predicted even with full knowledge of previous outputs.

Method	Predictable?	Safe for Passwords?	Used By
Math.random()	Yes (given seed)	No	Simple generators, games
crypto.getRandomValues()	No	Yes	This tool, 1Password, Bitwarden

Password Length vs Complexity — The Math

Entropy is calculated as length × log₂(charset size). The table below shows what combinations of length and character set mean for real-world crack time at 10 billion guesses per second — a reasonable estimate for an offline attack on an MD5-hashed password.

Length	Lowercase only (26)	Letters + Numbers (62)	All Types (94)
8 chars	3 minutes	7 hours	4 days
10 chars	35 hours	5 weeks	1 year
12 chars	3 years	190 years	3,000 years
16 chars	2,000 years	460M years	7 billion yrs
20 chars	forever	forever	forever

"Forever" means more time than the age of the universe. For bcrypt or Argon2 hashed passwords, all times above are multiplied by 100,000× or more.

Password vs Passphrase

A passphrase trades character complexity for word length. "correct-horse-battery-staple" is four random words — easy to type and remember, hard to crack because the attacker doesn't know which words were chosen. With a 7,776-word wordlist, each word adds log₂(7776) ≈ 12.9 bits. Four words give 51.7 bits — comparable to a 10-character fully random password.

Passphrases are ideal as master passwords for password managers — you need to type them from memory under pressure, so ease of recall matters. For everything else that gets autofilled or copied, use a long random password. Six random words from the EFF wordlist gives 77.5 bits of entropy — genuinely strong and still memorable after a few repetitions.

Common Password Mistakes to Avoid

✗

Using your name, pet's name, or birthday

The first thing attackers try in a targeted attack is personal information from your social profiles.

✗

Appending ! or 1 at the end

Crackers know this trick. 'Password1!' is barely stronger than 'password' in a dictionary attack.

✗

Using the same password on multiple sites

One breach exposes every account. With credential stuffing, bots test your combo everywhere within minutes.

✗

Substituting letters with numbers (p@ssw0rd)

l33t speak substitutions are in every cracker's dictionary. They add almost no real entropy.

✗

Short passwords (under 12 characters)

An 8-character password with all types can be cracked in under 4 days by a GPU cluster.

✗

Memorable patterns (123456, qwerty, abcabc)

Sequential and keyboard patterns are the first things cracking tools test. Millions of people use them.

Frequently Asked Questions

How does this password generator create random passwords?▾

This tool uses the Web Cryptography API's crypto.getRandomValues() function, which generates cryptographically secure random numbers using the operating system's entropy source (hardware noise, timing variations, and other unpredictable events). This is fundamentally different from Math.random(), which uses a deterministic algorithm that could theoretically be predicted if the seed is known. Cryptographically secure randomness is the gold standard for password generation and is the same approach used by professional password managers like 1Password and Bitwarden.

What is password entropy and why does it matter?▾

Password entropy measures the unpredictability of a password in bits. It is calculated as: entropy = length × log2(charset size). For example, a 16-character password using all character types (94 printable ASCII characters) has 16 × log2(94) ≈ 104.4 bits of entropy. Higher entropy means an attacker must try more combinations to guess it by brute force. At 10 billion guesses per second (a modern GPU cluster), 60 bits takes about 37 years, 80 bits takes over a billion years, and 128 bits is effectively uncrackable with all computing power on earth combined.

How long should my password be in 2026?▾

NIST (US National Institute of Standards and Technology) updated their password guidelines in 2024 to recommend at least 15 characters for general accounts and 20+ for high-value accounts like email and banking. The minimum 8-character requirement from older guidelines is now considered dangerously weak — an 8-character password with all character types has only about 52 bits of entropy and can be cracked in hours with modern hardware. For most accounts, 16 characters is a safe choice in 2026. If you use a password manager, generate 20–32 character passwords since you never have to type them.

What is the difference between a password and a passphrase?▾

A password is a short, complex string like 'Tr0ub4dor&3'. A passphrase is a sequence of random words like 'correct-horse-battery-staple' (popularized by the xkcd comic). A 4-word passphrase from a 300-word list has about 32 bits of entropy — weak by itself, but a 4-word passphrase from a 7,776-word list (EFF dice wordlist) has 51.7 bits. A 6-word EFF passphrase has 77.5 bits — stronger than most people's passwords, and far easier to memorize. Passphrases are particularly useful as master passwords for password managers, since you need to type them from memory.

Should I use a symbol in every password?▾

Not necessarily. Adding symbols increases the charset size from 62 (letters + numbers) to about 94 characters — a gain of about 0.6 bits per character. For a 16-character password, this is about 9.6 extra bits of entropy, which is meaningful but modest. A better approach is to increase password length, which adds the full log2(charset) bits per extra character. A 20-character letters-and-numbers password (119 bits) is stronger than a 12-character all-types password (78 bits). However, use symbols if the site requires them — just don't sacrifice length to add one symbol at the end.

What does crack time mean and how is it calculated?▾

Crack time estimates how long it would take an attacker to guess your password by brute force, assuming the worst case: they have your password's hash and an offline cracking rig. The standard assumption is 10 billion (10^10) guesses per second, which is achievable with modern GPUs running hashcat against MD5 or SHA-1 hashes. The formula is: crack time = (2^entropy / 2) / guesses_per_second — dividing by 2 because on average you find the password halfway through the search space. For bcrypt or Argon2 hashed passwords the actual time is millions of times longer, but this tool uses the conservative MD5 assumption.

Is it safe to use an online password generator?▾

Yes, if the generation happens entirely in your browser — which it does here. This tool uses JavaScript running locally in your browser tab. No password is ever transmitted to any server. You can verify this by disconnecting from the internet and refreshing the page — the tool will still generate passwords because it requires no network connection after the page loads. The source of randomness is your device's operating system via crypto.getRandomValues(), not anything from our servers. For maximum assurance, you can inspect the page source in your browser's DevTools.

What are ambiguous characters and should I exclude them?▾

Ambiguous characters are ones that look similar in certain fonts: 0 (zero) and O (capital o), l (lowercase L), 1 (one), and I (capital i). When you read a password off a screen and type it manually, these pairs are easy to confuse and cause login failures. Excluding them reduces your charset size slightly — from 94 to about 89 characters — which costs about 0.08 bits per character. This trade-off is worth it only if you ever need to type the password manually. If you copy-paste passwords or use a password manager autofill, disable this option and keep the full character set.

What is the strongest type of password?▾

The strongest password is the longest one using the largest character set, generated by a cryptographically secure random source. A 32-character password using all 94 printable ASCII characters has 32 × log2(94) ≈ 208 bits of entropy — far beyond what any current or foreseeable computer can crack. In practice, use at least 20 characters with mixed case, numbers, and symbols for critical accounts. For accounts you must remember (like your email recovery and password manager master password), use a 6-word passphrase, which is easier to memorize and has comparable strength to a 15-character random password.

Should I use a password manager?▾

Yes — a password manager is the single most effective security improvement most people can make. Password managers like Bitwarden (free, open source), 1Password, and Dashlane let you use a unique, random 20+ character password for every website without memorizing anything. The most dangerous password habit is reuse — if one site is breached, attackers immediately try your email and password on every other major site (called credential stuffing). A password manager eliminates reuse entirely. Use a strong, memorable passphrase as your master password and enable two-factor authentication on the manager itself.

How often should I change my passwords?▾

NIST's 2024 guidelines explicitly state you should NOT change passwords on a fixed schedule unless there is evidence of compromise. Forced regular changes cause people to use weaker, predictable patterns (Password1 → Password2 → Password3). You should change a password immediately if: the site announces a breach, you suspect someone has seen it, you shared it with someone who no longer needs access, or you used the same password elsewhere and that other site was breached. Sign up for haveibeenpwned.com to receive breach notifications for your email address.

What is two-factor authentication and does a strong password make it unnecessary?▾

Two-factor authentication (2FA) requires something you know (password) plus something you have (phone with authenticator app, hardware security key) or something you are (fingerprint). A strong password alone does not make 2FA unnecessary — they protect against different threats. A strong password protects against brute force and credential stuffing attacks. 2FA protects against phishing (you type your password into a fake site), keyloggers, and database breaches where the actual password (not just the hash) is stolen. The combination of a strong unique password and 2FA makes account takeover practically impossible for most attackers.

Free Password Generator — Secure, Random & Strong (2026)

What This Password Generator Can Do

Cryptographically Secure

Passphrase Generator

Strength Checker

PIN Generator

Full Customization

100% Private

Related Tools

Why Password Security Matters

How Secure Random Generation Works

Password Length vs Complexity — The Math

Password vs Passphrase

Common Password Mistakes to Avoid

Frequently Asked Questions

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