Password Generator
100% LocalCreate secure, high-entropy random passwords.
Entropy Report
Entropy is a measure of randomness. A password with 128 bits of entropy is considered cryptographically secure against brute-force attacks by modern supercomputers. Your current configuration provides a pool of 1.00e+0 possible combinations.
Privacy note
This tool runs entirely in your browser. Your input is never uploaded, logged, or sent to AllDevToolsHub or anyone else, and it keeps working offline once the page has loaded.
How to Use Password Generator
Set Length
Drag the slider or type the desired password length (8 to 128 characters).
Choose Character Sets
Toggle uppercase, lowercase, digits, and symbols to include.
Generate
Click Generate to produce a cryptographically random password.
Copy
Copy the password to clipboard. Check the entropy meter for strength.
Password Generator: the essentials
AllDevToolsHub's Password Generator is a free, browser-based tool that produces cryptographically strong random passwords using the Web Crypto API CSPRNG, not Math.random(). No installation or account required, generation happens entirely locally with no telemetry. Choose length and character classes, uppercase, lowercase, digits, symbols, and the tool returns a high-entropy string entirely in your browser. Suitable for credentials you genuinely care about: password manager masters, root accounts, encryption keys, and one-off service logins.
Key points
- Generation uses crypto.getRandomValues() backed by the OS entropy pool (/dev/urandom, CryptGenRandom), not Math.random(), which is a deterministic PRNG trivially predictable from a few observed outputs.
- Password entropy is H = L × log2(N): a 16-character password from the full 94 ASCII printable pool gives ~105 bits, beyond the reach of any plausible offline brute-force for decades.
- Length dominates character-class diversity, a fully random 16-char [a-z] password is far stronger than 'Password1!' even though only the latter satisfies typical composition rules.
- On bcrypt-hashed leaks an 8×RTX-4090 rig manages ~200K guesses/sec; on unsalted MD5 the same rig hits ~100 billion/sec, which is why the site's hash choice matters as much as your password length.
When to use it
- Generating a 20+ character master password for a password manager (Bitwarden, 1Password, KeePassXC) where the credential is typed once and then stored, never re-entered.
- Producing a Diceware-style passphrase of 5–6 words for a disk-encryption volume or SSH key passphrase that must be memorized but still needs 64+ bits of entropy.
- Creating one-off service-account credentials, database root passwords, or initial admin secrets that go straight into a vault like HashiCorp Vault, AWS Secrets Manager, or Doppler.
- Generating high-entropy seeds for API keys, signing secrets, or CSRF tokens when an application-side CSPRNG is unavailable and a human needs to paste the value into a config.
Common mistakes
- Using Math.random() or Lodash _.random() to generate passwords or tokens in production code, both are seeded PRNGs and predictable, not cryptographically secure.
- Hand-editing a generated password to make it 'memorable' (capitalizing the first letter, appending '!'), the moment a human shapes the output, the entropy estimate is wrong.
- Reusing the same strong password across multiple sites, a breach at one site (often using fast unsalted SHA-1) unlocks every account that shares the credential.
- Trimming a password to fit a site's silent length cap or character blacklist, many sites truncate to 16 chars or strip symbols server-side, so the stored hash no longer matches what was generated.
Learn More
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Base64 Encoding: When You Should and Shouldn't Use It (2026 Guide)
Bcrypt vs. Argon2 in Practice: Choosing the Right Hashing Algorithm
Don't settle for MD5 or SHA-256 for passwords. Learn why Bcrypt and Argon2 are the industry standards, how they differ, and which one you should use for your next project in 2026.
What is Password Generator?
Frequently Asked Questions
Technical Deep Dive
Password Generator
Generate cryptic passwords that are impossible to guess. Customize length, character sets, and complexity requirements. Includes a strength meter and entropy calculation to ensure your accounts are safe.
1Password’s generator is excellent and ships your rules into their vault. This page uses crypto.getRandomValues and never stores the result.
Generate length 20, mixed case, digits, symbols. You should get ~120 bits of naive entropy. Uncheck symbols if a legacy bank form rejects them.
Closing the tab discards the password. Copy it into a manager before you navigate away.
01 Entropy Reference Matrix
| Length | Alphanumeric (62) | Full ASCII (94) | Attack Resistance |
|---|---|---|---|
| 12 chars | ~71 bits | ~78 bits | Online Safe |
| 16 chars | ~95 bits | ~104 bits | Offline Resistant |
| 20 chars | ~119 bits | ~131 bits | State-Level Safe |
| 24 chars | ~142 bits | ~157 bits | Quantum Resistant |
02 Generation Pipeline
03 Pick the Right Password for the Job
"Use a strong password" undersells the choice, different accounts have different threat models, and the same 20-character string isn't optimal for every slot:
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Banking, primary email, password manager master 20+ characters, full ASCII pool, generated and stored by a password manager (with the master itself being a memorable 6-word Diceware passphrase). Enable hardware-key MFA on top, these are the accounts that unlock everything else.
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Work apps, GitHub, AWS, your cloud provider 16+ characters, autofilled from the manager, MFA mandatory. Rotate when an employee leaves or a vendor breach is disclosed in their ecosystem, not on a fixed schedule.
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News sites, forums, free trials 12–14 characters is fine. These accounts get breached often; assume they will be. The reason length still matters at this tier is that breach databases get cross-checked against your other accounts, anything reused is at risk too.
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Wi-Fi passwords, kiosk logins, dictation Use the no-ambiguous-characters option. Excluding
0/O,1/l/Icosts ~1.6 bits across 16 characters, meaningless next to the time saved when a guest reads the password off a sticky note. -
SSH key passphrase, disk encryption A Diceware passphrase. You will type these on a fresh device with no password manager available, memorable matters, and "5–6 random words" gives both security (~65–77 bits) and typability.
04 Worked Examples
H = L × log2(N)Pa$$w0rd!, 9 chars, full ASCII pool ⇒ raw 59 bits. Effective ~15 bits after dictionary mangling rules: it's in every cracker's first pass.4Mc!9X&rTpZv2qLhB, 16 chars, full ASCII ⇒ ~105 bits. Past offline-brute-force range against bcrypt.correct-horse-battery-staple-velvet, 5 EFF Diceware words ⇒ ~64.6 bits. Comparable to a 10-character random password, but you can memorize it.
The raw character count of a password is a starting point; the dictionary-resistance of the components is what determines real-world strength.
Target password: 12 random characters from full ASCII (~78 bits). Attacker: rented 8× RTX-4090 rig (~$30/hour cloud rate).
MD5 → ~100 B guesses/sec → cracked in ~12 days → $8k
SHA-256 → ~25 B guesses/sec → cracked in ~50 days → $36k
bcrypt → ~200k guesses/sec → 5.7 million years → ∞ (safe)
argon2id → ~50k guesses/sec → 22 million years → ∞ (safe)
Your password's strength is the lower bound; the website's hash choice, which you don't control, is the upper bound. Length compensates: bumping the same password to 16 chars adds ~26 bits, making SHA-256 also effectively safe.
Rule: "min 8 chars, must include UPPER, lower, digit, symbol"
Common result: Password1! ← satisfies the rule, ~15 bits effective entropy
Generated: x9k$mLwq2!Hb5P ← 14 chars random, ~92 bits actualComposition rules predictably push humans toward "first letter capital, digits at the end, common symbol substitution." Cracking dictionaries are tuned for exactly that pattern. A truly random 14-character password from a smaller pool (e.g. lowercase + digits only, 36 symbols ⇒ ~72 bits) is dramatically stronger than Password1!.
05 Related Tools
Generating a password is the start of a workflow, strength analysis, hashing, and adjacent token formats round it out:
Password Strength Tester
Paste any password, yours or one you're auditing, and see entropy, crack-time estimates, and dictionary-match warnings.
bcrypt Hasher
Hash a password with adjustable work factor, or verify a candidate against a stored hash. Same library backends use server-side.
Entropy Calculator
Plug in length and character-pool size to compute raw entropy bits, useful for designing password policies.