Secure Password Generator — Passwords, Passphrases & PINs
Generate cryptographically secure passwords for any account, memorable passphrases for master passwords, or PINs — all using your browser's CSPRNG. Nothing is ever sent to a server or stored anywhere.
Strength: — | Entropy: — bits
Entropy: — bits
How to Use the Password Generator
- On the Password tab, set your desired length with the slider and choose which character sets to include — uppercase, lowercase, numbers, and symbols.
- Check Exclude ambiguous characters if the password will be typed manually from a screen (removes 0/O/l/1/I).
- Click Generate for a new password — the strength meter and entropy display update instantly.
- Switch to Passphrase to generate a sequence of random words with a custom separator, capitalization, and an optional appended digit.
- Use the PIN tab for a numeric code of 4–12 digits generated using the browser CSPRNG.
- Open Bulk to generate 5, 10, or 25 passwords at once — copy individual passwords or all of them in one click.
Key Features
- Cryptographically secure generation: All randomness comes from
window.crypto.getRandomValues()— the OS-backed CSPRNG, notMath.random(). - Entropy display: See exactly how many bits of entropy your password has and a strength label (Weak, Fair, Strong, Very Strong) based on that value.
- Passphrase mode: Generate diceware-style passphrases with configurable word count (3–10), separator, capitalization, and an optional appended number.
- Bulk generation: Generate up to 25 passwords simultaneously, each with an individual copy button and a "Copy All" option.
- Exclude ambiguous characters: Remove visually similar characters (0/O, 1/l/I) to prevent transcription errors.
- 100% client-side: Passwords are generated locally and never transmitted. They are gone the moment you close or refresh the tab.
Use Cases
Generate Strong Passwords for Online Accounts
For accounts stored in a password manager, use the Password tab with length 20+ and all character sets enabled. The entropy display confirms you have well over 100 bits — far beyond any realistic brute-force attack. Enable the exclude-ambiguous option only if you plan to type the password manually.
Create Memorable Passphrases for Master Passwords
A passphrase like "Timber-Anchor-Frost-Lamp" is far easier to memorize than a random character string of equivalent entropy. Use the Passphrase tab for your password manager master password, device unlock PIN, or any credential you must remember and type regularly. A 4-word passphrase offers roughly 51 bits of entropy; 5 words gives approximately 64 bits.
Generate Secure PINs for Devices and Accounts
The PIN tab generates numeric codes of 4–12 digits using the browser CSPRNG, producing genuinely random values rather than memorable patterns (like birth years or repeated digits). Use it for device PINs, temporary access codes, or numeric-only authentication systems.
Bulk Password Generation for Development and Testing
When seeding a test database, creating placeholder user accounts, or generating example passwords for documentation, the Bulk tab produces up to 25 passwords in one click. Copy all of them to the clipboard as a newline-separated list for immediate use in scripts or configuration files.
Teaching Password Security Concepts
The entropy display and strength meter make abstract security concepts tangible. Students can observe how adding a character set increases entropy, how length compounds rapidly, and why a short password with symbols is often weaker than a long password with only lowercase letters — all in real time.
FAQ's
No. All generation happens locally in your browser using window.crypto.getRandomValues(). Passwords are never sent to any server, never logged, and are discarded the moment you close or refresh the tab.
For online accounts stored in a password manager, 16 characters is a solid minimum — a 16-character password with all character types has approximately 100 bits of entropy. For offline encryption (disk encryption, zip archives), aim for 20 or more characters. For master passwords, a 5-word passphrase is both secure and memorable.
Ambiguous characters are letters and digits that look identical in common fonts: 0 and O, 1 and l and I. Excluding them prevents transcription errors when you must read a password from a screen or print and type it manually. If your password will be used only through copy-paste or autofill, there is no need to exclude them.
A passphrase is a sequence of random dictionary words, such as "Timber-Anchor-Frost-Lamp". It is much easier to memorize than a random character string while providing comparable entropy. Use passphrases for credentials you must remember and type daily — such as your password manager master password or laptop login — and use random character passwords for everything else stored in the manager.
Entropy measures how unpredictable a password is, expressed in bits. Each additional bit doubles the number of guesses an attacker needs. For online accounts with rate limiting, 60 bits is generally sufficient. For offline encrypted files or high-value accounts, aim for 80+ bits. A 16-character password using all character sets typically provides around 100 bits.
Yes. window.crypto.getRandomValues() is a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG) backed by the operating system's entropy pool (e.g., /dev/urandom on Linux, CryptGenRandom on Windows). It is the correct API for security applications and is far superior to Math.random(), which is not cryptographically secure.
Yes — the Bulk tab is designed for exactly this use case. Generate up to 25 passwords at once and copy all of them as a newline-separated list for use in seed scripts or configuration files. Remember to hash any passwords before storing them using bcrypt, scrypt, or Argon2 on the server side.
A 4-word passphrase drawn from this tool's 200-word list has approximately 30 bits of entropy — enough for low-security uses but modest. A 5-word passphrase provides around 37 bits. For higher security, increase word count or use a larger word list. A 16-character random password with all character types (~100 bits) provides stronger entropy than any practical passphrase, but is much harder to remember.
Related Tools
Toolaroid's password generator covers every common credential creation scenario: long random passwords for password managers, memorable passphrases for master credentials, numeric PINs for device access, and bulk generation for development seeding. Every password is created using the browser's Cryptographically Secure Pseudo-Random Number Generator and never touches a server. The entropy display and strength meter give you objective feedback rather than vague qualitative labels, helping you make informed decisions about security trade-offs. For the next step after generation — storing passwords securely — explore the bcrypt demo to understand proper password hashing for backend systems.
Guides & Use Cases
Step-by-step guides for specific workflows