Generate strong, random passwords online free. Choose length, include uppercase, lowercase, numbers, symbols. Copy instantly. No server. Runs in your browser.
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Password Generator
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Frequently Asked Questions
This generator uses the browser's cryptographically secure random number generator (window.crypto.getRandomValues) rather than Math.random(), which is not cryptographically secure. Cryptographically secure random numbers are generated by the operating system's entropy pool and are suitable for generating passwords, tokens, and cryptographic keys. The passwords generated here are not stored, transmitted, or logged anywhere.
Password entropy is a measure of how unpredictable a password is, expressed in bits. Higher entropy means stronger resistance to brute-force attacks. Entropy = log2(character_pool_size^length) = length x log2(pool_size). A 16-character password using all character types (uppercase + lowercase + numbers + symbols = 95 characters) has entropy of approximately 16 x log2(95) = 16 x 6.57 = 105 bits, which would take longer than the age of the universe to crack by brute force at current computing speeds.
Security experts recommend a minimum of 12 characters for most accounts, 16+ characters for email, banking, and primary accounts, and 20+ characters for master passwords and administrator accounts. Length is more important than complexity — a 20-character lowercase-only password is harder to brute force than an 8-character mixed-character password. This tool defaults to 16 characters, which is strong for general use.
Yes. Even with a generator, using unique strong passwords for every service requires a password manager. A password manager stores all passwords encrypted with one master password, so you only need to remember one strong passphrase. Generated passwords from this tool are best copied directly into your password manager's generator or stored there. Popular options include Bitwarden (open source, free), 1Password, and Dashlane.
Ambiguous characters such as 0 and O, 1 and l and I are visually similar and can cause confusion when reading or transcribing passwords manually. If you need to type or write a password without looking at a screen, excluding ambiguous characters prevents costly typos. For passwords stored directly in a password manager and never typed manually, including ambiguous characters increases the character pool and therefore the entropy.
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Free Password Generator Online — Create Strong Random Passwords Instantly
Weak and reused passwords are responsible for the majority of data breaches and account compromises. The Password Generator on OneDocPDF creates cryptographically strong random passwords using the browser's window.crypto.getRandomValues API, which is the same entropy source used by cryptographic libraries and operating systems for key generation. Unlike many online password generators that use JavaScript's insecure Math.random(), this tool produces passwords that are genuinely unpredictable and suitable for protecting any account or system. No generated password is ever transmitted over the internet or stored on any server.
The NIST Special Publication 800-63B guidelines, which are the authoritative US federal standards for digital identity and password management, recommend using a password manager with randomly generated passwords of at least 15 characters rather than trying to remember complex shorter passwords. The guidelines also recommend against forcing periodic password changes unless there is evidence of compromise, as frequent forced changes lead to weaker passwords. Using this generator to create a unique, random 16-20 character password for each service and storing it in a reputable password manager is the most practical implementation of NIST recommendations.
For other security and utility tools, see our Base Converter for encoding transformations, our Word Counter for text analysis, and our QR Code Generator for creating scannable codes. All tools on OneDocPDF are completely free, private, and run entirely in your browser.