Strong Password Generator
Generate genuinely random passwords with configurable length and character classes, produced by a cryptographically secure random number generator. For creating credentials that survive modern GPU cracking rigs.
How to use
- Set the password length, 16 or more is a sensible floor.
- Choose character classes: lowercase, uppercase, digits, symbols.
- Optionally exclude ambiguous characters like 0/O and 1/l.
- Generate, copy, and store it in a password manager immediately.
Password strength is arithmetic: entropy equals length times log2 of the alphabet size. A 12-character password over the full 94-symbol printable set carries about 78 bits. Each added character contributes roughly 6.5 more. Against an offline attack on a fast hash, modern GPU clusters try billions of guesses per second, which is why 8-character passwords of any composition are effectively dead and 16+ is today's reasonable floor for anything important.
The generator matters as much as the length. This tool uses a CSPRNG, the operating system's cryptographic randomness, the same source as Python's secrets module, rather than a seeded PRNG like random(), whose output is reproducible if the seed leaks. It also avoids the classic modulo-bias bug, where naive mapping of random bytes onto an alphabet makes some characters statistically likelier than others.
Human rules make passwords worse, not better. Composition requirements (one uppercase, one symbol) push people toward predictable patterns like Password@123, which cracking dictionaries try first. NIST's current guidance (SP 800-63B) drops mandatory composition rules and periodic rotation in favour of length, breach-list screening and password managers. Practical advice follows directly: generate a long random password per site, let a manager remember it, and never reuse one across services, reuse is what turns one site's breach into your email being taken over. Velona generates passwords server-side, returns them once, and logs nothing.
Examples
Input: length=16, upper+lower+digits+symbols
Output: K7#mQpx@2Wvn9!LfInput: length=24, upper+lower+digits
Output: XqT82mNfR4wKcJp7ZvBh3dLyInput: length=6, digits only
Output: 804152Frequently asked questions
How long should my password be in 2026?
16 characters of full-alphabet randomness (~104 bits) is beyond any feasible brute force. For accounts protecting money or email, go 20+. Length beats complexity: a 20-character lowercase password is stronger than 10 characters of mixed everything.
Are these passwords stored anywhere?
No. Each password is generated from the OS's cryptographic RNG, returned in the response, and discarded. Anonymous usage is not logged. Signed-in run history records that the tool ran, never the generated value.
Is a passphrase like 'correct horse battery staple' better?
Four to five random dictionary words (roughly 50-64 bits) are excellent where you must type or memorise the password. For anything a password manager fills automatically, a 16+ character random string gives more entropy in fewer characters.
Should I change my passwords every 90 days?
Not any more, NIST guidance dropped forced rotation because it drives predictable increments (Summer2025 to Autumn2025). Change a password when there's evidence of compromise, and enable two-factor authentication instead.
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