Password Generator – Strong, Random & Secure, Free
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Password Generator
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Entropy: —
A weak or reused password is one of the most common ways accounts get compromised — not through some sophisticated hack, but simply by being guessed, found in a previous data breach, or reused across too many sites. This generator creates strong, random passwords instantly, using your browser's cryptographically secure random number generator, with nothing ever transmitted or stored anywhere.
What Actually Makes a Password Strong (According to NIST)
Password guidance has changed significantly in recent years. According to the U.S. National Institute of Standards and Technology's SP 800-63B Digital Identity Guidelines, the current official federal guidance prioritizes password length over forced complexity rules, requiring a minimum of 8 characters and recommending systems support at least 64 characters for user-created passwords. This is a deliberate shift away from older rules that forced arbitrary mixes of symbols and periodic changes, which research showed often led people to create weaker, more predictable passwords (like swapping "password" for "Password1!").
Length vs. Complexity: Why Longer Usually Beats Weirder
A long, random password is dramatically harder to crack than a short one stuffed with symbols. This is a matter of simple math: every additional character multiplies the total number of possible combinations, while adding a handful of symbol requirements to a short password barely moves the needle against modern offline cracking speeds. This is why current guidance increasingly favors long random strings or passphrases over short, symbol-heavy passwords that are hard for humans to remember but not actually much harder for a computer to guess.
Understanding the Entropy Meter
This tool measures password strength using entropy — a measurement of randomness expressed in bits, calculated from your password's length and the size of the character set used. Roughly:
| Entropy | General Strength |
|---|---|
| Below 40 bits | Weak — crackable relatively quickly with modern hardware |
| 40 – 60 bits | Reasonable — acceptable for lower-stakes accounts |
| 60 – 80 bits | Strong — solid for most personal and financial accounts |
| Above 80 bits | Very strong — well beyond what's practically crackable today |
Higher entropy means more possible combinations an attacker would need to try, making the password exponentially harder to guess through brute-force methods.
Other Practices That Matter as Much as the Password Itself
- Never reuse passwords across sites — a breach on one low-stakes site can expose the same password used on a much more important account.
- Use a password manager — remembering dozens of unique, long, random passwords isn't realistic for most people; a password manager makes it practical to use strong, unique passwords everywhere.
- Turn on multi-factor authentication (MFA) wherever it's offered — current NIST guidance strongly encourages MFA specifically because it protects an account even if a password is somehow compromised.
- Don't change passwords on a fixed schedule for no reason — current guidance advises against forced periodic password rotation without evidence of compromise, since it tends to encourage weaker, more predictable password patterns over time.
Frequently Asked Questions
How long should a strong password be?
Current NIST guidance sets a minimum of 8 characters but recommends systems support much longer passwords, and length is generally considered more important than complexity for resisting modern cracking methods. Many security professionals now recommend 12–16+ characters for important accounts.
Do I really need symbols and numbers in my password?
Not strictly, according to current guidance — length matters more than forced complexity. That said, adding a mix of character types does increase entropy for a given length, so this generator includes them as optional toggles rather than mandatory requirements.
Is it safe to use an online password generator?
It's safe as long as generation happens entirely in your browser (client-side) rather than being sent to a server, which is how this tool works — using the Web Crypto API's cryptographically secure random number generator, with nothing transmitted anywhere.
Should I change my passwords regularly even if nothing was breached?
Current NIST guidance advises against forced periodic password changes without evidence of compromise, since research shows this often leads to weaker, more predictable password patterns over time. Change a password promptly if you have reason to believe it was exposed, rather than on an arbitrary schedule.
What does "excluding ambiguous characters" do?
It removes visually similar characters like lowercase L, uppercase I, and the number 1, or uppercase O and zero, which can be genuinely difficult to tell apart when a password needs to be read aloud or typed manually from a screen or printout.
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