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Password Strength
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16
Create strong, random passwords to keep your accounts safe
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Strong passwords are your first line of defense against hackers and unauthorized access. Our generator creates truly random passwords that are virtually impossible to guess.
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A strong password is your primary defense against unauthorized access to your accounts. Understanding what makes a password secure can help you protect your digital identity and sensitive information.
The single most important factor in password strength is length. Every additional character exponentially increases the time required to crack a password through brute-force attacks.
Using a mix of different character types dramatically increases the possible combinations:
A 12-character password using all four types has over 475 sextillion possible combinations.
Human-created passwords tend to follow predictable patterns. We substitute letters with similar-looking numbers (@ for a, 3 for e), add numbers at the end, or capitalize only the first letter. Attackers know these patterns and exploit them.
Pro tip: Use a random password generator like ours to create truly unpredictable passwords that don't follow human patterns.
Each account should have its own unique password. If one account is compromised in a data breach, your other accounts remain safe. Password managers make it practical to use unique passwords everywhere.
Security experts measure password strength in "bits of entropy." Higher entropy means more randomness and security:
Creating a strong password isn't just about what you include—it's also about what you should never use. Here's why common password choices put your security at risk.
Avoid using any of the following in your passwords:
Hackers use a technique called "social engineering" to gather personal information about targets. They scour social media profiles, public records, and data breaches to compile details about potential victims.
Real-world example: In targeted attacks, hackers create custom "dictionaries" containing variations of a victim's personal information. A birthday of March 15, 1990 generates attempts like "0315", "1990", "March15", "031590", and hundreds of variations—all tested within seconds.
These passwords are cracked instantly because they're the first ones attackers try:
If you use any of these, change them immediately to randomly generated passwords.
Both passwords and passphrases can secure your accounts, but they work differently. Understanding when to use each can help you balance security with usability.
| Aspect | Password | Passphrase |
|---|---|---|
| Format | Random mix of charactersKx9#mP2$vL4@ |
Multiple random wordscorrect-horse-battery-staple |
| Typical Length | 12-20 characters | 20-40+ characters |
| Memorability | Difficult to remember | Easier to remember |
| Typing Speed | Slower (special characters) | Faster (regular words) |
| Security Level | Very high (with sufficient length) | Very high (with 4+ random words) |
| Best Use Case | With password managers | Master passwords, memorized logins |
Random character passwords are ideal when:
Passphrases work better when:
Security note: A 4-word passphrase using random dictionary words (like "correct-horse-battery-staple") has about 44 bits of entropy. To match the security of a 16-character random password (~100 bits), you'd need 7-8 random words. Both approaches are valid—choose based on your needs.
The traditional advice of changing passwords every 30-90 days is now considered outdated. Current security best practices from NIST (National Institute of Standards and Technology) recommend changing passwords only when:
Frequent mandatory changes often lead to weaker passwords as users make minor, predictable modifications. Focus instead on using strong, unique passwords for each account.
Reputable online password generators are safe when they meet these criteria:
Our generator meets all these requirements. Your passwords are generated entirely in your browser using the cryptographically secure crypto.getRandomValues() function and are never transmitted or stored anywhere.
For most purposes, 16 characters is the sweet spot, offering excellent security while remaining practical. Here's a breakdown:
Yes, absolutely. Password managers are one of the most effective security tools available. Benefits include:
Popular trusted options include Bitwarden (free/open source), 1Password, Dashlane, and the built-in managers in iOS and Chrome. The only password you need to memorize is your master password—make it a strong passphrase.
Yes. Even the strongest password can be compromised through phishing, data breaches, or keyloggers. Two-factor authentication adds a second layer that requires something you have (phone, security key) in addition to something you know (password).
Enable 2FA on all important accounts, especially:
Hardware security keys (like YubiKey) offer the strongest 2FA protection, followed by authenticator apps. SMS-based 2FA is better than nothing but can be vulnerable to SIM-swapping attacks.
Adding symbols increases the "character space" available for each position in your password. Here's the math:
For a 12-character password, the difference is enormous: lowercase-only has about 95 trillion combinations, while full character set has over 475 sextillion combinations—billions of times harder to crack.
Theoretically, yes—but practically, no. A well-constructed password can take longer to crack than the age of the universe.
With current technology, a 16-character random password using all character types would take approximately:
Attackers don't usually try to brute-force strong passwords. Instead, they target weak passwords, use stolen credentials from data breaches, or employ phishing attacks. Your goal is to make your password hard enough that attackers move on to easier targets.
Use the free service Have I Been Pwned (haveibeenpwned.com) to check if your email or passwords have appeared in known data breaches. You can:
Many password managers also include breach monitoring as a built-in feature, automatically alerting you when credentials need to be changed.
Actually, this advice is nuanced. Writing down passwords is acceptable in some situations:
However, you should never:
The best solution is a reputable password manager with a strong master passphrase you can memorize.
Both protect passwords, but they work differently:
Hashing is a one-way function. Your password is transformed into a fixed-length string (hash) that cannot be reversed. Websites store the hash, not your actual password. When you log in, they hash your input and compare it to the stored hash.
Encryption is a two-way function. Data is scrambled using a key and can be unscrambled with the same key (symmetric) or a paired key (asymmetric). Password managers use encryption to store your passwords so you can retrieve them.
Good websites use hashing (specifically bcrypt, scrypt, or Argon2) to store passwords. If a site can email you your password, they're storing it insecurely—consider that a red flag.
We take your security seriously. Unlike many online tools, our password generator is designed with privacy as a core principle, not an afterthought.
Our Promise: Every password is generated entirely in your browser using JavaScript. No passwords are ever transmitted to our servers, stored in databases, or logged in any way. We literally cannot see your passwords.
Our generator uses crypto.getRandomValues(), a cryptographically secure pseudo-random number generator (CSPRNG) built into modern browsers. This is the same level of randomness used by security professionals and meets standards for generating encryption keys.
You can verify our privacy claims by: