Question 1

What makes a strong password?

Accepted Answer

A strong password has high entropy: it is hard to guess or crack. Practical factors include length (often 16+ characters for general accounts), variety of characters when using random strings, and randomness (avoid personal information and predictable patterns). More bits of entropy mean a larger search space under idealized assumptions—real risk also depends on how sites store and hash passwords.

Question 2

How long should a password be?

Accepted Answer

A common baseline is at least 16 characters; use more for high-value accounts (email, password manager). Longer secrets increase the search space. Actual resistance depends on the threat model—for example online rate-limited login vs offline cracking of a stolen hash—so focus on length, randomness, and uniqueness per site.

Question 3

Is this password generator safe to use?

Accepted Answer

Passwords and passphrases are assembled in your browser using crypto.getRandomValues, with indices chosen without modulo bias. They are not sent to our servers for generation. If you use the optional Have I Been Pwned check, only the first five hexadecimal characters of the password's SHA-1 hash are sent (k-anonymity); the plaintext password is not transmitted.

Question 4

What is password entropy?

Accepted Answer

Entropy describes unpredictability, often in bits. Under simple models, each extra bit doubles the number of equally likely values. This app estimates entropy from character set size and length (or wordlist size for passphrases). Treat the number as guidance: real attacks depend on many factors beyond the estimate alone.

Question 5

Passphrase vs password — which is more secure?

Accepted Answer

Either can be strong if it is long and random enough. Passphrases built from randomly chosen words (for example from a large list such as the EFF long list) can be memorable and high-entropy. Random character strings pair well with a password manager. Avoid famous quotes, song lyrics, or well-known examples—they appear in attack dictionaries.

Question 6

How often should I change my password?

Accepted Answer

NIST SP 800-63B and similar guidance de-emphasize rotating passwords on a fixed schedule without cause. Change a password when you suspect or know compromise, after a breach affecting that secret, or when a service requires it—not solely because a calendar said so.

Question 7

What are the NIST password guidelines?

Accepted Answer

NIST Special Publication 800-63B (memorized secrets) emphasizes long passwords, checking against breached-password lists, avoiding arbitrary composition rules that hurt usability, not requiring periodic changes without reason, and leaning on MFA. This tool supports long random secrets and optional breach checking; it is not a formal NIST certification.

Question 8

What does 'Have I Been Pwned' check mean?

Accepted Answer

Have I Been Pwned publishes known breached password hashes. We SHA-1 hash your password locally, send only the first five hexadecimal characters of that hash to HIBP's range API, then match the remainder of the hash locally against the returned bucket. Your plaintext password is not sent. We send HIBP's recommended Add-Padding header to reduce observer inference.

Question 9

Should I use a password manager?

Accepted Answer

For most people, yes—a reputable password manager helps you use unique secrets per site. You can generate a random password here and store it in your manager. Examples of widely used managers include 1Password, Bitwarden, and Dashlane; choose one you trust and enable MFA on the vault.

Question 10

What characters make a password strongest?

Accepted Answer

A larger alphabet (uppercase, lowercase, digits, symbols) increases entropy per character when characters are chosen uniformly. Length usually dominates: a long random password from a smaller alphabet can beat a short one from a larger alphabet. Use the longest secret the service allows, generated randomly.

Strongpasswordsfrom yourbrowser —Nothinguploadedever

Character sets

Breach check

Session history

Real-time metrics

Web Crypto API

NIST SP 800-63B-style

HIBP k-anonymity

Security technical brief

Security dispatch

How to Create a Strong Password in 2025: Complete Guide

Password Entropy Explained: Why Bits Matter for Security

Passphrase vs Password: Which Is More Secure?

Web Crypto API

NIST SP 800-63B-style

HIBP k-anonymity

Security technical brief

Security dispatch

How to Create a Strong Password in 2025: Complete Guide

Password Entropy Explained: Why Bits Matter for Security

Passphrase vs Password: Which Is More Secure?

Strongpasswordsfrom yourbrowser —Nothinguploadedever

Password generator

Character sets

Breach check

Session history

Real-time metrics

Cryptographic and privacy specifications

Web Crypto API

NIST SP 800-63B-style

HIBP k-anonymity

Security technical brief

What makes a strong password?

How long should a password be?

Is this password generator safe to use?

What is password entropy?

Passphrase vs password — which is more secure?

How often should I change my password?

What are the NIST password guidelines?

What does 'Have I Been Pwned' check mean?

Should I use a password manager?

What characters make a password strongest?

Security dispatch

How to Create a Strong Password in 2025: Complete Guide

Password Entropy Explained: Why Bits Matter for Security

Passphrase vs Password: Which Is More Secure?

Cryptographic and privacy specifications

Web Crypto API

NIST SP 800-63B-style

HIBP k-anonymity

Security technical brief

What makes a strong password?

How long should a password be?

Is this password generator safe to use?

What is password entropy?

Passphrase vs password — which is more secure?

How often should I change my password?

What are the NIST password guidelines?

What does 'Have I Been Pwned' check mean?

Should I use a password manager?

What characters make a password strongest?

Security dispatch

How to Create a Strong Password in 2025: Complete Guide

Password Entropy Explained: Why Bits Matter for Security

Passphrase vs Password: Which Is More Secure?