Password generator
Generate strong, secure random passwords instantly. Cryptographically secure. Never stored.
A brief history of the password
The computer password was introduced in 1961 by Fernando Corbató at MIT, whose Compatible Time-Sharing System needed a way to keep each researcher's files private on a shared machine. Passwords have been under attack ever since — the first documented password theft happened on that same system a year later. For decades, security advice focused on complexity rules and forced expiry, but modern guidance, including NIST's current recommendations, has shifted to what actually resists attacks: length, true randomness and uniqueness per account. That is exactly what a random password generator provides, paired with a password manager to remember the results.
Cryptographically secure generation
TextlyPop uses the Web Crypto API's crypto.getRandomValues() function to generate passwords. This is cryptographically secure randomness — the same standard used in encryption software and security applications. It is significantly more unpredictable than standard Math.random() which most online password generators use. Your passwords are generated entirely in your browser, never transmitted to any server, and never stored anywhere.
Understanding password entropy
Entropy measures how unpredictable a password is, expressed in bits. A password with 80 bits of entropy would require an attacker to try on average 2^79 combinations to crack — approximately 600 quadrillion guesses. TextlyPop calculates entropy based on your character set size multiplied by the length. Enabling more character types increases the character set, which increases entropy even at the same password length. A 16-character password using all four character types has approximately 105 bits of entropy.
When to exclude ambiguous characters
The ambiguous characters option removes characters that look similar in certain fonts — the number zero and the letter O, the number one and the letters l and I. This is useful when you need to type the password manually rather than copying and pasting, for example when entering a Wi-Fi password on a TV or game console. For passwords you will always paste, there is no reason to exclude them — keeping them in increases your character set and improves entropy.
Frequently asked questions
How do I generate a strong random password?
Set the length to at least 16 characters, enable all four character types — uppercase letters, lowercase letters, numbers and symbols — and click Generate. That combination gives roughly 105 bits of entropy, far beyond what brute-force attacks can crack, and the strength meter will read Very strong. Avoid trimming symbols unless a website rejects them: every character type you remove shrinks the pool an attacker has to search. Store the result in a password manager rather than reusing it anywhere else.
Is an online password generator safe to use?
This one is, because nothing is transmitted. Passwords are generated on your own device with the Web Crypto API's crypto.getRandomValues() — the same cryptographically secure randomness used by encryption software — and never sent to a server, logged or stored. Be more cautious with generators that run server-side, since the password exists on someone else's machine before you ever see it. You can verify this tool works offline: load the page, disconnect from the internet, and it still generates.
What makes a password strong or weak?
Strength comes from length, randomness and uniqueness. A strong password is at least 12–16 characters, mixes uppercase, lowercase, numbers and symbols, and contains no dictionary words, names, dates or keyboard patterns like qwerty123. Uniqueness matters just as much: a perfect password reused on ten sites falls to a single data breach. Attackers crack weak passwords with dictionary lists and known-breach databases first, so a random string beats any memorable phrase pattern of the same length.
Can I generate multiple passwords at once?
Yes. Set the Count field to generate up to 20 passwords in one click with the same length and character settings. Each one is generated independently with cryptographically secure randomness, so there is no relationship between them. Batch generation is handy when provisioning accounts for a team, setting up devices, or picking the one result that avoids characters you find hard to type.
What do the password strength indicators mean?
The meter reflects entropy — the number of bits of unpredictability in your settings. Weak is under 40 bits, Fair is 40–60, Strong is 60–80 and Very strong is over 80. Each additional bit doubles the number of combinations an attacker must try, so the difference between 40 and 80 bits is not double the security but a trillion times more. Length raises entropy fastest: adding four characters helps more than adding one extra character type.
How often should I change my passwords?
Modern security guidance, including NIST's, no longer recommends changing passwords on a schedule — forced rotation pushes people toward weaker, predictable variations. Instead, change a password immediately when there is a reason: the service reports a breach, the password appears in a leak-checking service, you shared it with someone, or you typed it on a device you do not trust. A long random password that has never been exposed can safely stay in place for years.