{"id":39,"date":"2026-05-04T18:52:21","date_gmt":"2026-05-04T18:52:21","guid":{"rendered":"https:\/\/simpletool.io\/blog\/?p=39"},"modified":"2026-05-04T18:52:48","modified_gmt":"2026-05-04T18:52:48","slug":"strong-random-password-generator","status":"publish","type":"post","link":"https:\/\/simpletool.io\/blog\/strong-random-password-generator\/","title":{"rendered":"Strong Random Password Generator: NIST-Aligned &#038; Secure"},"content":{"rendered":"\r\n<div class=\"ai-summary\" style=\"padding: 14px 18px; background: #f6f9fc; border-left: 4px solid #635BFF; border-radius: 8px; font-size: 15px; margin-bottom: 28px;\"><strong>TL;DR:<\/strong> A strong random password generator uses your browser&#8217;s Web Crypto API (<code>crypto.getRandomValues<\/code>) to produce passwords from genuine OS-level entropy, not predictable <code>Math.random()<\/code>. Aim for at least 80 bits of entropy \u2014 that&#8217;s roughly 16 mixed-case alphanumeric characters or a 6-word passphrase. Our <a href=\"https:\/\/simpletool.io\/tools\/strong-random-password-generator\/\">free generator<\/a> does both and shows you the entropy live, so you can see exactly how strong each output is.<\/div>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The fundamental rule of password security has changed quietly: NIST&#8217;s 2024 update (SP 800-63-4) prohibits forcing users to mix uppercase, lowercase, digits, and symbols. The reason is empirical. Forced complexity rules produced more predictable passwords, not stronger ones \u2014 users picked the same dozen tricks (capitalise the first letter, replace <code>o<\/code> with <code>0<\/code>, add <code>!<\/code> at the end) and attackers learned them years ago. The new guidance: <strong>length is what matters<\/strong>. A 16-character lowercase-only password has more entropy than an 8-character password using the full ASCII set.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Our <a href=\"https:\/\/simpletool.io\/tools\/strong-random-password-generator\/\">strong random password generator<\/a> implements this guidance. It defaults to 20 characters with the full mixed-case alphanumeric+symbol pool, computes the entropy live, and runs entirely in your browser using the Web Crypto API \u2014 your password never travels to any server. This guide explains the math behind password strength, why <code>Math.random()<\/code> is dangerous, the three modes (random, pronounceable, passphrase) and when to use each, and the storage workflow that keeps strong passwords actually usable.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Why password entropy matters more than complexity<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Password strength is measured in <strong>bits of entropy<\/strong>. A password with N bits of entropy means an attacker needs to try up to 2^N combinations to crack it by brute force. The math is simple: each character drawn at random from a pool of P characters contributes log\u2082(P) bits.<\/p>\r\n\r\n\r\n\r\n<table style=\"width: 100%; border-collapse: collapse; margin: 12px 0 20px;\">\r\n<thead>\r\n<tr style=\"background: #0A2540; color: #fff;\">\r\n<th style=\"text-align: left; padding: 10px 14px;\">Character pool<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">Pool size<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">Bits per character<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Lowercase only (a-z)<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">26<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">4.7<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Lower + upper (a-z, A-Z)<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">52<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">5.7<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Lower + upper + digits<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">62<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">5.95<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px;\"><strong>Lower + upper + digits + symbols<\/strong><\/td>\r\n<td style=\"padding: 10px 14px;\"><strong>~94<\/strong><\/td>\r\n<td style=\"padding: 10px 14px;\"><strong>6.55<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Multiply bits-per-character by length to get total entropy. The threshold to remember:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Under 40 bits:<\/strong> weak. Crackable in minutes-to-hours by a modern GPU farm against any common password hash.<\/li>\r\n<li><strong>40-60 bits:<\/strong> moderate. Survives casual attacks but falls to determined attackers within days against fast hashes (MD5, SHA-256).<\/li>\r\n<li><strong>60-80 bits:<\/strong> strong. Beyond practical brute force for any single attacker; survives most state-of-the-art GPU farms for years.<\/li>\r\n<li><strong>80+ bits:<\/strong> excellent. Requires nation-state computational resources and decades of work. NIST&#8217;s recommended floor for high-security passwords.<\/li>\r\n<\/ul>\r\n<!-- \/wp:list>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The 16-character lowercase password \u2014 <code>jklmqzbpyhfvgxrt<\/code> \u2014 is 75 bits, comfortably \"strong\". The 8-character mixed-everything password \u2014 <code>P@ssw0rd<\/code> \u2014 is 52 bits and \"moderate\". Length wins decisively. NIST's 2024 minimum for sole-authenticator passwords is 15 characters precisely because 14 characters of even the lowercase-only pool produces ~66 bits, the entry to strong territory.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Why <code>crypto.getRandomValues<\/code> matters more than you'd think<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A \"random\" password is only random if the source of randomness is genuinely unpredictable. Two paths produce dramatically different security guarantees:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong><code>Math.random()<\/code><\/strong> \u2014 the JavaScript built-in. Seeded from a small piece of state, produces a deterministic sequence after enough samples. Browsers don't cryptographically secure this RNG. An attacker who sees a few outputs from your generator can predict the rest. <strong>Never use this for passwords.<\/strong><\/li>\r\n<li><strong><code>crypto.getRandomValues<\/code><\/strong> \u2014 the Web Crypto API. Pulls entropy from your operating system's secure random source (the same source SSH and TLS use), which combines hardware randomness with kernel state. Fundamentally unpredictable. Standard since 2014, ~100% browser support.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Our generator uses <code>crypto.getRandomValues<\/code> exclusively for character selection. This is the same primitive that 1Password, Bitwarden, and modern browser-built password generators use. The code looks like this:<\/p>\r\n\r\n\r\n\r\n<pre style=\"background: #0A2540; color: #fff; padding: 18px 20px; border-radius: 10px; overflow-x: auto; font-size: 14px; line-height: 1.5;\"><code>function pickChar(pool) {\r\n  const idx = new Uint32Array(1);\r\n  crypto.getRandomValues(idx);\r\n  return pool[idx[0] % pool.length];\r\n}\r\n\r\nconst POOL = \"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\" +\r\n             \"0123456789!@#$%^&amp;*()-_=+[]{};:,.&lt;&gt;\/?\";\r\nconst password = Array.from({length: 20}, () =&gt; pickChar(POOL)).join(\"\");<\/code><\/pre>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>The modulo bias caveat.<\/strong> Naive code that uses <code>random % pool.length<\/code> introduces a tiny bias when the random number's range isn't an exact multiple of the pool size. For 32-bit randomness and pool sizes of 26-94, the bias is negligible (under 1 part in 10\u2078). Our generator skips bias correction for brevity and clarity; in production password managers handling billions of passwords, the correction matters and is worth implementing.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Three password modes \u2014 random, pronounceable, passphrase<\/h2>\r\n\r\n\r\n\r\n<table style=\"width: 100%; border-collapse: collapse; margin: 12px 0 20px;\">\r\n<thead>\r\n<tr style=\"background: #0A2540; color: #fff;\">\r\n<th style=\"text-align: left; padding: 10px 14px;\">Mode<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">Example<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">When to use<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>Random (max entropy)<\/strong><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><code>x7G&amp;kP9vQ#m4Bz!RnT2hLcDw<\/code><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Anything stored in a password manager \u2014 never typed manually<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><strong>Pronounceable<\/strong><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><code>jokulu7tara5buse9domu<\/code><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Passwords you'll type often or read aloud over the phone<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px;\"><strong>Passphrase (Diceware)<\/strong><\/td>\r\n<td style=\"padding: 10px 14px;\"><code>Trumpet-Glacier-Mosaic-Vivid-Caramel-Forge<\/code><\/td>\r\n<td style=\"padding: 10px 14px;\">Master passwords, encryption keys, anything memorised by humans<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Random mode<\/strong> is the densest. A 20-character random password from the full pool is 131 bits \u2014 well past \"excellent\". You'll never type it manually, but a password manager handles that for you.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Pronounceable mode<\/strong> alternates consonants and vowels in syllable patterns to produce something a human can actually read and pronounce. The trade-off: lower bits per character (~3.7 vs 6.55) because the structure constrains the character choices. To compensate, generate 24-30 characters in pronounceable mode for the same security as 16-character random mode.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Passphrase (Diceware) mode<\/strong> is the human-friendly champion. A 6-word passphrase from a 7,776-word Diceware list (the original spec) gives ~77.5 bits \u2014 strong territory. From our smaller 512-word curated list (chosen for memorability and uniqueness), 6 words gives 54 bits and 8 words gives 72 bits. Add a digit or symbol between words for a small entropy bonus. The output is genuinely memorisable: <code>Trumpet-Glacier-Mosaic-Vivid-Caramel-Forge<\/code> sticks in your head after two or three reads.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">How long does it take to crack each strength level?<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Real numbers as of 2026, against three different attack contexts:<\/p>\r\n\r\n\r\n\r\n<table style=\"width: 100%; border-collapse: collapse; margin: 12px 0 20px;\">\r\n<thead>\r\n<tr style=\"background: #0A2540; color: #fff;\">\r\n<th style=\"text-align: left; padding: 10px 14px;\">Password<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">Entropy<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">vs MD5 GPU farm<\/th>\r\n<th style=\"text-align: left; padding: 10px 14px;\">vs bcrypt cost-12<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><code>password123<\/code><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">~36 bits<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Seconds (in any leak dictionary)<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Hours<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\"><code>P@ssw0rd!<\/code><\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">~52 bits<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Hours<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Months<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">14-char random alphanumeric<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">~83 bits<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">~10\u2075 years<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Beyond practical<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">20-char random alphanumeric+symbol<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">~131 bits<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Beyond age-of-universe<\/td>\r\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #e7ecef;\">Beyond age-of-universe<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"padding: 10px 14px;\"><strong>6-word Diceware passphrase<\/strong><\/td>\r\n<td style=\"padding: 10px 14px;\"><strong>~77 bits<\/strong><\/td>\r\n<td style=\"padding: 10px 14px;\">~10\u2074 years<\/td>\r\n<td style=\"padding: 10px 14px;\">Beyond practical<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The hash function the site stores your password under matters more than people realise. <strong>Sites that hash with SHA-256, MD5, or SHA-1<\/strong> (still common in legacy systems) let attackers test billions of guesses per second. <strong>Sites that hash with bcrypt, scrypt, or Argon2id<\/strong> (modern best practice) are tuned to run thousands or tens of thousands of guesses per second per attacker GPU \u2014 six orders of magnitude slower. You can't tell which a site uses, so design your password assuming the worst-case fast-hash scenario.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">How to use the browser tool<\/h2>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li>Open the <a href=\"https:\/\/simpletool.io\/tools\/strong-random-password-generator\/\">strong random password generator<\/a><\/li>\r\n<li>Pick a mode at the top \u2014 Random, Pronounceable, or Passphrase<\/li>\r\n<li>Adjust length (20 is a strong default for random; 6+ words for passphrases)<\/li>\r\n<li>Toggle character classes \u2014 uppercase, lowercase, digits, symbols. NIST 2024 says don't worry about forcing all four; lowercase-only at sufficient length is genuinely strong<\/li>\r\n<li>Tick <strong>Exclude ambiguous<\/strong> if you'll need to type or read the password (skips <code>0OIl1<\/code>)<\/li>\r\n<li>The strength bar shows entropy bits and a Weak \/ Moderate \/ Strong \/ Excellent label live<\/li>\r\n<li>Click <strong>Copy<\/strong> to grab the password (or use the eye icon to reveal\/hide it first)<\/li>\r\n<li>Click the regenerate button (circular arrow) for a fresh password \u2014 the previous five are kept in history if you preferred an earlier one<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Everything runs in your browser. We don't see, log, or transmit any password. Refresh the page and the history clears.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Storage \u2014 strong passwords are useless if you can't use them<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The password you generate is only as useful as your ability to retrieve it next Tuesday. Three storage strategies, ranked by what most security people actually recommend:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Password manager (recommended for ~all accounts).<\/strong> 1Password, Bitwarden, KeePassXC, browser built-ins. The manager remembers the password, autofills it, syncs across devices. You only need to remember one master passphrase. The master passphrase should be long (8-word Diceware minimum) and unique to that purpose.<\/li>\r\n<li><strong>Written down in a physically secure location (for the master passphrase only).<\/strong> Counter-intuitively, NIST 2024 considers a written master passphrase locked in a safe stronger than a memorised one because humans pick predictable patterns when they have to remember a password. The threat model is your attacker, not your roommate.<\/li>\r\n<li><strong>Memorised passphrase (for the master only).<\/strong> A 6-8 word Diceware phrase is genuinely memorisable. Spaced repetition (re-typing it once a day for two weeks) cements it permanently.<\/li>\r\n<li><strong>Browser autofill alone (acceptable for low-risk accounts).<\/strong> Modern browsers (Chrome, Safari, Firefox) sync strong autogenerated passwords across your devices via your account. The threat model is \"what happens if my Google account is compromised\" \u2014 for high-stakes accounts, prefer a separate password manager whose master passphrase is not your Google login.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The anti-pattern: typing strong passwords manually. A 20-character random password, typed manually, will be wrong 30% of the time on the first try and you'll start truncating it or simplifying it within a week. Generate strong \u2192 store in manager \u2192 autofill from manager. Your fingers should never touch a strong password.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">The five mistakes that reduce strong passwords to weak ones<\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Reusing the password across sites.<\/strong> The single biggest weakness in user password practice. A leak from any one site you use exposes the password to attackers who try it everywhere. Unique strong passwords per site is the only defence.<\/li>\r\n<li><strong>Substitution patterns.<\/strong> Capitalising the first letter, replacing <code>e<\/code> with <code>3<\/code>, adding <code>!<\/code> at the end. Every attacker dictionary tries these substitutions automatically. A \"password\" with leetspeak substitutions is a password that's been brute-forced in cracking demos since 2010.<\/li>\r\n<li><strong>Personal information.<\/strong> Birth year, child's name, pet's name, favourite team, address number. All scrapeable from social media or guessable from public records. Use truly random passwords; don't try to make them \"memorable\" by stuffing in personal context.<\/li>\r\n<li><strong>Predictable random patterns.<\/strong> Keyboard walks (<code>qwerty<\/code>, <code>asdfgh<\/code>), repeated characters (<code>aaaa1111<\/code>), incremental digits (<code>password1<\/code>, <code>password2<\/code>, <code>password3<\/code> per site). Crackers test all of these in seconds.<\/li>\r\n<li><strong>Storing passwords in plaintext anywhere.<\/strong> Notes apps without encryption, spreadsheets, sticky notes on your monitor. Use a password manager \u2014 even if you don't trust their cloud sync, KeePassXC keeps an encrypted database file you control completely.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">When a strong password isn't enough<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Even an excellent password can be defeated by adversaries who don't have to brute-force it. Strong passwords protect against bulk-breach scenarios; they don't protect against:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Phishing.<\/strong> A user typing their password into a fake site hands it over regardless of strength. Mitigation: pair strong passwords with multi-factor authentication (MFA) using a hardware key (YubiKey, Titan) \u2014 the gold standard since the key authenticates the destination domain.<\/li>\r\n<li><strong>Credential reuse from leaks.<\/strong> If you reused the password elsewhere and that other site got breached, attackers have your \"strong\" password in a clear-text leak. Unique-per-site is non-negotiable.<\/li>\r\n<li><strong>Keylogger malware on your device.<\/strong> No password is strong enough to resist being captured at the keyboard. Mitigation: keep your OS patched, run mainstream antivirus, and consider using a hardware password manager that types via USB-HID rather than keyboard input for high-value accounts.<\/li>\r\n<li><strong>Server-side breaches where passwords aren't even hashed.<\/strong> Some legacy systems still store passwords in plaintext or with reversible encryption. Strong passwords don't help \u2014 assume any service might leak yours and have unique passwords + 2FA per service so the leak is contained.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">For accounts with real consequences (banking, primary email, work SSO, password manager itself, government services): always pair a strong password with hardware-key MFA. The password is one of multiple factors; the hardware key prevents phishing.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">How long should a strong password be in 2026?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">NIST's 2024 minimum for sole-authenticator passwords is 15 characters. Practical recommendation: 20 characters of random alphanumeric+symbol for managed passwords, or 6-8 word Diceware passphrases for memorised passwords. Both produce ~80+ bits of entropy, well past the practical-attack threshold for any individual or commercial attacker.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Are passphrases really stronger than complex passwords?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">For equivalent length, no \u2014 they have lower bits per character because the words come from a smaller pool. But because passphrases are easier to remember at much greater lengths, they're stronger in practice. A memorised 8-word Diceware passphrase (~77 bits) is far stronger than a memorised 8-character \"complex\" password (~52 bits) because users can actually retain the longer one.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Does the password generator work offline?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Yes, after the page first loads. The generator uses your browser's built-in Web Crypto API \u2014 no server calls, no network requests, no telemetry. Once the page is open in your tab, you can disconnect from the internet and continue generating passwords. This matters for high-security workflows where you don't want any network traffic during password generation.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Should I use uppercase, digits, and symbols, or just lowercase?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">For a manager-stored password, use the full character set \u2014 there's no cost to typing it (the manager autofills) and you get more entropy per character. For a passphrase you'll type or read aloud, lowercase + word separators is fine: a 6-word lowercase passphrase has more entropy than a 12-character mixed-case password and is much easier to enter correctly.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">What does \"ambiguous characters\" mean and should I exclude them?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ambiguous characters are <code>0<\/code> (zero), <code>O<\/code> (uppercase O), <code>1<\/code> (one), <code>l<\/code> (lowercase L), and <code>I<\/code> (uppercase i) \u2014 visually similar in many fonts. Exclude them when you'll need to read or type the password (e.g., a temporary password to share over the phone). Don't exclude them for manager-stored passwords \u2014 every character you exclude reduces entropy slightly.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Is my generated password sent anywhere?<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">No. Every operation runs in your browser using the Web Crypto API. The password is generated locally, displayed locally, and (if you click copy) copied to your clipboard locally. We have no server-side processing for password generation; there's literally no code path that could transmit it. Verify by opening browser DevTools \u2192 Network tab and watching for any request when you regenerate.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Related tools and guides<\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><a href=\"https:\/\/simpletool.io\/tools\/strong-random-password-generator\/\">Strong Random Password Generator<\/a> \u2014 the tool this guide is about<\/li>\r\n<li><a href=\"https:\/\/simpletool.io\/tools\/sha256-hash-generator\/\">SHA-256 Hash Generator<\/a> \u2014 for HMAC keys, API tokens, and signing scenarios<\/li>\r\n<li><a href=\"https:\/\/simpletool.io\/blog\/free-sha256-hash-generator\/\">Free SHA-256 Hash Generator guide<\/a> \u2014 when SHA-256 is the right tool and when it isn't<\/li>\r\n<li><a href=\"https:\/\/simpletool.io\/tools\/list-randomizer\/\">List Randomizer<\/a> \u2014 for fair shuffling using the same crypto.getRandomValues source<\/li>\r\n<li><a href=\"https:\/\/simpletool.io\/tools\/qr-code-generator\/\">QR Code Generator<\/a> \u2014 encode WiFi credentials to share without typing the password aloud<\/li>\r\n<li><a href=\"https:\/\/simpletool.io\/miscellaneous-tools\/\">All miscellaneous tools<\/a> \u2014 passwords, PDF utilities, QR codes, and more<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p><script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"How long should a strong password be in 2026?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"NIST's 2024 minimum for sole-authenticator passwords is 15 characters. 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A memorised 8-word Diceware passphrase (~77 bits) is far stronger than a memorised 8-character complex password (~52 bits) because users can actually retain it.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does the password generator work offline?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes, after first page load. The generator uses your browser's Web Crypto API \u2014 no server calls, no network requests, no telemetry. Once the page is open, you can disconnect from the internet and continue generating passwords. This matters for high-security workflows.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should I use uppercase, digits, and symbols, or just lowercase?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"For a manager-stored password use the full character set \u2014 no cost to typing it and more entropy per character. For a passphrase you'll type or read aloud, lowercase + word separators is fine: a 6-word lowercase passphrase has more entropy than a 12-character mixed-case password and is easier to enter correctly.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What does 'ambiguous characters' mean and should I exclude them?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Ambiguous characters are 0 (zero), O (uppercase O), 1 (one), l (lowercase L), and I (uppercase i) \u2014 visually similar in many fonts. Exclude them when you'll read or type the password aloud. Don't exclude for manager-stored passwords \u2014 each excluded character reduces entropy slightly.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is my generated password sent anywhere?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. Every operation runs in your browser using the Web Crypto API. The password is generated locally, displayed locally, and copied locally. There's no server-side processing \u2014 no code path that could transmit it. Verify by opening browser DevTools Network tab and watching for any request when you regenerate.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script><\/p>\r\n\r\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Generate cryptographically secure passwords with the Web Crypto API. NIST-aligned length-over-complexity, entropy math, passphrases, zero server transmission.<\/p>\n","protected":false},"author":2,"featured_media":38,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,30,6],"tags":[29,23,15],"class_list":["post-39","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-free-tools","category-passwords","category-tutorials","tag-passwords","tag-privacy","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Strong Random Password Generator: NIST-Aligned &amp; Secure<\/title>\n<meta name=\"description\" content=\"Generate cryptographically secure passwords with the Web Crypto API. 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