// set length, charset, and rules to generate secure passwords
Generate strong, secure passwords with custom length, charset rules, and patterns. Set uppercase, lowercase, numbers, symbols, and exclusions. Free browser-based.
Ready to generate
Configure your rules and click GenerateDrag the slider or type a number from 4 to 256.
Toggle uppercase, lowercase, numbers, and symbols on or off.
Exclude ambiguous chars, prevent repeats, set quantity, then click Generate.
The Advanced Password Generator lets you create cryptographically strong passwords with full control over length, character sets, and generation rules — all processed locally in your browser with no data sent anywhere.
No. This tool runs entirely in your browser using JavaScript. No passwords, settings, or any data are ever transmitted to our servers or any third party. Everything stays on your device.
A strong password is long (16+ characters), uses a mix of character types (uppercase, lowercase, numbers, symbols), avoids dictionary words, and is unique for each account. Our strength meter evaluates entropy based on your selected charset pool and length.
Ambiguous characters like 0 (zero) vs O (letter O), or l (lowercase L) vs 1 (one) vs I (uppercase i) look very similar in many fonts. Excluding them reduces typos when reading or typing passwords manually.
You can generate up to 50 passwords in a single batch. This is useful for creating multiple unique passwords for team members or seeding a password manager with fresh credentials.
Entropy measures how unpredictable a password is, expressed in bits. A higher entropy means a password is harder to brute-force. For example, a 20-character password using all charset types has around 130 bits of entropy — far beyond what current computers can crack.
Yes. Uncheck the "Symbols" toggle to generate passwords using only letters and numbers. Some systems or old websites don't accept special characters in passwords, so this option handles that case.
This rule ensures the generated password contains at least one character from every enabled charset. For example, if uppercase, lowercase, numbers, and symbols are all enabled, the password will always include at least one of each type.
You can type any length from 4 to 256 directly in the number input. The slider goes up to 128 for convenience, but the number field accepts values up to 256. For most use cases, 16–32 characters provides excellent security.
Creating strong, unique passwords is the single most impactful thing you can do to protect your online accounts. Yet most built-in password generators offer little control — a simple slider and a "Generate" button. Our Advanced Password Generator is different. It gives developers, security professionals, and privacy-conscious users complete control over every aspect of password creation.
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Security researchers have demonstrated that password length is the dominant factor in resistance to brute-force attacks. A 20-character password using only lowercase letters has more entropy than a 10-character password using all character types. That said, combining length and character variety produces the strongest results. Our generator lets you maximize both simultaneously.
The slider provides a quick visual interface for common lengths (4–128 characters), while the number input field accepts values up to 256 characters for specialized use cases like encryption keys, API secrets, or token seeds.
Most password situations call for different character rules. A WiFi password you'll need to type on a TV remote benefits from fewer symbols. An SSH key passphrase can be as complex as possible since you'll copy-paste it. Our charset toggles cover all scenarios:
Beyond character sets, the Advanced Password Generator offers three behavioral rules that solve real-world password problems:
0 vs O, l vs 1 vs I. Essential when passwords need to be read aloud or transcribed manually.Some environments have quirky restrictions. Certain databases reject passwords with semicolons. Some APIs break if the key contains backslashes. The custom exclusion field lets you type any specific characters you want removed from the possible pool before generation. This is particularly valuable in enterprise environments or when interfacing with legacy systems.
Need passwords for a team of 20? Setting up test accounts in a CI pipeline? The quantity selector lets you generate up to 50 passwords at once, each independently randomized with the same ruleset. Copy All grabs every generated password in a newline-separated list, ready to paste into a spreadsheet or config file.
The strength meter displayed above the results calculates the estimated entropy of the generated passwords based on the effective character pool size and length. Entropy is measured in bits — each additional bit doubles the number of attempts required to brute-force the password. Modern security guidelines recommend:
Privacy is non-negotiable when generating passwords. Our tool uses the crypto.getRandomValues() Web Cryptography API — the same cryptographically secure random number generator used by your operating system. No network requests are made during generation. You can even disconnect from the internet after loading the page and the tool will continue working perfectly.
Generating strong passwords is only half the battle. Here are the most important practices to protect your accounts:
The Advanced Password Generator is built for users who need more than a basic random string. Developers generating API keys, security engineers auditing password policies, system administrators creating service account credentials, and privacy-focused individuals who want fine-grained control will all find the extra options valuable. Casual users who just need a quick secure password can ignore the advanced options and click Generate with the defaults — which are already configured to produce strong, balanced passwords out of the box.