What actually makes a password strong — length or complexity?

Length matters far more. Entropy scales as length times log2(character-pool size), so adding characters compounds exponentially while adding more symbol types only compounds linearly. A 20-character all-lowercase password is stronger than an 8-character password mixing every character type. Use both when a service allows it, but prioritize length first.

Is it safe to generate passwords using an online tool?

It is safe with this tool specifically because generation uses the Web Crypto API entirely inside your browser — nothing is sent to a server, logged, or stored anywhere. Be cautious of other "generators" that submit the password to a backend for "strength checking," since that defeats the purpose.

How should I store generated passwords?

Use a reputable password manager such as Bitwarden, 1Password, or KeePass. Never store passwords in a plain text file, spreadsheet, browser-saved autofill without a master password, or note-taking app, and never reuse a password across more than one account.

Why does the strength meter still show "Fair" for a 12-character password with all four character types?

The meter weighs both length and character diversity, and 12 characters — even with full diversity — sits at roughly 78 bits of entropy, which is adequate but not top-tier by modern standards. Pushing to 16+ characters moves the same password into "Strong" territory.

What is the difference between Math.random() and crypto.getRandomValues()?

Math.random() is a fast pseudo-random generator designed for simulations and games, not security — its internal state is deterministic and, in some JavaScript engines, can be reconstructed from a handful of observed outputs. crypto.getRandomValues() draws from the operating system's cryptographic entropy source, the same one used to generate TLS keys, making its output unpredictable even to an attacker who has seen previous outputs.

Should I exclude symbols if a site's password field rejects them?

Yes — some legacy systems only accept a limited symbol set or reject symbols entirely. If that happens, uncheck Symbols and compensate by increasing length, since length recovers more entropy than symbols contribute anyway.

Can I use this generator to create a secret key for signing JWTs or API tokens?

Yes. A 32+ character password generated with all character sets enabled provides more than enough entropy for an HMAC signing secret. For binary-safe secrets, you may also want a hex or base64-encoded random string from the Hash Generator tool instead.

Why exclude ambiguous characters like 0, O, l, 1, and I?

These characters look nearly identical in many fonts. If a password will ever need to be typed manually — read from a printed recovery sheet, entered on a TV remote, or dictated over the phone to IT support — ambiguous characters cause real login failures. If the password will only ever be pasted from a manager, you can safely leave them included for slightly higher entropy.

Is a randomly generated password better than a memorable passphrase?

For raw entropy per character, yes — a random password packs more unpredictability into fewer characters. A passphrase of several random dictionary words can reach similar entropy but needs more characters to get there. If you must memorize the credential yourself, a passphrase is more practical; if it lives in a password manager, a fully random generated password is more efficient.

How many passwords should I generate at once?

Generate exactly as many as you need for the accounts you are creating right now — there is no benefit to stockpiling unused random passwords, and each one should be assigned to a single account and stored immediately in your password manager.

All ToolsPassword Generator

Password Generator

Generate secure random passwords using the Web Crypto API. Customize length and character sets.

ilovedocstools.com

Password Generator

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What is Password Generator?

Password Generator is a free online tool that creates cryptographically secure random passwords using the browser's built-in Web Crypto API (crypto.getRandomValues). Customize length, character sets, exclude ambiguous characters, and generate multiple passwords at once — all without sending anything to a server.

Weak and reused passwords are the leading cause of account compromise. Dictionary attacks try common words and known-breached passwords first; credential stuffing takes a password leaked from one breached site and automatically tries it against thousands of other services, betting correctly that people reuse passwords; brute force simply tries every possible combination until one works. All three exploit predictability — either predictable word choices or a search space small enough to exhaust. The only reliable defense is a long, high-entropy password that is unique to each individual service, so a breach anywhere else never puts other accounts at risk.

Entropy is what actually determines how hard a password is to crack, and it is a function of both length and the size of the character pool, not "complexity" in the way people usually think about it. A 20-character password using only lowercase letters (26 possible characters per position) has roughly 94 bits of entropy — 20 × log2(26) — which is already far stronger than an 8-character password mixing upper, lower, numbers, and symbols (94 possible characters per position), which comes out to only about 52 bits. This is why security guidance has shifted over the last decade from "use a short password with mixed case, numbers, and symbols" toward "use a long password" — length compounds exponentially, character-set size only compounds linearly. This generator lets you push length up to 128 characters and independently toggle every character set, so you can dial in exactly the entropy a given service's password rules will accept.

Generation itself uses crypto.getRandomValues() rather than Math.random(). Math.random() is a pseudo-random number generator seeded for statistical distribution, not unpredictability — its internal state can in some engines be inferred from observed outputs, which makes it unsuitable for anything security-related. crypto.getRandomValues() pulls from the operating system's cryptographically secure random number generator, the same entropy source browsers use for TLS session keys, so the output is not just well-distributed but genuinely unpredictable.

You can also opt to exclude visually ambiguous characters (0, O, l, 1, I) that cause real-world friction when a password has to be typed manually — read off a screen, typed on a phone, or dictated over a call — rather than pasted from a manager. A real-time strength indicator rates the output using an entropy-aware scoring model rather than a naive length check. Generated passwords never leave your browser: there is no server-side logging, no API call, and no account required. For actual use, store the generated password immediately in a reputable password manager such as Bitwarden, 1Password, or KeePass rather than a text file, spreadsheet, or sticky note.

How It Works

The tool assembles a character pool from your selected sets (uppercase, lowercase, numbers, symbols), optionally strips ambiguous characters from that pool, then calls crypto.getRandomValues() to fill a typed array with cryptographically random 32-bit integers — one per character position. Each random integer is mapped to a character in the pool using modulo indexing, so the final password draws uniformly from the full available character set. This avoids the statistically weak, seedable pseudo-randomness of Math.random() and produces output with genuine cryptographic entropy suitable for real account security, API keys, and secrets.

How to Use

1
Set the password length
Use the slider or type a value from 8 to 128. Since entropy scales with length, prefer 16 or more characters whenever the target service allows it.
2
Choose character sets
Toggle uppercase letters, lowercase letters, numbers, and special symbols independently to match the password rules of the account or system you are creating a credential for.
3
Exclude ambiguous characters if needed
Check this box if the password may ever be typed manually rather than pasted, to avoid 0/O and l/1/I confusion.
4
Set how many to generate
Enter a count from 1 to 20 if you need several unique passwords at once, for example when provisioning multiple new accounts in a batch.
5
Generate
Click "Generate Password" to produce new random passwords using cryptographically secure randomness from the Web Crypto API.
6
Check the strength meter
Review the entropy-based Weak, Fair, Good, or Strong rating before committing to a password for a sensitive account.
7
Copy and store immediately
Copy the password to your clipboard and paste it directly into a password manager such as Bitwarden, 1Password, or KeePass — never into a plain text file.

Who Uses This Tool

🔐

Account Registration

Generate a strong unique password for each new account signup to avoid credential reuse across services.

🛡️

Service Account Secrets

Create long random secrets for service accounts, API keys, and database passwords in backend systems.

📧

Temporary Access Credentials

Generate one-time passwords for temporary user accounts or shared access scenarios.

🔑

JWT Secret Key Generation

Produce a 256-bit random string to use as the HMAC secret key when signing JSON Web Tokens.

💾

Encryption Key Creation

Generate high-entropy strings for use as encryption keys or initialization vectors in cryptographic workflows.

🧪

Test Account Setup

Create realistic strong passwords for test user accounts in development and staging environments.

Why Choose This Tool

Cryptographically Secure

Uses crypto.getRandomValues — the same entropy source as TLS — guaranteeing truly unpredictable passwords.

Flexible Character Sets

Toggle uppercase, lowercase, numbers, and symbols independently to match any password policy requirement.

Ambiguous Character Exclusion

Optionally exclude characters like 0, O, l, 1, and I that are easy to confuse when reading or typing.

Bulk Generation

Generate up to 20 passwords at once and copy them all to a clipboard for batch account creation.

Strength Indicator

A real-time strength meter rates your password Weak, Fair, Good, or Strong based on length and character diversity.

Never Transmitted

Passwords are generated entirely in your browser — they are never sent to any server or logged anywhere.

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Key Benefits

Uses crypto.getRandomValues for cryptographically secure randomness
Customizable length from 8 to 128 characters
Independently toggle uppercase, lowercase, numbers, and symbols
Exclude ambiguous characters (0, O, l, 1, I) for manual typing accuracy
Generate 1–20 passwords at once and copy all in one click
Entropy-aware strength meter, not a naive length-only check
No password is ever transmitted, logged, or stored on any server
Works instantly with no account, sign-up, or rate limit

Frequently Asked Questions

Also Known As

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