Random Password Generator
Generate strong, secure random passwords with customizable length and character types.
About Random Password Generator
The Random Password Generator creates cryptographically secure login credentials for websites, apps, and services. It draws from up to four character sets — digits (0-9), lowercase letters (a-z), uppercase letters (A-Z), and symbols (!@#$%^&*...) — and uses the browser Web Crypto API (crypto.getRandomValues) to pick each character. The result is a password with genuine entropy that cannot be predicted even if an attacker knows the tool you used.
Four quick presets cover the most common needs: Basic (8 chars, letters and numbers) for low-stakes accounts; Strong (16 chars, all character types) for email or banking logins; Ultra (32 chars, all types, similar characters excluded) for master passwords and password managers; and PIN (4 digits) for numeric-only entry points. You can also drag the length slider anywhere from 4 to 128 characters and toggle individual character types to match a specific site's password rules. The tool instantly recalculates the password's entropy in bits, maps it to a Weak/Medium/Strong/Very Strong label, and estimates crack time assuming 10 billion guesses per second — giving you a real measure of how long the credential would hold against a dedicated attack.
Every calculation and every generated password stays on your device. Nothing is transmitted, logged, or stored on a server. You do not need to create an account, install anything, or pay. Once the page has loaded, the generator works entirely offline — the same strong password you see is the one only you have.
Key Features
Cryptographic randomness via Web Crypto API
Each character is selected using crypto.getRandomValues, which draws from the operating system's entropy pool rather than a predictable pseudo-random algorithm.
Live entropy and crack-time display
As you change length or character types the tool recalculates entropy in bits and shows estimated crack time at 10 billion guesses per second, so you can see the real security impact of each choice.
Four one-click presets
Basic, Strong, Ultra, and PIN presets apply tested length and character-type combinations in a single click, covering the most common account scenarios without manual configuration.
Exclude Similar Characters option
Toggling this removes visually ambiguous characters — 0, O, o, l, I, 1 — so the password can be transcribed by hand or read aloud without misreading a character.
Length slider from 4 to 128 characters
A range input lets you fine-tune length to match a site's specific maximum or minimum requirement, from a 4-digit PIN to a 128-character master passphrase.
Instant copy to clipboard
One button copies the generated password directly to your clipboard. The button confirms the copy with a checkmark for two seconds so you know the transfer succeeded.
How to Use
Set Your Preferences
Choose a quick preset or customize the password length and character types using the slider and checkboxes.
Generate Password
Click "Generate" or adjust any setting to instantly create a new cryptographically secure password.
Copy & Use
Click the copy button to save your password to the clipboard and use it wherever you need a strong password.
Example
The Strong preset (16 chars, all character types enabled) produces a password with roughly 105 bits of entropy — estimated crack time over a trillion years at 10 billion guesses per second.
Preset: Strong
Length: 16
Numbers: on
Lowercase: on
Uppercase: on
Symbols: on
Exclude Similar: offg7!Kx#mQ2eRv@Lp9
Strength: Very Strong
Entropy: ~105 bits
Crack time: Centuries+Common Use Cases
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Creating new account passwords
Whenever you sign up for a website or app, generate a unique password with the Strong or Ultra preset instead of reusing an existing one. Each account gets its own unguessable credential, so a breach on one site cannot compromise the others.
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Replacing weak or reused passwords
If a data-breach alert tells you a password was exposed, generate a fresh one here in seconds. The strength meter confirms the replacement is genuinely stronger before you commit to the change.
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Generating a master password for a password manager
Password managers protect everything behind one credential. The Ultra preset — 32 characters with all types and similar characters excluded — produces a passphrase strong enough for that role while remaining readable enough to type from memory if needed.
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Creating passwords that must be typed by hand
Some devices (routers, smart TVs, kiosks) do not support paste. The "Exclude Similar Characters" option removes easily confused glyphs so you can transcribe the password from screen to keyboard without error.
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Setting numeric PINs for devices and accounts
The PIN preset produces a 4-digit numeric code for phone lock screens, bank cards, or any system that only accepts digits — using the same cryptographic randomness as the full password presets.