Secure Password Generator
Generate strong, cryptographically secure passwords with our free password generator. Customise length from 8 to 128 characters, choose character types (uppercase, lowercase, numbers, symbols), and exclude ambiguous characters for better readability. Each password includes real-time strength analysis with precise entropy measurement in bits and estimated crack time - all powered by the Web Crypto API and running locally in your browser. No signup, no data upload, complete privacy.
Configure options below and generate
0 O 1 l I 5 S 8 B
🔐 Security Note: Passwords are generated usingcrypto.getRandomValues()- a cryptographically secure random number generator available in all modern browsers. Generated passwords are never stored, logged, or transmitted. The browser history feature is only visible to you and stored in memory.
Why Use Our Password Generator?
Cryptographically Secure Generation
Passwords are generated using the Web Crypto API's `crypto.getRandomValues()` method - the same cryptographically secure random number generator used by browsers for TLS and encryption. This ensures true randomness that cannot be predicted or reproduced, unlike the standard `Math.random()` which is unsuitable for security purposes. Each generated password is unique and unpredictable.
Real-Time Strength & Entropy Analysis
Every generated password includes instant strength feedback with a visual colour-coded bar (Very Weak to Very Strong), precise entropy measurement in bits, estimated crack time (from seconds to centuries), and character composition metrics. The entropy calculation accounts for character pool size and password length, giving you an accurate measure of cryptographic strength based on industry-standard formulas.
Full Customisation Options
Control every aspect of your password: length (8-128 characters), character types (uppercase A-Z, lowercase a-z, numbers 0-9, symbols), and ambiguous character exclusion (0, O, 1, l, I, 5, S, 8, B). The generator ensures at least one character from each selected type is included, guaranteeing your password meets common complexity requirements for websites and applications.
One-Click Copy & Session History
Copy any generated password to your clipboard with a single click. The last 20 generated passwords are kept in session memory (not localStorage), making it easy to go back to a previous password if needed. Toggle visibility with the show/hide button to verify characters before copying. All passwords are cleared when you close the browser tab.
Common Use Cases
Personal Account Security
Generate strong, unique passwords for your email, social media, shopping, and entertainment accounts. Using the same password across multiple services is one of the most common security risks. Generate a unique 20+ character password for each account and store them in a password manager for maximum protection against credential stuffing attacks.
Financial & Banking Credentials
Banking, investment, and payment accounts require the highest level of protection. Use the generator with all character types enabled (uppercase, lowercase, numbers, symbols) and a length of 25+ characters. Exclude ambiguous characters to make manual entry easier when needed, and verify the high strength rating before saving.
Work & Enterprise Accounts
Corporate IT policies often require passwords meeting specific complexity requirements. The generator's character type toggles let you match any policy: minimum length, required character types, and ambiguous character exclusions. Generate passwords that satisfy enterprise Active Directory or SSO requirements while maintaining high entropy.
Shared & Temporary Access
Generate temporary passwords for guest accounts, shared team logins, or service access. The adjustable length lets you create shorter passwords (8-12 characters) that are still secure enough for limited-use scenarios. Copy and share via a secure channel, and regenerate regularly for ongoing access.
API Keys & Service Tokens
Many services, hosting providers, and APIs require strong access tokens or Application Passwords. Generate 40-60 character passwords with all character types for maximum API security. The show/hide toggle helps you verify the full token before copying it into configuration files or deployment tools.
Security Awareness & Education
Use the password generator as a teaching tool to demonstrate what makes a password strong. The real-time entropy display and crack time estimation help illustrate why longer passwords with more character types are significantly more secure. Compare the strength of a short password vs a long one to build better security habits.
About This Tool
What Is a Secure Password Generator?
A secure password generator creates strong, random passwords that are resistant to guessing and brute-force attacks. Unlike humans, who tend to create predictable passwords based on words, dates, and patterns, a cryptographic random generator produces passwords with maximum entropy - meaning every possible combination of characters is equally likely. Our generator uses the Web Crypto API's `crypto.getRandomValues()` method, which is the same cryptographically secure random source used by browsers for TLS encryption, ensuring your passwords are truly unpredictable.
How the Password Generator Works
Select your desired options: password length (8-128 characters), which character types to include (uppercase, lowercase, numbers, symbols), and whether to exclude ambiguous characters (0, O, 1, l, I, 5, S, 8, B). When you click Generate, the tool creates a cryptographically secure random byte array using `crypto.getRandomValues()`, maps each byte to a character from the selected pool, and ensures at least one character from each selected type is present. The password is displayed with real-time strength analysis - entropy in bits, strength score (0-100), and estimated crack time.
Understanding Password Strength & Entropy
Entropy measures the unpredictability of a password in bits. Each bit doubles the number of possible combinations an attacker must try. A password with 40 bits of entropy can be cracked in seconds, while 80 bits takes centuries with current technology. The formula is: log₂(character pool size) × password length. For example, a 20-character password using all character types (pool of 95) has approximately 131 bits of entropy - far beyond what any computer could crack in a lifetime. The strength meter provides a visual representation of this cryptographic measure, not a subjective opinion.
Privacy & Security
This password generator runs entirely in your browser. Generated passwords are created using the Web Crypto API and never leave your device. They are not stored, logged, or transmitted to any server. The session history is kept only in browser memory and is cleared when you close the tab. No cookies, no tracking, no data collection. For maximum security, we recommend using a dedicated password manager to store generated passwords.
Related Tools
Meeting Time Zone Planner
Find overlapping working hours for participants in different time zones - visual 24-hour timeline, 60+ IANA time zones, DST-accurate, up to 8 participants - Free online meeting planner
Meeting Agenda Builder
Create structured meeting agendas with time slots, presenter assignments, and notes. Export as plain text or PDF - Free online meeting agenda builder.
Meeting Scheduler (Availability Matrix)
Plan your week by entering available time slots across multiple days. Set meeting duration and buffer preferences, then generate an optimised weekly timetable that maximises focused work time - all running locally in your browser, no signup required. Free online Meeting Scheduler.
Task Deadline Calculator
Calculate the actual deadline considering working days only. Enter a due date, exclude weekends and holidays (with country presets), and see the number of working days remaining. Also calculates backwards: if a task takes N working days, when should you start?