Free Strong Password Generator — Secure & Random Passwords
Generate strong, random, secure passwords with custom length, uppercase, numbers and symbols. 100% client-side — no passwords sent to any server.
This tool is part of PDFLocal's full productivity suite. Access it on the main dashboard:
Open Free Strong Password Generator ToolFree Strong Password Generator — Secure & Random Passwords
Generate strong, random, secure passwords with custom length, uppercase, numbers and symbols. 100% client-side — no passwords sent to any server. This tool runs 100% in your browser — your data is never sent to any server, logged, or stored anywhere outside your own device. This makes PDFLocal the most private choice for handling sensitive text, images, or file data.
Frequently Asked Questions
How are passwords generated — are they truly random?
PDFLocal uses the browser's built-in Web Crypto API (specifically window.crypto.getRandomValues()) to generate passwords. This API uses a cryptographically secure pseudo-random number generator (CSPRNG) seeded by the operating system's entropy sources (hardware timing, mouse movements, keyboard timings, and other system events). This is the same randomness source used by security software, cryptographic libraries, and banking applications. It is fundamentally different from Math.random() which is not cryptographically secure. The generated passwords are therefore genuinely random and unpredictable — no generated password in a session reveals information about other generated passwords.
What makes a password "strong"?
Password strength is determined by the total number of possible passwords of a given length and character set — known as entropy, measured in bits. The more entropy, the longer it would take to crack the password by trying every possibility (a brute force attack). Key factors: Length is the most important factor — each additional character multiplies the number of possibilities. Character set diversity (using uppercase + lowercase + numbers + symbols) significantly increases the character pool from 26 to 94+ characters per position. Avoid predictable patterns — dictionary words, dates, names, or keyboard walks (qwerty, 12345) that attackers test first. A 16-character password using all character types has approximately 105 bits of entropy — with current hardware, cracking it by brute force would take longer than the age of the universe.
Is it safe to use an online password generator?
PDFLocal's password generator is specifically designed to be safe for generating sensitive passwords because it runs entirely in your browser without any network communication. The generated passwords are computed by your own device's processor and never transmitted over the internet to any server. You can verify this by disconnecting from the internet and testing that the tool continues to generate passwords (it will, because all the code runs locally). Compare this with server-side password generators — if a website generates passwords on their server and sends them to you, they theoretically have a record of your generated passwords. PDFLocal eliminates this risk entirely.
How long should my passwords be?
For most online accounts, 16 characters is the recommended minimum, combining uppercase, lowercase, numbers, and symbols. For extremely sensitive accounts (banking, primary email, password manager master password), 20-24 characters is advisable. For passwords that need to be memorized rather than stored in a password manager, a passphrase (4-6 random common words) is both more secure than a short complex password and more memorable — for example "correct-horse-battery-staple" has more entropy than "P@ssw0rd!" despite being simpler to remember. The absolute most important practice is to use a unique password for every account so that a breach of one service does not compromise others.