🔒 Password Generator
Generate strong, secure passwords. Cryptographically random, never stored or transmitted.
Last updated: May 18, 2026 · By Λ
Free Secure Password Generator
Create strong, unique passwords using cryptographically secure randomness (Web Crypto API). Customize length from 4 to 128 characters, choose character sets, and exclude ambiguous characters. Each password comes straight out of crypto.getRandomValues on your own machine and exists only in your tab until you copy it somewhere. Includes password strength estimation based on entropy. Generate multiple passwords at once for batch use.
What is a Password Generator?
A password generator creates random strings of characters that are difficult to guess or crack through brute force attacks. Strong passwords are the first line of defense for your online accounts, and manually creating them is both tedious and prone to human biases. People tend to pick predictable patterns, reuse familiar words, or rely on simple substitutions that attackers can easily anticipate. A proper generator eliminates these weaknesses by producing truly random output.
This tool uses the Web Crypto API, the same cryptographically secure random number generator that browsers use for SSL/TLS connections. Unlike Math.random(), which produces pseudo-random numbers that can be predicted, the Web Crypto API draws from your operating system's entropy pool to produce values that are suitable for security-sensitive applications. Best of all, the generated passwords never leave your browser. Nothing is transmitted, logged, or stored anywhere.
How to Use This Tool
- Adjust the length slider to set your desired password length, from 4 to 128 characters. Most security experts recommend at least 16 characters for strong protection.
- Choose which character sets to include: uppercase letters, lowercase letters, digits, symbols, and brackets. You can also exclude ambiguous characters like 0, O, I, l, and 1 that are easy to confuse.
- Click "Generate" to create a new password, or simply adjust the settings and the password updates automatically. The strength meter and entropy estimate update in real time.
- Click the password display or the Copy button to copy it to your clipboard. Use "Generate 10" to produce a batch of passwords at once for setting up multiple accounts.
Key Features
- Cryptographic Randomness - Uses the Web Crypto API for true randomness, not pseudo-random sequences that can be reverse-engineered.
- Entropy Estimation - Displays the password's entropy in bits, giving you a precise measure of its strength rather than a vague label.
- Flexible Character Sets - Mix and match uppercase, lowercase, digits, symbols, and brackets to meet any password policy requirements.
- Ambiguous Character Exclusion - Remove characters like 0/O and I/l/1 that look similar in many fonts, reducing errors when typing passwords manually.
- Bulk Generation - Generate 10 passwords at once, perfect for provisioning accounts, creating API keys, or filling a password manager with fresh credentials.
Frequently Asked Questions
How long should my password be?
For most purposes, 16 characters or longer is a good minimum. A 20-character password using all character sets provides over 130 bits of entropy, which is far beyond what any current technology can brute-force. For high-security applications like encryption keys, consider 32 characters or more.
Are the generated passwords stored or sent anywhere?
No. Passwords are generated entirely in your browser's memory and are never transmitted over the network. There is no server-side component, no analytics tracking, and no logging. You can even use this tool offline after the page has loaded.
What does "entropy" mean in the context of passwords?
Entropy measures the unpredictability of a password in bits. Each bit of entropy doubles the number of possible combinations an attacker must try. A password with 80 bits of entropy has 2^80 possible combinations, which would take billions of years to crack with current hardware. The higher the entropy, the more secure the password.
Should I use symbols in my passwords?
Including symbols significantly increases the character pool, which raises entropy per character. However, some older systems or specific applications may not accept certain special characters. If you encounter restrictions, you can disable symbols and compensate by increasing the password length to maintain the same overall security level.