Security
Alphanumeric Password Generator
Generate random alphanumeric passwords (A-Z, a-z, 0-9). No special characters. Compatible with all systems. Free, browser-based, no signup.
About this alphanumeric password generator
Alphanumeric passwords — letters and numbers only, no symbols — are the most universally compatible password format. Every system, device, and platform accepts them without issues. With 62 possible characters (26 uppercase + 26 lowercase + 10 digits), each character contributes ~5.95 bits of entropy. A 16-character alphanumeric password provides ~95 bits — strong enough for virtually any use case. This format avoids the common frustrations of symbol-containing passwords: copying issues in terminals, escaping problems in shell scripts, encoding errors in URLs, and rejection by systems with restrictive character policies. If you use a password manager and never type passwords manually, symbols add marginal value. Many security professionals use alphanumeric passwords with increased length as their default choice.
FAQ
Common questions
Is alphanumeric as secure as passwords with symbols?
Nearly. Each alphanumeric character gives ~5.95 bits vs ~6.57 bits with symbols. A 16-character alphanumeric password (~95 bits) is comparable to a 14-character mixed password (~92 bits). Add 2-3 characters to match the entropy of a shorter symbol-containing password.
Why choose alphanumeric over full complexity?
Universal compatibility — no system rejects alphanumeric passwords. No escaping issues in scripts, config files, or URLs. Easy to type on any keyboard layout. The minor entropy loss per character is easily offset by adding 1-2 extra characters.
What systems have trouble with special characters?
Shell scripts (characters like $ and ! have special meaning), older databases, URL parameters (& and = conflict), XML/HTML (< and > cause parsing issues), and some IoT devices with limited keyboard input.
How long should an alphanumeric password be?
At least 16 characters for personal accounts, 20+ for sensitive accounts, 32+ for infrastructure credentials. The goal is to match or exceed 80 bits of entropy for personal use and 128+ bits for infrastructure.
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