Generate 4 Character Password

A 4-character password using mixed letters and numbers can be cracked in under one second by modern brute-force tools. With only about 1.6 million possible combinations, even basic hardware can cycle through every possibility almost instantly. Never rely on a 4-character password for any account that holds personal or financial data.

Yes, 4-character codes are commonly used for device screen locks, luggage locks, and one-time verification codes sent via SMS. In these cases the short length is acceptable because the system typically locks out after several failed attempts, adding a layer of protection that compensates for the low entropy.

Adding symbols slightly increases the number of possible combinations, but at only 4 characters the improvement is negligible. A 4-character password with symbols can still be cracked in seconds. If security matters, increasing the length to 12 or more characters is far more effective than adding symbols to a short password.

A 4-character numeric PIN is acceptable for a child's tablet because the device usually enforces lockout after repeated wrong attempts. However, make sure the tablet itself is not tied to accounts with payment methods or sensitive data. For any online accounts associated with the device, use a longer, stronger password.