Password Length Comparison

How much difference do four extra random characters make? Choose two lengths and a character set to see how the theoretical search space changes. This tool never asks you to type a password.

First password lengthSecond password length

Assumed random character pool

First password

71.5 bits

Second password

95.3 bits

Difference: +23.8 bits. The second has a larger theoretical search space.

Assumes independent, uniform random selection from the specified pool. This is not a real-world crack-time prediction.

Why length matters

For uniformly random passwords, every added character multiplies the number of possibilities by the size of the allowed character set. Four extra characters from a 62-character set multiply the search space by 62⁴, or 14,776,336. This does not mean every attacker needs that many more guesses: real attacks depend on the system and the password's origin.

Length isn't everything

Long passwords created from song lyrics, common phrases, names, or predictable keyboard patterns are not equivalent to uniformly random strings. Reusing any password across sites also increases account risk, regardless of its length.

For real accounts, use a password manager to create and store unique random passwords, and enable multi-factor authentication where possible. Explore the entropy calculator or read our password length guide.