Guides · 2026-02-20
How Strong Is My Password? (And How to Make a Better One)
Learn what actually makes a password strong, how attackers crack weak ones, and how to generate an uncrackable password for free.
"Password123!" feels secure because it has a capital letter, a number, and a symbol. In reality, an attacker's computer would guess it almost instantly. Here's what truly makes a password hard to crack — and how to create one for free.
Length beats complexity
Every character you add multiplies the number of possible combinations. A 16-character password drawn from letters, numbers, and symbols has so many possibilities that brute-forcing it is infeasible with today's hardware. A clever 8-character password is not — short passwords fall in seconds to hours.
Why "complex" short passwords fail
Attackers don't guess randomly. They use dictionaries of common words, names, and predictable substitutions (a→@, o→0). "P@ssw0rd" is in every cracking list. Real strength comes from randomness, not from swapping a few letters.
Measure strength with entropy
Entropy (measured in bits) estimates how unpredictable a password is. Under ~50 bits is weak, 80+ bits is strong. A 16-character random password mixing all character types lands around 100+ bits — comfortably uncrackable. Our Password Generator shows the entropy as you adjust the length.
The simple rules that actually work
- Use 16+ characters for anything important.
- Make it random, not a word or phrase you invented.
- Never reuse a password across sites — one breach shouldn't unlock everything.
- Store them in a password manager so you don't have to remember each one.
Generate one safely right now
Open the free Password Generator. It uses your browser's cryptographic randomness, so the password is created on your device and never transmitted to anyone.