Опубліковано: 2026-04-19
How to Create a Strong Password: The 2026 Guide
Entropy, character sets, and the one rule most guides skip. Learn exactly how to create a strong password — and check yours instantly. No fluff.
The Short Answer
A strong password is at least 16 characters, uses all four character types (uppercase, lowercase, numbers, symbols), and was generated by a cryptographically secure tool — not by you.
That's it. The rest is detail.
Why "Strong" Is a Math Problem, Not a Feeling
People are terrible at randomness. Ask someone to pick a "random" number between 1 and 10 — 37% say 7. Ask them to invent a "random" password and you'll get Sunshine2024!, which has been in every cracking dictionary since 2021.
Password strength isn't a vibe. It's bits of entropy — the mathematical unpredictability of a value.
Entropy (bits) = length × log₂(charset size)
Here's what that looks like in practice:
| Configuration | Charset Size | 12 chars | 16 chars | 20 chars |
|---|---|---|---|---|
| Lowercase only | 26 | 56 bits | 75 bits | 94 bits |
| Lower + Upper | 52 | 68 bits | 91 bits | 114 bits |
| Lower + Upper + Digits | 62 | 71 bits | 95 bits | 119 bits |
| All four types (+ symbols) | 94 | 79 bits | 105 bits | 131 bits |
The threshold: 80 bits is the practical floor for sensitive accounts. 100+ bits for anything you actually care about (email, banking, password manager master).
A 12-character all-types password barely clears the bar. A 16-character one gives you real headroom. Default to 16+.
The Four Rules That Actually Matter
Rule 1: Length Wins — Every Time
Every extra character doesn't add combinations. It multiplies them. Going from 12 to 16 characters on a 94-char charset increases the search space by a factor of roughly 78 million.
That's not a metaphor. It's basic exponentiation.
Length targets by account type:
- Low-stakes (forums, newsletter signups): 12 characters minimum
- Standard (social media, shopping, streaming): 16 characters
- Critical (email, banking, password manager master): 20+ characters
Rule 2: Use All Four Character Types
- Uppercase (A–Z) → +26 to charset
- Lowercase (a–z) → +26 to charset
- Numbers (0–9) → +10 to charset
- Symbols (!@#$%^&*...) → +32 to charset
All four together = 94-character charset. Skipping symbols drops you to 62. That's a meaningful entropy reduction for every single character in the password. Don't leave those bits on the table.
Rule 3: No Patterns, No Personal Info
Modern crackers don't just brute-force. They run dictionary attacks with rule sets: common substitutions (a→@, e→3), appended years, keyboard walks, name + date combinations. Your birthday + your dog's name + ! isn't creative — it's entry #4,732 in their rulebook.
What to avoid:
- Dictionary words in any language (including
p@ssw0rd— it's in every list) - Names, dates, addresses, and pet names
- Keyboard sequences:
qwerty,123456,zxcvbn - Repeated patterns:
aaaaaa,abcabc - Classic structures:
Word + Number + Symbol→Summer2026!
If you need a simple numeric code that is still unpredictable, use our PIN Generator instead of your birth year.
Rule 4: One Account, One Password — No Exceptions
Credential stuffing — using leaked credentials from one breach to attack other services — is now automated and runs at scale. The 2024 RockYou2024 compilation contained 10 billion leaked passwords.
If you reuse passwords, one breach means every account is compromised. It's not a risk calculation. It's a certainty with a delayed timestamp.
How to Actually Generate a Strong Password
Don't create passwords manually. Your brain is a pattern-matching machine that will betray you every single time.
Use a tool that runs cryptographically secure randomness. The Password Generator uses the browser's crypto.getRandomValues() API — the same standard used by operating systems and security software worldwide. Unlike tools built on Math.random(), the Web Crypto API draws entropy directly from your OS kernel. Nothing leaves your browser. No server, no logging, no network request.
To generate one right now:
- Open the Password Generator
- Set length to 16+ characters
- Enable all four character types
- Click Generate
- Copy it immediately into your password manager
Already have an existing password you want to evaluate? Run it through the Password Strength Checker — it calculates actual entropy in bits and gives you a real crack-time estimate. Not a colored bar with no numbers behind it.
What a Cracking Attack Actually Looks Like
Modern GPU clusters are not something to dismiss. A consumer-grade rig can test:
- MD5 hashes: ~100 billion guesses per second
- bcrypt (cost 10): ~20,000 guesses per second
The hash algorithm matters — but that's controlled by the service, not you. What you control is entropy. Here's the math on MD5 (worst case for you):
| Password | Entropy | Crack Time at 100B/sec |
|---|---|---|
| 8 chars, all types | ~52 bits | ~52 days |
| 12 chars, all types | ~79 bits | ~190,000 years |
| 16 chars, all types | ~105 bits | ~2.5 × 10²³ years |
At 16 characters you've effectively exited the crackable universe. The math is that brutal.
Common Mistakes Smart People Make
Complexity doesn't compensate for length. P@ss! is weaker than correcthorsebatterystaple. Length wins. Always.
Rotating suffixes on a base password. MyPassword-Google, MyPassword-GitHub — attackers know this pattern. If one credential leaks, all the variations are trivially guessable.
Trusting site "strength meters" blindly. Many mark Password1! as strong because it checks their rules. It's not strong — it's in every dictionary. Use actual entropy calculations.
Avoiding password managers because "single point of failure." Yes, a password manager is a single point of failure. But so is your brain — and your brain is a worse one. A properly audited manager with zero-knowledge encryption is orders of magnitude more secure than human memory.
The Strong Password Checklist
Before saving any credential, run through this:
- 16+ characters (20+ for critical accounts)
- All four character types included
- Generated by a cryptographically secure tool — not typed by hand
- Unique — not used on any other account, ever
- Saved immediately in a password manager
- Contains zero personal information
Generate yours now with the Password Generator. Then verify it actually holds up with the Password Strength Checker. Two minutes. Done.
Frequently Asked Questions
How long should a strong password be?
For most accounts, 16 characters is the modern standard. For critical accounts like your primary email or banking, 20+ characters is recommended to ensure resistance against offline brute-force attacks even in the worst-case scenario (MD5 storage).
Why is length better than complexity?
Password strength scales linearly with complexity but exponentially with length. Adding one character multiplies the difficulty of cracking by the size of the character set — 94× for a full ASCII charset. Going from 12 to 16 characters on a 94-char set increases the search space by roughly 78 million times.
Should I create passwords manually or use a generator?
Always use a cryptographically secure generator. Human-invented passwords follow predictable patterns that modern dictionary attacks exploit in milliseconds. A generator using crypto.getRandomValues() (Web Crypto API) produces true randomness your brain cannot replicate — and attackers cannot predict.