Password Strength Checker
Estimate how strong a password is — checked locally
Length
Time to crack
Weaknesses found
⚠
Private by design: your password is analysed entirely in your browser — it is never sent to or stored on any server. Crack-time assumes a fast offline attack (~10 billion guesses/sec).
Password Strength Checker — Complete Guide & Instructions
MakeCard Password Strength Checker tells you how hard your password would be to crack — analysed entirely on your device. As you type, it computes an entropy score in bits, estimates the time a fast offline attack (~10 billion guesses/second) would take, and flags specific weaknesses like common-password usage, repeated patterns, sequences (abcd, 1234), and embedded years. A five-level verdict bar gives the answer at a glance, from Very weak to Excellent.
How to Use Password Strength Checker
- 1 Type a password into the Password field (tap “Show” to reveal it).
- 2 Watch the strength bar and verdict label update live — from Very weak to Excellent.
- 3 Check the entropy figure in bits and the estimated time to crack.
- 4 Read the “Weaknesses found” list for exactly what is dragging the score down.
- 5 Adjust the password until it reaches Strong or Excellent.
Key Features & Capabilities
- Entropy measured in bits based on the character pools used.
- Estimated crack time assuming a fast offline attack (~10 billion guesses/sec).
- Penalty detection: common passwords, repeated characters/patterns, sequences, and years.
- Five-level verdict — Very weak, Weak, Fair, Strong, Excellent.
- Live analysis as you type; Show/Hide toggle for the password.
- Completely local — the password never leaves your browser.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Metric | Entropy (bits) + 5-level strength verdict |
| Attack Model | ~10 billion guesses/sec offline attack |
| Penalties Checked | Common passwords · repeats · sequences · embedded years |
| Output | Verdict, entropy bits, crack-time estimate, weakness list |
| Analysis | Runs 100% in-browser as you type |
Practical Everyday Use Cases
- Testing a new password before using it on an important account.
- Checking whether an old password is still safe to keep.
- Comparing two candidate passwords for a banking or email account.
- Learning which patterns (names, years, repeats) weaken a password.
- Demonstrating password hygiene in a security-awareness session.
Pro Tips for Best Results
- Length beats complexity — a 16+ character passphrase outperforms a short symbol-heavy password.
- Avoid years, names and sequences; the checker penalizes exactly the patterns attackers try first.
- Aim for Strong or Excellent; Fair passwords can still fall to modern cracking rigs.
- Never test your real current password on random websites — this one is local, but the habit matters.
Common Problems & Solutions
Check the weaknesses list — one common word or year can cut entropy drastically even in a long password.
The password is very weak — add length, mix character types, and remove dictionary words.
It was — analysis is local-only. You can even disconnect from the internet and the checker still works.
Privacy & Security
100% Client-Side Execution
Your password is analysed entirely in your browser — it is never transmitted, logged, or stored on any server.
Frequently Asked Questions
Everything you need to know about using Password Strength Checker
Yes — everything is computed on your device. The password never leaves your browser, unlike server-based checkers.
It measures how unpredictable the password is — roughly log2 of the search space. Higher bits mean exponentially more guesses needed to crack it.
From the entropy — assuming a fast offline attack of about 10 billion guesses per second, the estimate ranges from “instantly” to “centuries”.
Length (16+ characters), mixed character types, and no dictionary words, names, years, or repeated/sequential patterns.
If it contains a common password, a year, or a sequence like 1234, the checker applies a penalty — those are the first things attackers try.
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100% free, browser-based, and private. No installation, registration, or file upload to external servers required.
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