Is my password sent to a server?

No. The tool scores your password locally in your browser with JavaScript. Nothing you type is transmitted or stored.

What does entropy mean here?

Entropy measures how many random choices an attacker must test. It grows with length and with the number of character types you use. A longer password from a small set can beat a short password with symbols.

Why is a common password marked weak even with symbols?

The tool checks your input against a list of known leaked passwords. Attackers try those first, so a common base word with a number at the end cracks fast no matter how it looks.

How accurate are the crack time estimates?

They are rough estimates based on attacker hardware assumptions, not promises. Treat them as a comparison tool: pick the candidate with the largest margin.

Password Strength Checker

Score passwords in real time with entropy, character-class analysis, and actionable improvement tips. 100% client-side — nothing is sent anywhere.

Password Analysis

Enter a password

—waiting

Entropy

0 bits

Fast hash

—

~10¹⁰ guesses/s

Slow hash

—

~10⁴ guesses/s

Requirements

At least 8 characters

At least 12 characters

At least 16 characters

Has uppercase letter

Has lowercase letter

Has digit

Has symbol

Not in top common passwords

Improvement Tips

→Add more characters — aim for at least 12, ideally 16+.
→Mix uppercase, lowercase, digits, and symbols.
→Start typing to see strength analysis.

Password Security Field Guide

Get the checklist we use to harden authentication — entropy targets, hashing algorithms, and breach-response playbooks.

No spam. Unsubscribe anytime.

What problem does this solve?

You cannot tell if a password is weak just by looking at it. Sites accept short or common passwords that crack in minutes.

Built for: Anyone creating a new account password first, plus developers who want to see how entropy and crack-time estimates work.

Worked example

Type a candidate password such as Summer2024! into the input field.
Read the score label and the estimated crack time for fast and slow attackers.
Check the requirement list to see which rules the password fails.
Lengthen the password and add a symbol to watch the crack time jump from minutes to centuries.

Common questions

Is my password sent to a server?: No. The tool scores your password locally in your browser with JavaScript. Nothing you type is transmitted or stored.
What does entropy mean here?: Entropy measures how many random choices an attacker must test. It grows with length and with the number of character types you use. A longer password from a small set can beat a short password with symbols.
Why is a common password marked weak even with symbols?: The tool checks your input against a list of known leaked passwords. Attackers try those first, so a common base word with a number at the end cracks fast no matter how it looks.
How accurate are the crack time estimates?: They are rough estimates based on attacker hardware assumptions, not promises. Treat them as a comparison tool: pick the candidate with the largest margin.

Explore Related Tools

Discover more utility-driven tools designed to enhance your workflow and technical excellence.

Regex Tester & Explainer

Test JavaScript regular expressions with live match highlighting, capture groups, and a plain-English breakdown of every token.

Developer Utilities

Cron Expression Builder

Build and decode cron schedules visually. Get the next 5 run times, a human-readable description, and copy-ready syntax.

Developer Utilities

JSON Formatter & Validator

Beautify, minify, sort keys, and validate JSON instantly. Side-by-side diff mode for comparing two payloads.

Developer Utilities