Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Password Strength Checker

Analyze password strength with entropy and crack time estimate.

FreeRuns in browserpassword strength checkerpassword tester

Strength Score

Entropy (bits)

Crack Time Estimate

Character Set Size

Suggestions

Input

0 chars

Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Password Strength Checker

Analyze password strength with entropy and crack time estimate. Check password strength online for free. See entropy bits, estimated crack time, character set analysis, and actionable improvement suggestions instantly. Delivers a comprehensive breakdown of your content with real-time metrics updated as you type. Supports Unicode text including multi-byte characters, emoji, and mixed-language content. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

How to Use Password Strength Checker

Paste or type your content into the input field.
The tool analyzes it and displays metrics instantly.
Review the detailed breakdown of your content.

Frequently Asked Questions

What is Password Strength Checker?

Check password strength online for free. See entropy bits, estimated crack time, character set analysis, and actionable improvement suggestions instantly.

How are words and sentences counted?

Words are counted by splitting on whitespace boundaries, following the same rules used by most word processors. Sentences are detected by punctuation marks (periods, question marks, exclamation marks) followed by whitespace or end of text.

Does the analysis count Unicode characters?

Yes, the tool counts Unicode characters correctly, treating each grapheme cluster (including emoji and combined characters) as a single character. This gives you an accurate count regardless of the language or script used.

What metrics are included?

The analysis provides a comprehensive set of metrics such as character count, word count, sentence count, paragraph count, and reading time estimates. Specific tools may include additional domain-relevant metrics.

Is Password Strength Checker free to use?

Yes, all analysis features are free with no restrictions. The tool runs locally in your browser and needs no account.

Is my data safe when using Password Strength Checker?

Yes, all analysis is performed locally in your browser. Your content is never uploaded or transmitted to any external server.

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