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  • Zip password strength tester

    Calculate entropy and crack time — zero-upload, completely private

    ZIP Password Strength Tester

    Real-time entropy calculation, GPU crack time estimates, and breach checking
    100% Private Engine
    0 characters
    Security Score: Enter Password
    Score Rating 0 / 100 Very Weak
    Information Entropy 0 Bits Search Space: 0
    Offline GPU Attack Instant 100 Billion/sec
    Online Throttled Instant 1,000 guesses/sec
    Data Breach Checking (k-Anonymity HIBP)
    Checks if this password appears in known public leak databases without exposing your raw password.
    Security Feedback & Suggestions
    Type a password above to generate security recommendations and pattern diagnostics.
    zxcvbn Realistic Strength Estimation

    zxcvbn Realistic Strength Estimation

    Uses Dropbox's industry-standard zxcvbn pattern recognition engine to detect dictionary words, keyboard walks, repeated sequences, and dates.

    Entropy & GPU Crack Time Metrics

    Entropy & GPU Crack Time Metrics

    Calculates password entropy in bits and estimates crack times for online attacks (1k guesses/sec) and offline high-speed GPU clusters (100 Billion guesses/sec).

    k-Anonymity Breach Checking

    k-Anonymity Breach Checking

    Optionally verify if your password has been exposed in public data breaches using Have I Been Pwned k-Anonymity (sending only 5 hex chars of SHA-1 hash).

    100% Private Client-Side Calculation

    100% Private Client-Side Calculation

    All pattern evaluation and entropy math execute locally inside your browser. Your typed password is never stored or transmitted.

    Our USPs

    Security 100% (No files are sent to server for processing)
    File size limits None (No limit on size of files)
    Usage limits None (Process as many files as you want)
    Price Free
    User Information Captured None (We do not request for user information such as email / phone number)
    Ads None (We provide complete ad free experience)

    Over 100k Users Trust SafeZipKit for File Compression & Security

    Join a growing community of users who rely on SafeZipKit.com for secure file compression, encryption, and efficient data management.

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