Are Karvics tools really free?

Yes, all Karvics tools are completely free to use with no registration required. There are no hidden fees, premium features, or trial limitations. Every Karvics tool is 100% free forever.

Do Karvics tools work offline?

Yes, most Karvics tools work entirely in your browser without sending data to any server. Once the page loads, you can disconnect from the internet and continue using Karvics tools.

Is my data safe with Karvics?

Absolutely! Karvics prioritizes your privacy. Most tools process data entirely in your browser, and we never store or transmit your sensitive information to our servers. Your files never leave your device.

What tools does Karvics offer?

Karvics offers 30+ tools: Base64 encoder/decoder, AES encryption, hash generators (MD5, SHA256), QR code generator, PDF editor, SEO tools, URL analyzer, TOON converters, and many more developer utilities.

Do I need to create an account for Karvics?

No account required! All Karvics tools are available immediately without any registration or sign-up process. No email, password, or personal information needed.

Can I use Karvics tools for commercial projects?

Yes! You can use all Karvics tools for both personal and commercial projects without any restrictions or fees.

How is password entropy calculated?

Entropy is calculated using the formula: E = L × log₂(R), where L is password length and R is the size of the character set (26 for lowercase, 52 for mixed case, etc.). We also reduce entropy for common patterns and dictionary words.

What is a good entropy score?

For most accounts, aim for 60+ bits (Good). Financial accounts should have 80+ bits (Strong). Master passwords and critical accounts need 100+ bits (Very Strong).

Are the crack time estimates accurate?

Our estimates are based on current attack capabilities and assume the attacker knows your password character composition. Real-world crack times vary based on attack methods, hashing algorithms, and whether the password is in rainbow tables.

Why check for personal information?

Passwords containing personal information (name, birthdate, username) are easier for attackers to guess through social engineering. Our tool detects these patterns and warns you, helping you create truly random passwords.

Is it safe to type my password here?

Yes, the analysis happens entirely in your browser. Your password is never sent over the internet.

Password Entropy & Time-to-crack Estimator

100% Private Analysis✓ Client-Side Only

All analysis happens in your browser. Your password never leaves your device.

How to Use

Enter any password to analyze its strength instantly
View entropy (randomness) measured in bits
Check estimated crack time under different attack scenarios
Enable personal data check to detect risky patterns
Compare multiple passwords side-by-side
View your analysis history (stored locally)

Enter Password

Type or paste your password

Attack Scenario

Choose realistic attack scenario for time estimates

Check for Personal Information

Enter a password above to analyze its strength

Understanding Entropy

Entropy measures password randomness in bits. Higher entropy = harder to crack.

• <40 bits: Weak - crackable in hours/days

• 40-60 bits: Fair - crackable in weeks/months

• 60-80 bits: Good - crackable in years

• 80-120 bits: Strong - crackable in centuries

• 120+ bits: Very Strong - practically uncrackable

Password Entropy Calculator & Strength Analyzer

What is Password Entropy?

Password entropy is a measurement of how unpredictable and random a password is. It's measured in bits, where each additional bit doubles the number of possible combinations an attacker must try. Our calculator analyzes your password's character composition and length to determine its entropy and estimate crack time.

Why Check Password Strength?

With modern computing power, weak passwords can be cracked in seconds. Our tool helps you understand whether your password is strong enough for different use cases, from social media to banking. We check against common passwords, detect personal information, and provide actionable suggestions.

How We Calculate Strength

Character Set Size: More character types = higher entropy
Password Length: Each character multiplies combinations
Common Patterns: Sequential or repeating chars reduce strength
Breach Database: Check against known compromised passwords
Personal Info: Detect username, birthdate, etc.

Unique Features

Compare multiple passwords side-by-side
Personal data detection to avoid risky patterns
Local history tracking (never sent to servers)
Real-world attack scenario estimates
Category-specific safety recommendations

Entropy & Security Glossary

Password Entropy: The measurement of password unpredictability in bits. Calculated as log₂(possible combinations). Each additional bit doubles crack difficulty.
Crack Time: Estimated time for an attacker to guess your password using brute force methods at a specific guessing rate (attempts per second).
Common Password: Passwords found in breach databases or frequently used lists. These are vulnerable regardless of complexity due to dictionary attacks.
Personal Information: Data like usernames, birth years, or names that can be discovered through social engineering, making passwords predictable.
Attack Scenario: The computing power and method used by attackers, ranging from online rate-limited (100K/sec) to AI-powered attacks (1T/sec).
Character Composition: The distribution of lowercase, uppercase, numbers, and symbols in your password. Diverse composition increases entropy.

Frequently Asked Questions about Password Entropy & Time-to-crack Estimator

Entropy is a measure of the unpredictability or randomness of a password. Higher entropy means the password is harder to guess or crack.

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