Vercel
passwordslab.vercel.app
Password Strength Checker & Security Tester | Entropy Calculator & Crack Time Estimator
Analyze password strength with our security tool. Get real-time crack-time estimates, entropy scores, and risk evaluations. 100% secure, client-side processing. Improve protection with our password vulnerability tester.
Google Play
play.google.com › store › apps › details
Password Entropy Calculator - Apps on Google Play
Calculate your password's entropy in seconds.
Videos
Password Entropy - Create Strong Passwords!
05:22
Password Entropy explained - YouTube
05:03
Calculating Your Password's Strength - YouTube
11:19
What is password entropy and why it really, really, matters - YouTube
10:04
Password Entropy Calculations - YouTube
Password Strength Checker in Python
How much entropy does my password have?
To find out how much entropy a password contains, follow these steps:
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Determine the length of your password — how many characters there are.
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Calculate the size of the pool of symbols from which you've taken the characters. For instance, if you only use lowercase letters, the pool size is 26. If you additionally use some digits, the pool size is already 36.
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Compute the entropy as password its length times the log of the pool size to base 2.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
How many bits of entropy for a good password?
For non-vital accounts, 25-30 bits of entropy are enough. For more important accounts, aim for 60-80 bits of entropy, up to 100 for crucial ones.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
When is a password secure?
A password is secure if it has at least 50 bits of entropy and does not appear in any list of leaked passwords.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
Omni Calculator
omnicalculator.com › other › password-entropy
Password Entropy Calculator
March 20, 2024 - This password entropy calculator can compute how strong your password is.
Bitwarden
bitwarden.com › password-strength
Password Tester | Test Your Password Strength | Bitwarden
Bitwarden uses the zxcvbn tool for reliable password strength calculations.
Alecmccutcheon
alecmccutcheon.github.io › Password-Entropy-Calculator
Password Entropy Calculator
Password Strength Tester : Calculates the entropy of a password
Antivirus
antivirus.promo › password-strength-checker
Password strength checker. Test your password
Use this password strength checker to test your password. It shows real-time feedback and tips to create strong passwords. We calculate password complexity, entropy, brute force time, and check in blacklists.
PasswordMonster
passwordmonster.com › home
Password Strength Meter
March 3, 2022 - How strong are your passwords? Test how secure they are using the My1Login Password Strength Test.
Dev Lateral
devlateral.com › home › tools › password entropy calculator
Password Entropy Calculator Tool | Dev Lateral
Find out how strong your passwords are with our free to use password entropy calculator. Strong entropy bits means more secure passwords.
Okta
okta.com › identity-101 › password-entropy
Password Entropy: The Value of Unpredictable Passwords | Okta
By learning more about what password entropy is and how to measure it, you’ll discover how to keep critical information safe from hackers.
CatsWhoCode
catswhocode.com › password strength tester: check your password security
Password Strength Tester: Check Your Password Security
January 21, 2025 - The CatsWhoCode Password Strength Tester is a web application that evaluates password security using advanced cryptographic algorithms and real-time analysis. The tool processes passwords locally within the browser, calculating entropy bits, analyzing character diversity, and identifying potential ...
Nickmccurdy
nickmccurdy.com › password-entropy
Password Entropy
You need to enable JavaScript to run this app
Zelvin Security
zelvin.com › home › password entropy calculator
Password Entropy Calculator
March 14, 2025 - In general, the more characters a password has and the more diverse the set of characters it includes, the higher its entropy will be.
Reddit
reddit.com › r/cybersecurity › using entropy as a measure of password strength
r/cybersecurity on Reddit: Using entropy as a measure of password strength
August 6, 2025 -
I am currently helping in reviewing the company's password policy and looking at the shopping list of mandatory characteristics for building strong passwords, I got to thinking:
Why is it a standard practice to do qualitative rating of passwords based on it having a whole bunch of different criteria met instead of using a more quantitative rating based on it's entropy?
I get that one is easier for the user to achieve than the other, but a password manager can easily calculate the entropy of the passwords it stores (though few actually do so).
I have even seen recommendations for using mnemonics to remember passwords where the mnemonic would make for a stronger password than the actual password that it serves to remember. But since it doesn't have funky characters it doesn't pass muster.
Top answer 1 of 4
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Because you cannot accurately measure entropy based on a single password. A proper estimate of entropy is based on examining the app that generated the password. Since the workflow is limited to inspecting the drain bamaged suggestions that users are suggesting for a password, we are left in a difficult position. These “entropy calculators” that examine a single password are snake oil, but too many users try to use their sad little brains instead of a PRNG and a reputable password/passphrase app.
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I'm in the identity space and this is a pretty common library to use: https://github.com/dropbox/zxcvbn Instead of a policy like LUDS (lowercase, uppercase, decimal, symbol), using a library like zxcvbn and enforcing a strong password is a far better choice.
Passwordentropycalculator
passwordentropycalculator.com
Free Online Password Entropy Calculator | Test Your Password Strength
Free online password entropy calculator. Analyze password strength, get real-time security feedback, and learn best practices for digital security.
Timcutting
timcutting.co.uk › tools › password-entropy
Password Entropy Calculator by Tim Cutting
Tim Cutting is a frontend web developer and UI designer. Based in Colchester, UK, he primarily works in JS, React, Wordpress.
PlanetScale
planetscale.com › blog › using-entropy-for-user-friendly-strong-passwords
Using entropy for user-friendly strong passwords — PlanetScale
Instead of showing a list of rules and validating against them, you can instead implement a password meter that measures the password’s entropy and provides feedback to the user as they type it in.
Rumkin
rumkin.com › tools › password › passchk.php
Strength Test
People wonder if their password is a good password. I often come across two distinct groups of people. The first would fall into a "just use any word" category, which is a very bad practice for picking passwords. The second group will mix in a few numbers in order to make the password a lot ...
GitHub
github.com › AlecMcCutcheon › Password-Entropy-Calculator
GitHub - AlecMcCutcheon/Password-Entropy-Calculator: Calculates the entropy of a password
Calculates the entropy of a password. Contribute to AlecMcCutcheon/Password-Entropy-Calculator development by creating an account on GitHub.
Author AlecMcCutcheon
Online Hash Crack
onlinehashcrack.com › guides › password-recovery › password-entropy-calculator-measure-strength.php
Password Entropy Calculator: Measure Strength
October 1, 2025 - Use our entropy calculator to measure password strength, estimate crack time and pick safer passphrases without guesswork.
NordVPN
nordvpn.com › blog › what-is-password-entropy
Password entropy and how to calculate it | NordVPN
September 2, 2025 - Password entropy is the measurement for your password strength. Learn all about why password entropy is important and how to make your passwords stronger.