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Hearing Test Tool Convert hearing level in dB to sound pressure in µPa and estimate perceived loudness in sones. life Vision Test Tool Convert visual acuity values between decimal, Snellen fraction, and LogMAR scales for eye exams. life Study Timer Create a study session timer with customizable duration and subject. life Grade Calculator Calculate your percentage and letter grade from a score. life GPA Calculator Enter your course grades and credits to compute your GPA. life Daily Water Intake Calculator Determine your daily water needs based on weight, activity level, and climate. life Body Fat Percentage Calculator Estimate body fat percentage using the U.S. Navy method based on gender, age, and body measurements. life Menstrual Cycle Tracker Calculate next period, ovulation, and fertile window based on cycle length and last start date. life Profit Margin Calculator This profit margin calculator helps you determine the profit, profit margin percentage, and markup percentage based on your cost and revenue figures. life Retirement Calculator This retirement calculator projects the total savings you will have at retirement, considering your current age, retirement age, existing savings, monthly contributions, and expected annual return. life Debt Repayment Calculator This debt repayment calculator helps you estimate your monthly loan payments, total repayment amount, and total interest based on principal, annual interest rate, and loan term. life ROI Calculator This calculator determines your return on investment (ROI) and annualized ROI based on initial investment, final value, and investment period. life Family Budget Planner This planner helps you allocate your monthly income across various expense categories and see how much you can save. life Income Tax Calculator This calculator estimates your personal income tax using progressive tax brackets. Enter your annual income and standard deduction to get the taxable amount, tax payable, and net income. life Asset Depreciation Calculator Compute annual and monthly depreciation using the straight-line method. life Savings Goal Calculator Determine how much to save monthly to reach your savings goal, with optional interest. life AA Bill Splitter Calculate how much each person should pay when splitting a bill equally. life Global Timezone Converter Convert a time from one timezone to another, supporting major global timezones. text Cross-Timezone Meeting Coordinator Input a time and your timezone to see the corresponding time in another timezone, helping coordinate meetings globally. text Perpetual Calendar (Lunar Calendar) Enter a Gregorian date to see the corresponding lunar calendar date and traditional festivals. text Stock Return Calculator Calculate your stock returns based on buy/sell prices and dividend yield. life Food Calorie Lookup Look up calorie content for common foods per 100g. life Tea Brewing Timer Set your tea type and get recommended steeping time and water temperature. life HTTP Client A simple HTTP client to send GET, POST, PUT, DELETE requests and inspect responses. dev Online Chart Generator Create bar, line, or pie charts by entering your data and customizing the title. life Quick Notes A simple online tool to create, edit, and manage quick notes without any registration. life Multi-function Counter Analyze your text to get character count, word count, line count, and other useful statistics. life File Merger Paste multiple text blocks and merge them into a single output with a custom separator. life Work Hours Salary Calculator Enter your hourly rate and work schedule to instantly calculate daily, weekly, monthly, and annual salary. text Column Processor Process delimited text by extracting or removing specific columns. Useful for CSV or TSV data manipulation. text Text Encrypt/Decrypt Encrypt text to Base64 or decrypt Base64 back to plain text. Supports multiple encoding methods. text Text Template Filler Create a text template with placeholders like {{name}} and fill them with your own values to generate personalized text. text Rich Text to Plain Text Remove HTML tags and extract clean text content from rich text. text Placeholder Text Generator Create placeholder text for design mockups and content previews. text Number Formatter Format numbers with customizable decimal places and locale-specific grouping. text String Escape Escape special characters (quotes, backslashes, etc.) in a string for use in JavaScript or JSON. text Slugify Tool Transform any text into a clean, lowercase, hyphen-separated slug suitable for URLs. text Double Pinyin Practice Generate double pinyin practice prompts based on your input and selected scheme. text Whitespace Cleaner This tool cleans up whitespace in your text by removing extra spaces, tabs, and empty lines, making it neat and consistent. text Text Randomizer This tool randomly shuffles the lines or characters of your input text, useful for creating random samples or mixing content. text Text Frequency Analysis This tool analyzes the frequency of words and characters in your input text, helping you understand the distribution of terms. text URL Sanitizer Remove unsafe characters, normalize encoding, and make URLs safe for use. dev Security Header Checker Analyze HTTP response headers to identify missing or weak security configurations. dev CSP Policy Generator Create a customized CSP policy for your website to prevent XSS and data injection attacks. dev CORS Config Generator Generate CORS configuration headers for your web server or API. dev Text Encryption/Decryption Encrypt and decrypt text using various algorithms with a secret key. dev Image Steganography Tool Embed secret messages into images using steganography techniques. dev Chinese Simplified to Traditional Conversion Convert Chinese text from simplified to traditional characters. text