Free Online Tools for
Everyone

Developer

JSON Formatter

Instantly format and validate any JSON string. Paste raw or minified JSON and get a beautifully indented, readable output. Errors are detected and displayed clearly.

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JSON Minifier

Strip all whitespace from JSON to create compact, minified output. Ideal for reducing payload size in APIs, configuration files, and production builds.

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Base64 Encoder

Convert text or data to and from Base64 encoding instantly. Automatically detects whether to encode or decode based on your input.

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URL Encoder

Safely encode URLs for HTTP requests or decode percent-encoded strings back to readable text. Handles all special characters per RFC 3986.

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JWT Decoder

Paste any JWT token and instantly decode its header and payload sections. Inspect claims, expiry times, and issuer information without needing the secret key.

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Unix Timestamp

Convert Unix epoch timestamps to readable dates or convert any date/time to a Unix timestamp. Supports seconds and milliseconds, with UTC and local time display.

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UUID Generator

Generate universally unique identifiers (UUIDs) instantly. Choose between UUID v1 (time-based) and UUID v4 (random). Generate up to 20 UUIDs at once and validate existing ones.

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Hash Generator

Generate cryptographic hashes from any text input. Supports MD5, SHA-1, SHA-256, and SHA-512 algorithms. All processing happens server-side using native Node.js crypto.

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CSV → JSON

Paste any CSV data and convert it to a JSON array instantly. The first row is used as object keys. Supports comma, semicolon, and tab delimiters.

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JSON → CSV

Convert a JSON array of objects to a CSV file instantly. All keys become column headers. Supports flat and shallow-nested JSON structures.

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XML → JSON

Parse any XML document and convert it to a structured JSON object instantly. Handles attributes, nested elements, arrays, and namespaces.

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JSON → XML

Convert any JSON object or array to a well-formed XML document instantly. Handles nested objects, arrays, and primitive values.

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HTML Entity

Encode special HTML characters to their entity equivalents (& → &) or decode HTML entities back to plain text. Essential for safe HTML templating and debugging.

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Regex Tester

Test JavaScript regular expressions against any string. See all matches, capture groups, and indices highlighted in real time. Supports all standard regex flags.

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Color Converter

Convert any colour between HEX, RGB, HSL, and CMYK formats instantly. Enter a hex code, pick from the colour wheel, or type RGB values to get all formats at once.

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Text Diff

Paste two blocks of text or code and instantly see every addition, deletion, and unchanged line highlighted. Great for comparing config files, code reviews, or document revisions.

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Visitor Info Checker

Instantly view your connection and device information including IP address, device type, operating system, browser, language, and timezone. Perfect for testing and diagnostics.

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Binary to Decimal

Convert binary (base-2) numbers to decimal (base-10) format. Also see hexadecimal and octal equivalents.

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Decimal to Binary

Convert decimal (base-10) numbers to binary (base-2) format. Also see hexadecimal and octal equivalents.

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Hex to Decimal

Convert hexadecimal (base-16) numbers to decimal (base-10) format. Also see binary and octal equivalents.

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SQL Formatter

Instantly format and beautify SQL queries. Supports MySQL, PostgreSQL, SQLite, T-SQL, BigQuery, MariaDB, and standard SQL. Choose indentation, keyword case, and dialect.

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CSS Minifier

Minify CSS to reduce file size and improve page load speed, or beautify compressed CSS for readability. Supports Level 1 and Level 2 optimization using clean-css.

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Markdown → HTML

Convert Markdown text to clean HTML instantly. Supports GitHub Flavored Markdown (GFM) including tables, code blocks, strikethrough, and task lists. Preview and copy rendered HTML.

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QR Code Generator

Create QR codes instantly for any URL, text, phone number, or message. Choose your preferred size and error correction level, then download the PNG. No sign-up required.

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YAML Formatter

Format and validate YAML instantly. Detect syntax errors, convert YAML to JSON or JSON to YAML, and beautify configuration files for Kubernetes, Docker Compose, GitHub Actions, and more.

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JavaScript Minifier

Minify and compress JavaScript code using Terser — the industry-standard JS minifier. Remove whitespace, shorten variable names, and compress code to reduce bundle size and improve page load speed.

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SMTP Tester

Verify your SMTP mail server configuration by sending a real test email. Enter your server host, port, credentials, and a recipient address to instantly confirm everything is working.

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Cron Parser

Enter a 5-field cron expression to get a plain-English explanation and per-field breakdown.

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SVG to PNG

Paste your SVG markup to convert it to a PNG image. Optionally set custom width and height.

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HTML Minifier

Paste your HTML to remove comments, collapse whitespace, and shrink page size. See exact byte savings.

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GraphQL Formatter

Paste your GraphQL query or mutation to get a cleanly formatted, indented output.

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Regex Helper

Enter a regex pattern and optional test string to see matches and a token-by-token explanation of what your regex does.

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Calculator

Percentage Calculator

Calculate any percentage instantly. Find what is X% of Y, calculate percentage increase or decrease, or determine what percentage one number is of another.

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Discount Calculator

Calculate the final price after discount and see how much you save. Enter the original price and discount percentage to instantly see your savings.

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Tip Calculator

Calculate tips and split bills effortlessly. Enter your bill amount, choose a tip percentage, and see the total with tip plus how much each person should pay.

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BMI Calculator

Calculate your Body Mass Index (BMI) to assess if you're at a healthy weight. Enter your height and weight in metric or imperial units to see your BMI and category.

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Loan Calculator

Calculate your loan payments and see how much interest you'll pay over the life of the loan. Enter loan amount, interest rate, and term to get instant results with an amortization breakdown.

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Mortgage Calculator

Calculate your monthly mortgage payment including principal, interest, property taxes, and insurance (PITI). See how different rates and terms affect your payment.

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Compound Interest Calculator

Calculate the future value of your investment or savings with compound interest. Enter principal, interest rate, time, and compounding frequency to see your money grow.

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Profit Margin Calculator

Calculate profit margins, markup percentages, and revenue instantly. Enter cost and selling price to see detailed profit calculations for your business.

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Probability Calculator

Calculate the probability of an event, odds in favor, odds against, and complement probability. Enter favorable and total outcomes to get instant results.

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Sales Tax Calculator

Calculate tax amount and final total from any subtotal and tax rate. Useful for checkout estimates and invoices.

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VAT Calculator

Quickly add VAT to net amounts or extract VAT from gross prices with accurate calculations.

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Commission Calculator

Calculate commission earnings from sales and combine with base pay to estimate total compensation.

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Break-even Calculator

Calculate how many units you must sell to cover all costs and identify break-even revenue.

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Savings Goal Calculator

Estimate months and years needed to reach your savings target with regular contributions and optional investment growth.

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Retirement Calculator

Project your retirement balance from current age to retirement age using monthly savings and expected annual return.

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ROI Calculator

Calculate the return on investment (ROI) for any investment. Enter your initial cost, final value, and optional time period to see your net profit, ROI percentage, and annualized return.

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Net Worth Calculator

Find out your net worth by listing your assets and liabilities. Your net worth equals total assets minus total liabilities — a key indicator of your financial health.

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DTI Calculator

Calculate your debt-to-income ratio to determine your loan eligibility. Lenders use DTI to evaluate mortgage and loan applications — a DTI under 43% is required for most loans.

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Payroll Tax Calculator

Estimate your US federal income tax, Social Security, Medicare, and net take-home pay. Supports single and married filing status, pre-tax deductions, and state income tax.

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Rental Property Calculator

Analyze a rental property investment in seconds. Enter purchase price, financing, and rental income to see monthly cash flow, cap rate, cash-on-cash return, and total ROI.

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Depreciation Calculator

Calculate asset depreciation using straight-line, double declining balance (DDB), or sum-of-years-digits (SYD) methods. Get a full annual depreciation schedule instantly.

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Stock Profit Calculator

Calculate the profit or loss on any stock trade. Enter buy price, sell price, and number of shares to see net profit, ROI, and estimated after-tax returns including brokerage fees.

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Credit Card Payoff

Find out exactly when you'll be debt-free and how much interest you'll pay. Enter your balance, APR, and monthly payment to see your payoff date and total cost — plus how much you save by paying more than the minimum.

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Rent vs Buy

Make the biggest financial decision of your life with confidence. This calculator compares the total net cost of buying vs renting over your planned stay, accounting for mortgage, equity, appreciation, property taxes, and the opportunity cost of your down payment.

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Auto Loan Calculator

Calculate your exact monthly car payment and the true cost of your auto loan. Factor in down payment, trade-in value, sales tax, interest rate, and loan term to see total interest and full amortization.

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Calorie Calculator

Calculate how many calories you need per day based on your height, weight, age, gender, and activity level. Get your BMR and TDEE, plus calorie targets for weight loss, maintenance, and muscle gain.

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Body Fat Calculator

Estimate your body fat percentage using the accurate US Navy circumference method. Enter your neck, waist, and hip measurements to calculate body fat %, fat mass, lean mass, and your fitness category.

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Crypto Profit Calculator

Calculate your exact profit or loss on any cryptocurrency trade. Enter entry price, exit price, and quantity to see net profit, ROI, total cost basis, and after-tax returns.

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Inflation Calculator

Find out what any dollar amount from history is worth in today's money — or vice versa. Uses US Bureau of Labor Statistics CPI data from 1913 through 2024.

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Finance

Life Insurance Calculator

Find out exactly how much life insurance coverage you need using the DIME method. Enter your income, debts, mortgage, and education costs to get a recommended coverage amount.

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Student Loan Calculator

Calculate your monthly student loan payment, total interest cost, and payoff timeline. See how making extra payments reduces interest and shortens your repayment period.

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401k Calculator

Project how much your 401k will be worth at retirement. Enter your current age, salary, contribution percentage, employer match, and expected return to see your projected balance.

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Take-Home Pay Calculator

Estimate your US take-home pay after federal income tax, Social Security, Medicare, and state taxes. See your effective tax rate and net paycheck for any pay period.

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Roth IRA Calculator

Project your Roth IRA balance at retirement based on your contributions, current balance, and expected return. Includes 2024 income eligibility and contribution limit checks.

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Home Equity Calculator

Find out how much equity you have in your home and how much you may be able to borrow. Calculates your LTV ratio and maximum HELOC or home equity loan amount.

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Mortgage Refinance Calculator

Determine if refinancing your mortgage is worth it. Calculate your new monthly payment, monthly savings, break-even point, and total lifetime interest savings.

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Debt Payoff Calculator

Enter up to 3 debts and see exactly when you'll be debt-free using the Debt Avalanche (highest-rate first) or Debt Snowball (lowest-balance first) strategy. See total interest saved and payoff order.

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Personal Loan Calculator

Calculate your monthly payment, total interest paid, and total loan cost for any personal loan. Adjust the loan amount, rate, and term to find the best fit for your budget.

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Home Affordability Calculator

Find out the maximum home price you can afford based on your annual income, monthly debts, and down payment. Uses front-end and back-end DTI limits to estimate your budget.

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Tax Bracket Calculator

See exactly how much federal income tax you owe in 2024, broken down by each bracket. Calculates your marginal rate, effective rate, and after-tax income using 2024 standard deductions.

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FIRE Calculator

Calculate your FIRE number — the savings target for financial independence — plus how many years until you can retire early based on your savings rate, expenses, and expected investment return.

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Social Security Calculator

Estimate your Social Security monthly benefit at any claiming age from 62 to 70. Enter your FRA benefit from your SSA statement to see how early or delayed claiming affects your lifetime payout.

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CD Rate Calculator

Calculate how much interest you'll earn on a Certificate of Deposit (CD). Enter your deposit amount, interest rate, and term to see your maturity value and APY.

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Net Salary Calculator

Enter your gross salary and applicable deduction rates to instantly calculate your net take-home pay.

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Salary Increase Calculator

Enter your current salary and raise percentage to see your new pay, the increase amount, and a multi-year projection.

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Pension Calculator

Project your pension pot at retirement by entering your salary, employee and employer contribution rates, and expected growth.

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COLA Calculator

Calculate how a COLA raise affects your nominal salary and real purchasing power compared to inflation.

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Invoice Generator

Create a professional invoice by filling in your details, line items, tax, and discount. Preview and print or download instantly.

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Text

Word Counter

Count words, characters, sentences, and paragraphs in your text. Get detailed statistics including reading time and keyword density.

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Character Counter

Count total characters, characters without spaces, and get detailed text statistics for your content.

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Text Case Converter

Convert text between different cases instantly. Supports uppercase, lowercase, title case, sentence case, and more.

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Title Case Converter

Convert text to Title Case where every word starts with a capital letter. Perfect for headings and titles.

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Random Text Generator

Generate random text for testing, design mockups, and placeholder content. Customizable length and format.

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Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text for your design projects. Choose paragraphs, words, or sentences.

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Keyword Density Checker

Analyze keyword density and frequency in your text. Perfect for SEO content optimization and analysis.

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Text to Slug

Convert text to URL-friendly slugs. Remove special characters, convert spaces to hyphens for SEO-optimized URLs.

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Remove Line Breaks

Remove line breaks and newlines from text. Convert multi-line text to a single continuous line.

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Text Diff Checker

Compare two texts and see the differences highlighted. Perfect for finding changes between document versions.

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Random String Generator

Generate random strings with customizable length and character types (letters, numbers, symbols).

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Password Generator

Generate strong, secure passwords with customizable length and character types. Ensure your accounts stay safe.

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Password Strength Checker

Check your password strength and get security recommendations. Test password entropy and vulnerability.

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Health

Due Date Calculator

Calculate your estimated due date based on your last menstrual period (LMP) using Naegele's rule. Get trimester start dates, your current week of pregnancy, and days until your due date.

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Macros Calculator

Calculate your ideal daily macronutrient targets — protein, fat, and carbohydrates — based on your weight, height, age, activity level, and whether you want to cut, maintain, or bulk.

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Ideal Body Weight Calculator

Calculate your ideal body weight using four widely-used medical formulas — Devine, Hamwi, Robinson, and Miller. Results are given in both kg and lbs for your height and gender.

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Ovulation Calculator

Calculate your estimated ovulation date and 6-day fertile window based on your last period and cycle length. Includes predictions for the next 3 cycles.

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Sleep Calculator

Find the best times to wake up or go to bed based on natural 90-minute sleep cycles. Waking at the end of a cycle helps you feel refreshed instead of groggy.

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One Rep Max Calculator

Estimate your one-rep maximum (1RM) by entering a weight you can lift for multiple reps. Uses 6 formulas (Epley, Brzycki, Lombardi, Mayhew, O'Connor, Wathan) plus a training percentage table.

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TDEE Calculator

Calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor formula with goals and macro estimates.

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Water Intake Calculator

Find out how much water you should drink per day based on your body weight, activity level, and local climate.

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Pregnancy Calculator

Enter your last menstrual period (LMP) or conception date to calculate your due date, current gestational age, trimester, and key milestones.

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Vaccine Schedule

Enter a date of birth to see the recommended vaccination schedule with upcoming, due, and overdue statuses.

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Allergy Calculator

Estimate your hereditary allergy risk and discover cross-reactive foods for common allergens. For educational use only.

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