90+ Free Online Tools
Everything you need
Calculators, converters, text tools, cheatsheets, fitness, nutrition — all in one place. No signup, runs in your browser, nothing uploaded.
Open Percentage CalculatorCalculators
Percentage CalculatorCalculate what is X% of Y instantly. Free online percentage calculator.
Percentage IncreaseCalculate the percentage increase between two numbers easily.
Percentage DecreaseCalculate the percentage decrease between two numbers instantly.
Percentage ChangeFind the percent change between two numbers — increase or decrease.
X is What % of YFind what percentage one number is of another.
Tip CalculatorCalculate the right tip amount and split the bill with friends.
Discount CalculatorCalculate sale prices and savings with percentage discounts.
Profit Margin CalculatorCalculate profit margin, cost, revenue and markup instantly.
Markup CalculatorCalculate markup percentage from cost and selling price.
Sales Tax CalculatorCalculate sales tax on any purchase amount quickly.
VAT CalculatorAdd or remove VAT from any amount. Supports custom VAT rates.
Text Tools
Word CounterCount words, characters, sentences and paragraphs in your text.
Character CounterCount characters with and without spaces. Track Twitter/SMS limits.
Case ConverterConvert text between UPPER, lower, Title, camelCase, snake_case and more.
Lorem Ipsum GeneratorGenerate placeholder text — paragraphs, sentences, or words.
Text DiffCompare two texts side by side and see the differences highlighted.
Remove DuplicatesRemove duplicate lines from your text instantly.
Sort LinesSort lines alphabetically, numerically, or reverse order.
Find & ReplaceFind and replace text with regex support. Preview all matches.
Slug GeneratorGenerate URL-friendly slugs from any text.
Fancy Text GeneratorConvert text to fancy Unicode styles — bold, italic, script, and more.
Invisible CharacterCopy invisible Unicode characters — zero-width spaces and more.
Text to BinaryConvert text to binary code and vice versa.
Binary to TextConvert binary code back to readable text.
Date & Time
Age CalculatorCalculate your exact age in years, months, and days from your birthday.
Days Between DatesCalculate the number of days, weeks, and months between two dates.
Date CalculatorAdd or subtract days, weeks, months or years from any date.
Countdown TimerCreate a live countdown to any date — birthdays, events, deadlines.
Weeks CalculatorCalculate the number of weeks between two dates.
Timestamp ConverterConvert Unix timestamps to human-readable dates and back.
Timezone ConverterConvert times between different timezones worldwide.
Utilities
Screen ResolutionCheck your screen resolution, viewport size, pixel ratio, and display info instantly.
Keyboard TesterTest every key on your keyboard. See key codes, names, and visual layout highlighting.
Online StopwatchFree online stopwatch with lap times and millisecond precision.
Online TimerSet a countdown timer with alarm sound. Quick presets for common durations.
Online NotepadFree online notepad with auto-save. Write notes that persist in your browser.
Color PickerPick any color and convert between HEX, RGB, and HSL. Copy with one click.
Meta Tag GeneratorGenerate HTML meta tags for SEO, Open Graph, and Twitter Cards. Copy with one click.
Box Shadow GeneratorGenerate CSS box-shadow with live preview. Multiple shadows, color, blur, and spread controls.
QR & Codes
Unit Converters
Kg to LbsConvert kilograms to pounds instantly.
Lbs to KgConvert pounds to kilograms instantly.
Celsius to FahrenheitConvert Celsius to Fahrenheit instantly.
Fahrenheit to CelsiusConvert Fahrenheit to Celsius instantly.
CM to InchesConvert centimeters to inches instantly.
Inches to CMConvert inches to centimeters instantly.
KM to MilesConvert kilometers to miles instantly.
Miles to KMConvert miles to kilometers instantly.
Cups to mLConvert US cups to milliliters instantly.
Oz to GramsConvert ounces to grams instantly.
Bytes ConverterConvert between B, KB, MB, GB, TB, and PB.
Speed ConverterConvert between km/h, mph, m/s, and knots instantly.
Random
Random NumberGenerate random numbers with custom range and options.
Coin FlipFlip a virtual coin with 3D animation.
Dice RollerRoll 1-6 dice with visual dot faces and sum display.
Team PickerRandomly split names into color-coded teams.
What to EatCan't decide what to eat? Spin a wheel of food options to pick lunch, dinner, or takeout.
Cheatsheets
Git CheatsheetComplete git cheatsheet with 65+ commands.
Linux CheatsheetEssential Linux command cheatsheet with 75+ commands.
CMD vs PowerShellWindows CMD and PowerShell commands side by side.
Python CheatsheetPython cheatsheet with 75+ snippets.
JavaScript CheatsheetJavaScript cheatsheet with 75+ snippets.
TypeScript CheatsheetTypeScript cheatsheet with 55+ type patterns.
SQL CheatsheetSQL cheatsheet with 60+ queries.
HTML CheatsheetHTML cheatsheet with 65+ tags.
CSS CheatsheetCSS cheatsheet with 70+ properties.
Rust CheatsheetRust cheatsheet with 60+ snippets.
Go Cheatsheet — 60+ Snippets · Goroutines, Channels, SlicesGo cheatsheet with 60+ snippets.
Dart Cheatsheet — 55+ Snippets · Null Safety, Async, ClassesDart cheatsheet with 55+ snippets covering null safety, async, classes and collections.
Kotlin CheatsheetKotlin cheatsheet with 55+ snippets. Null safety, data classes, coroutines, and extensions.
Flutter CheatsheetFlutter cheatsheet with 50+ widgets and patterns. Layout, state, navigation.
React CheatsheetReact cheatsheet with 40+ patterns. Components, hooks, forms, context, routing.
Docker CheatsheetDocker cheatsheet with 60+ commands. Images, containers, Dockerfile, Compose, networks.
Regex CheatsheetRegex cheatsheet with 55+ patterns. Quantifiers, groups, lookaround, and real-world examples.
Tailwind CSS CheatsheetTailwind CSS cheatsheet with 60+ utility classes covering layout, spacing, colors, responsive.
Bash Scripting CheatsheetBash scripting cheatsheet with 60+ snippets. Variables, loops, conditions, arrays, functions.
Markdown CheatsheetMarkdown cheatsheet with 40+ syntax entries. Headings, lists, links, tables, code blocks.
Vim CheatsheetVim cheatsheet with 65+ commands. Modes, movement, editing, search/replace, splits.
Fitness
BMI CalculatorCalculate your Body Mass Index from weight and height.
TDEE CalculatorCalculate Total Daily Energy Expenditure with Mifflin-St Jeor.
Body Fat CalculatorEstimate body fat percentage using the US Navy method.
Ideal WeightCalculate ideal weight using 4 medical formulas.
One Rep MaxEstimate your 1RM from weight and reps.
Water IntakeCalculate recommended daily water intake.
Nutrition
Calorie CalculatorCalculate daily calories for your weight goal.
Macro CalculatorCalculate protein, carbs, and fat from daily calories.
Protein CalculatorCalculate daily protein needs for your goal.
Calorie DeficitCalculate calorie deficit for weight loss.
Cooking ConverterConvert between cups, tablespoons, ml, grams, and more.
90+ free tools and growing
No signup, no limits. Everything runs locally in your browser.
By Marco B. ·