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.
Calculators
Percentage Calculator Calculate what is X% of Y instantly. Free online percentage calculator.
Percentage Increase Calculate the percentage increase between two numbers easily.
Percentage Decrease Calculate the percentage decrease between two numbers instantly.
Percentage Change Find the percent change between two numbers — increase or decrease.
X is What % of Y Find what percentage one number is of another.
Tip Calculator Calculate the right tip amount and split the bill with friends.
Discount Calculator Calculate sale prices and savings with percentage discounts.
Profit Margin Calculator Calculate profit margin, cost, revenue and markup instantly.
Markup Calculator Calculate markup percentage from cost and selling price.
Sales Tax Calculator Calculate sales tax on any purchase amount quickly.
VAT Calculator Add or remove VAT from any amount. Supports custom VAT rates.
Text Tools
Word Counter Count words, characters, sentences and paragraphs in your text.
Character Counter Count characters with and without spaces. Track Twitter/SMS limits.
Case Converter Convert text between UPPER, lower, Title, camelCase, snake_case and more.
Lorem Ipsum Generator Generate placeholder text — paragraphs, sentences, or words.
Text Diff Compare two texts side by side and see the differences highlighted.
Remove Duplicates Remove duplicate lines from your text instantly.
Sort Lines Sort lines alphabetically, numerically, or reverse order.
Find & Replace Find and replace text with regex support. Preview all matches.
Slug Generator Generate URL-friendly slugs from any text.
Fancy Text Generator Convert text to fancy Unicode styles — bold, italic, script, and more.
Invisible Character Copy invisible Unicode characters — zero-width spaces and more.
Text to Binary Convert text to binary code and vice versa.
Binary to Text Convert binary code back to readable text.
Date & Time
Age Calculator Calculate your exact age in years, months, and days from your birthday.
Days Between Dates Calculate the number of days, weeks, and months between two dates.
Date Calculator Add or subtract days, weeks, months or years from any date.
Countdown Timer Create a live countdown to any date — birthdays, events, deadlines.
Weeks Calculator Calculate the number of weeks between two dates.
Timestamp Converter Convert Unix timestamps to human-readable dates and back.
Timezone Converter Convert times between different timezones worldwide.
Utilities
Screen Resolution Check your screen resolution, viewport size, pixel ratio, and display info instantly.
Keyboard Tester Test every key on your keyboard. See key codes, names, and visual layout highlighting.
Online Stopwatch Free online stopwatch with lap times and millisecond precision.
Online Timer Set a countdown timer with alarm sound. Quick presets for common durations.
Online Notepad Free online notepad with auto-save. Write notes that persist in your browser.
Color Picker Pick any color and convert between HEX, RGB, and HSL. Copy with one click.
Meta Tag Generator Generate HTML meta tags for SEO, Open Graph, and Twitter Cards. Copy with one click.
Box Shadow Generator Generate CSS box-shadow with live preview. Multiple shadows, color, blur, and spread controls.
QR & Codes
Unit Converters
Kg to Lbs Convert kilograms to pounds instantly.
Lbs to Kg Convert pounds to kilograms instantly.
Celsius to Fahrenheit Convert Celsius to Fahrenheit instantly.
Fahrenheit to Celsius Convert Fahrenheit to Celsius instantly.
CM to Inches Convert centimeters to inches instantly.
Inches to CM Convert inches to centimeters instantly.
KM to Miles Convert kilometers to miles instantly.
Miles to KM Convert miles to kilometers instantly.
Cups to mL Convert US cups to milliliters instantly.
Oz to Grams Convert ounces to grams instantly.
Bytes Converter Convert between B, KB, MB, GB, TB, and PB.
Speed Converter Convert between km/h, mph, m/s, and knots instantly.
Random
Random Number Generate random numbers with custom range and options.
Coin Flip Flip a virtual coin with 3D animation.
Dice Roller Roll 1-6 dice with visual dot faces and sum display.
Team Picker Randomly split names into color-coded teams.
What to Eat Can't decide what to eat? Spin a wheel of food options to pick lunch, dinner, or takeout.
Cheatsheets
Git Cheatsheet Complete git cheatsheet with 65+ commands.
Linux Cheatsheet Essential Linux command cheatsheet with 75+ commands.
CMD vs PowerShell Windows CMD and PowerShell commands side by side.
Python Cheatsheet Python cheatsheet with 75+ snippets.
JavaScript Cheatsheet JavaScript cheatsheet with 75+ snippets.
TypeScript Cheatsheet TypeScript cheatsheet with 55+ type patterns.
SQL Cheatsheet SQL cheatsheet with 60+ queries.
HTML Cheatsheet HTML cheatsheet with 65+ tags.
CSS Cheatsheet CSS cheatsheet with 70+ properties.
Rust Cheatsheet Rust cheatsheet with 60+ snippets.
Go Cheatsheet — 60+ Snippets · Goroutines, Channels, Slices Go cheatsheet with 60+ snippets.
Dart Cheatsheet — 55+ Snippets · Null Safety, Async, Classes Dart cheatsheet with 55+ snippets covering null safety, async, classes and collections.
Kotlin Cheatsheet Kotlin cheatsheet with 55+ snippets. Null safety, data classes, coroutines, and extensions.
Flutter Cheatsheet Flutter cheatsheet with 50+ widgets and patterns. Layout, state, navigation.
React Cheatsheet React cheatsheet with 40+ patterns. Components, hooks, forms, context, routing.
Docker Cheatsheet Docker cheatsheet with 60+ commands. Images, containers, Dockerfile, Compose, networks.
Regex Cheatsheet Regex cheatsheet with 55+ patterns. Quantifiers, groups, lookaround, and real-world examples.
Tailwind CSS Cheatsheet Tailwind CSS cheatsheet with 60+ utility classes covering layout, spacing, colors, responsive.
Bash Scripting Cheatsheet Bash scripting cheatsheet with 60+ snippets. Variables, loops, conditions, arrays, functions.
Markdown Cheatsheet Markdown cheatsheet with 40+ syntax entries. Headings, lists, links, tables, code blocks.
Vim Cheatsheet Vim cheatsheet with 65+ commands. Modes, movement, editing, search/replace, splits.
Fitness
BMI Calculator Calculate your Body Mass Index from weight and height.
TDEE Calculator Calculate Total Daily Energy Expenditure with Mifflin-St Jeor.
Body Fat Calculator Estimate body fat percentage using the US Navy method.
Ideal Weight Calculate ideal weight using 4 medical formulas.
One Rep Max Estimate your 1RM from weight and reps.
Water Intake Calculate recommended daily water intake.
Nutrition
Calorie Calculator Calculate daily calories for your weight goal.
Macro Calculator Calculate protein, carbs, and fat from daily calories.
Protein Calculator Calculate daily protein needs for your goal.
Calorie Deficit Calculate calorie deficit for weight loss.
Cooking Converter Convert 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. ·