Free tools that just work
Every tool below runs entirely in your browser — no accounts, no uploads, no tracking. Pick a category to get started.
🕐 Time & Dates
Age Calculator
Free age calculator. Enter your date of birth to see your exact age in years, months and days, your total days lived, and a countdown to your next birthday.
Countdown Timer
Free countdown timer. Enter any future date and see exactly how many days, hours, minutes and seconds remain. Works in your browser, no signup needed.
Countdown Timer
Free countdown timer. Set hours, minutes and seconds and count down with a clear display and alarm when complete.
Day of the Week
Free day of week calculator. Find out what day of the week any date falls on. Check birthdays, historical dates, or any future date instantly.
Days Between Dates
Free days between dates calculator. Find exactly how many days, weeks, and months are between any two dates. Works instantly in your browser.
Date & Time Duration Calculator
Free duration calculator. Select two dates and times to instantly see the exact duration in years, months, days, hours, minutes and seconds.
Stopwatch with Laps
Free online stopwatch with lap timer. Start, stop, and record lap times. Shows the fastest and slowest laps highlighted.
Leap Year Calculator
Free leap year calculator. Check if any year is a leap year and find the next leap year. Instant results in your browser.
Pomodoro Timer
Free Pomodoro timer. 25-minute focus sessions with 5-minute short breaks and 15-minute long breaks. No signup needed. Runs in your browser with sound alerts.
Stopwatch
Free online stopwatch with millisecond precision. Start, pause, record lap times, and reset. No download needed. Works entirely in your browser.
Time Calculator
Free time calculator. Add or subtract hours, minutes, and seconds easily. Great for calculating total work hours, travel times, and durations.
Time Zone Converter
Free time zone converter. Convert any date and time between 40+ world cities and timezones instantly. Shows current time in all cities.
Time Zone Difference Calculator
Free time zone difference calculator. Find the exact hour difference between any two cities or time zones worldwide. Instant results in your browser.
Unix Timestamp Converter
Free Unix timestamp converter. Convert Unix epoch time to a human-readable date and time, or convert any date back to a Unix timestamp. Works instantly in your browser.
Week Number
Free week number calculator. Find the ISO week number for any date. See what week of the year it is today or for any date you choose.
Work Days Calculator
Free work days calculator. Count the number of business days (Monday–Friday) between any two dates, excluding weekends. Instant results in your browser.
World Clock
Free world clock. Compare the current local time in multiple cities simultaneously. No signup required. Updates every second in your browser.
🔢 Math
Algebra Equation Solver
Free algebra solver. Solve linear equations (ax + b = c) and systems of two linear equations with two unknowns using substitution and Cramer's rule.
Area Calculator
Free area calculator. Calculate the area of rectangles, circles, triangles, squares, and trapezoids. Enter dimensions and get the area instantly in your browser.
Aspect Ratio Calculator
Free aspect ratio calculator. Enter width and height to get the simplified ratio (e.g. 1920×1080 = 16:9) and scale to any new size instantly.
Average Calculator
Free average calculator. Enter a list of numbers to compute the arithmetic mean, geometric mean, harmonic mean, weighted average and more.
Online Basic Calculator
Free online calculator. Perform addition, subtraction, multiplication, and division. A clean, simple, full-featured basic calculator that works entirely in your browser.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Free online base converter with instant results.
Combination & Permutation Calculator
Free combination and permutation calculator. Compute C(n,r) and P(n,r) for any n and r up to 30. Shows both formulas.
Decimal to Fraction Converter
Free decimal to fraction converter. Enter any decimal number and get the exact simplified fraction form instantly.
Exponent Calculator
Free exponent calculator. Compute base^exponent for any real numbers. Handles negative exponents, fractional powers and large results.
Factorial Calculator
Free factorial calculator. Compute n! for any integer from 0 to 170. Shows the exact result, scientific notation and number of digits.
Fibonacci Sequence Generator
Free Fibonacci generator. Enter how many terms you want and instantly see the Fibonacci sequence. Supports up to 80 terms of exact values.
Fraction Calculator
Free fraction calculator. Add, subtract, multiply or divide any two fractions and get the simplified result instantly. Also shows the decimal equivalent.
Fraction to Decimal Converter
Free fraction to decimal converter. Enter numerator and denominator to get the decimal form, and see whether it terminates or repeats.
GCD Calculator
Free GCD calculator. Find the Greatest Common Divisor (GCD/GCF/HCF) of any set of numbers. Also shows the LCM. Instant results in your browser.
LCM Calculator
Free LCM calculator. Find the Least Common Multiple (LCM) of any set of numbers. Also shows the GCD. Instant results in your browser.
Logarithm Calculator
Free logarithm calculator. Compute common log (base 10), natural log (ln), binary log (base 2), or any custom base logarithm.
Matrix Calculator
Free matrix calculator. Add, subtract, multiply matrices, compute determinants and transposes instantly in your browser.
Number Base Converter
Free number base converter. Convert any number between binary, octal, decimal, hexadecimal, or any base from 2 to 36 instantly in your browser.
Octal Number Converter
Free octal converter tool. Instantly convert any number between base 2 (binary), base 8 (octal), base 10 (decimal), and base 16 (hex).
Percentage Calculator
Free percentage calculator. Find a percent of a number, work out what percent one value is of another, and calculate percentage increase or decrease instantly.
Percentage Change Calculator
Free percentage change calculator. Find the percentage increase or decrease between two values instantly. Shows exact change and direction.
Prime Number Checker
Free prime number checker. Enter any positive integer to instantly find out if it is prime. Also shows all divisors and the prime factorization.
Prime Factorization Calculator
Free prime factorization calculator. Enter any positive integer up to 999,999,999 and instantly see its prime factorization with exponents.
Pythagorean Theorem Calculator
Free Pythagorean theorem calculator. Enter any two sides of a right triangle to find the third. Works for hypotenuse or either leg. Instant and accurate.
Quadratic Equation Solver
Free quadratic equation solver. Enter a, b and c coefficients to find the roots of ax² + bx + c = 0 using the quadratic formula.
Ratio Simplifier
Free ratio simplifier. Enter any two numbers to reduce the ratio to its simplest form, find the scale factor, and see equivalent ratios.
Roman Numeral Converter
Free Roman numeral converter. Convert any decimal number 1–3999 to Roman numerals, or convert Roman numerals back to decimal.
Roman Numeral Converter
Free Roman numeral converter. Convert any number from 1 to 3999 to Roman numerals, or convert Roman numerals back to decimal. Instant and accurate.
Rounding Calculator
Free rounding calculator. Round any number to a chosen number of decimal places, or round up or down, instantly and precisely in your browser.
Scientific Calculator
Free scientific calculator. Evaluate mathematical expressions including trigonometry, logarithms, powers and more directly in your browser.
Square Root Calculator
Free square root calculator. Find the square root of any positive number instantly. Also shows the square (n²). Works in your browser with no signup required.
Statistics Calculator
Free statistics calculator. Enter a list of numbers to instantly compute mean, median, mode, standard deviation, variance, min, max and range.
Statistics Visualizer
Free statistics visualizer. Enter a list of numbers to calculate mean, median, mode, variance, standard deviation and see a simple frequency distribution.
Trigonometry Calculator
Free trigonometry calculator. Compute sin, cos, tan, cot, sec, csc for any angle in degrees or radians.
Unit Converter
Free unit converter. Convert between meters and feet, kilograms and pounds, Celsius and Fahrenheit, liters and gallons, and many more units instantly in your browser.
💰 Finance
Break-Even Calculator
Free break-even calculator. Enter fixed costs, selling price and variable costs per unit to find your break-even point in units and revenue.
50/30/20 Budget Rule Calculator
Free 50/30/20 budget rule calculator. Enter your monthly income to instantly see how much to allocate to needs, wants, and savings.
Coin and Note Counter
Count US coins and banknotes and calculate the total value.
Compound Interest Calculator
Free compound interest calculator. Enter a principal, interest rate, and time period to see how compound interest grows your investment. Monthly, quarterly, or annual compounding.
Currency Converter
Free currency converter with live daily exchange rates for 40 currencies. Convert instantly in your browser — no signup, no tracking.
Discount Calculator
Free discount calculator. Enter the original price and the discount percentage to instantly see the final sale price and exactly how much you save.
Emergency Fund Calculator
Free emergency fund calculator. Enter your monthly expenses to find your target emergency fund size and how many months to reach it.
Loan EMI Calculator
Calculate monthly EMI, total interest and total payment for any loan.
Currency Exchange Calculator
Free currency exchange calculator. Enter a custom exchange rate and fee percentage to calculate the exact amount received after conversion.
Currency Exchange Calculator
Free currency converter with sample exchange rates. Convert between USD, EUR, GBP, JPY, BRL and more major currencies. Rates are approximate sample values.
Fuel Cost Calculator
Calculate fuel cost for any trip given distance, fuel efficiency and price.
Hours & Pay Calculator
Free hours and pay calculator. Enter hours worked, hourly rate and overtime hours to calculate weekly, monthly and annual gross pay.
Inflation Calculator
Free inflation calculator. Enter an amount and years to see how inflation affects purchasing power. Uses a custom annual inflation rate.
Investment Return Calculator
Free investment return calculator. Enter an initial amount, monthly contributions, annual return rate and years to see final value and total gain.
Loan Calculator
Free loan calculator. Enter the loan amount, interest rate, and term to see your monthly payment and total interest paid. Works for mortgages, car loans, and personal loans.
Mortgage Affordability Calculator
Free mortgage affordability calculator. Enter income, debt and down payment to find the maximum home price you can afford based on the 28/36 rule.
Net Worth Calculator
Free net worth calculator. Add your assets and liabilities to calculate your total net worth. Helps you understand your financial position.
Net Present Value (NPV) Calculator
Free NPV calculator. Enter cash flows and discount rate to calculate Net Present Value and Internal Rate of Return (IRR) for investment analysis.
Retirement Savings Calculator
Free retirement calculator. Estimate your retirement savings based on monthly contributions, expected return, and years to retirement.
Rule of 72 Calculator
Free Rule of 72 calculator. Enter your annual return rate to find how long until your investment doubles, or enter years to find the required rate.
Sales Tax Calculator
Free sales tax calculator. Enter a price and a tax rate to add tax to a net price or extract it from a gross price. Works for VAT, GST, and any percentage.
Savings Goal Calculator
Free savings goal calculator. Enter your savings target, current savings, monthly contribution and interest rate to see how long to reach your goal.
Stock Return Calculator
Free stock return calculator. Enter buy price, sell price and shares to calculate total profit, percentage return and annualized CAGR.
Tip Calculator
Free tip calculator. Enter the bill and tip percentage to see the tip amount and total, then split it evenly between any number of people. Instant and private.
Tipping Guide by Country
How much to tip in different countries and services.
Tip and Bill Split Calculator
Calculate tip amount and split the bill evenly between multiple people.
VAT Calculator
Free VAT calculator. Add VAT to a net price or remove VAT from a gross price. Supports any VAT rate. Shows net, VAT amount and gross.
🎲 Randomizers
Coin Flip
Free online coin flip. Tap to flip a fair virtual coin and get heads or tails instantly, with a running tally. Works in your browser, no app needed.
Random Letter Generator
Free random letter generator. Pick one or many random letters from A to Z, in uppercase, lowercase or mixed case, instantly and fairly in your browser.
Random Name Generator
Free random name generator. Generate random first and last names by gender and cultural origin. Perfect for writers, game developers, and baby name inspiration.
Random Number Generator
Free random number generator. Pick one or many random numbers between any minimum and maximum, with an option for unique results. Secure and instant in your browser.
Dice Roller
Free online dice roller. Roll d4, d6, d8, d10, d12, d20, and d100 dice, alone or in groups. Perfect for D&D, tabletop RPGs, and board games. No download needed.
Yes or No
Free Yes or No generator. Ask a question and get a fair, random yes or no answer instantly, with a running tally. Works in your browser, no app needed.
🎮 Games & Fun
Biorhythm Calculator
Calculate physical, emotional and intellectual biorhythm cycles from your birthdate.
Cat Age Calculator
Free cat age calculator. Convert your cat's age to human years using the AAHA-recognized formula. Cats age faster in their first two years.
Decision Maker
Free decision maker. Enter your options and let the randomizer pick one for you. Add pros/cons weighting for more realistic choices.
Dog Age Calculator
Free dog age calculator. Convert your dog's age to human years based on size. Uses updated scientific research, not the outdated 7× rule.
Emoji Text Translator
Type text and automatically add relevant emojis based on keywords.
ASL Finger Spelling
See the ASL (American Sign Language) finger spelling for any word or letter.
Hangman
Free hangman word game. Guess the hidden word one letter at a time before the hangman is complete. Classic word guessing game.
Love Compatibility Calculator
Fun love compatibility calculator based on names.
Lucky Number Generator
Generate a set of lucky lottery numbers.
Magic 8 Ball
Free online Magic 8 Ball. Think of a yes-or-no question, tap the ball, and receive one of the classic fortune-telling answers. Fun, instant and private.
Memory Card Game
Free memory card matching game. Flip cards to find matching emoji pairs. Tracks moves and time. Tests and improves visual memory.
Morse Code Trainer
Practice decoding Morse code. A letter is shown as dots and dashes.
Name Day Lookup
Find the traditional Catholic/European name day for any first name.
Number Guessing Game
Free number guessing game. Guess a secret number and receive hot/cold hints. Choose your difficulty range up to 1000.
Numerology Name Number
Calculate your numerology name number from your full name.
Random Fact Generator
Free random fact generator. Discover surprising and interesting facts across science, history, mathematics, nature and technology with each click.
Random Quote Generator
Free random quote generator. Get a new inspirational or motivational quote with every click. Hundreds of famous quotes from history's greatest thinkers.
Rhyme Finder
Find words that rhyme with any English word. Great for poetry and lyrics.
Rock Paper Scissors
Free online Rock Paper Scissors game. Play against the computer, see results instantly, and track your score. No download or signup needed.
Flag Semaphore Encoder
Encode text as flag semaphore arm positions.
This or That
Free This or That game. Make rapid preference choices between two options. Fun for parties and learning about yourself.
Tic-Tac-Toe
Free Tic-Tac-Toe game. Play against a friend or versus an unbeatable AI. Classic 3x3 noughts and crosses.
General Knowledge Trivia Quiz
Free trivia quiz. Answer 20 general knowledge questions covering science, history, geography, sports and pop culture. Instant scoring.
Wheel Spinner
Free online wheel spinner. Add options and spin to make a random decision. Great for choosing restaurants, games or making any choice.
Word Scramble Game
Free word scramble game. Unscramble jumbled letters to find the hidden English word. Get hints if you are stuck.
Would You Rather?
Free Would You Rather game. Tap a choice to see what others chose, then move to the next dilemma. Fun for parties and icebreakers.
Zodiac Sign Calculator
Free zodiac sign calculator. Enter your birthday to find your Western zodiac (sun sign) and Chinese zodiac sign with personality traits.
📝 Text & Words
List Alphabetizer
Free online list alphabetizer. Sort any list A-Z, Z-A, by last word, or remove duplicates instantly. Paste your list and click sort.
Anagram Solver
Free anagram solver. Enter letters to find all valid English words you can make. Great for Scrabble, Wordle and word games.
Backwards Text Generator
Free backwards text generator. Instantly reverse the letters, the word order or the line order of any text in your browser, then copy the result.
Binary Translator
Free binary translator. Convert any text to binary code and decode binary back to text, with full Unicode support, instantly and privately in your browser.
Case Converter
Free online case converter. Instantly change text to UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg case and small caps in your browser.
Character Counter
Free character counter. Count characters (with and without spaces), words, sentences, paragraphs, and lines in any text. Instant, no signup needed.
Emoji Picker
Free emoji picker. Search over 1,500 emojis by name, click any emoji to copy it to your clipboard. Works on all devices.
Lorem Ipsum Generator
Free Lorem Ipsum generator. Create placeholder dummy text by paragraphs, sentences or words for design mockups and layouts, then copy it in one click.
Morse Code Translator
Free Morse code translator. Convert any text to Morse code dots and dashes, or decode Morse code back to text. Includes audio playback. Works entirely in your browser.
Palindrome Checker
Free palindrome checker. Instantly test whether a word, phrase or number reads the same forwards and backwards, ignoring case, spaces and punctuation.
Reading Time Calculator
Free reading time calculator. Paste any text to instantly see the word count, estimated reading time, and estimated speaking time. No signup needed.
Sentence Counter
Free sentence counter. Paste any text to instantly count sentences, words, characters, paragraphs, and lines. Shows average words per sentence.
Syllable Counter
Free syllable counter. Count the number of syllables in any English word or text instantly. Useful for poetry, song lyrics, and haiku writing.
Text Diff Tool
Free text diff tool. Compare two texts and highlight the differences between them. Find added, removed, and changed words instantly.
Text Repeater
Free text repeater. Repeat a word, phrase or line as many times as you like, with a line break, space or comma between copies, then copy the result instantly.
Text Reverser
Free text reverser. Reverse characters in text, reverse word order, or reverse the order of lines. Three reversal modes in one tool.
Text Summarizer
Free text summarizer. Paste any text and extract the most important sentences automatically using extractive summarization.
Title Case Converter
Free title case converter. Convert text to title case, sentence case, capitalize first letter of each word, or alternating case instantly.
Upside Down Text Generator
Free upside down text generator. Flip any text into upside-down characters you can copy and paste into social media, bios and messages. Instant and private.
Word Counter
Free live word counter. Paste or type text to count words, characters, sentences, paragraphs and estimated reading time instantly in your browser.
Word Frequency Counter
Free word frequency counter. Paste any text and instantly see the most common words ranked by frequency. Option to exclude stop words.
📱 Social Media
QR Code Generator
Free QR code generator. Create a QR code for any URL, text, WiFi password, or contact information. Download as PNG. Works entirely in your browser.
TikTok Caption Analyzer
Free TikTok caption analyzer. See character count vs 2200 limit, hashtag count, word count, and estimated read time. Optimize your TikTok captions instantly.
Twitter / X Character Counter
Free Twitter/X character counter. Counts tweet length with URL normalisation (each URL = 23 chars). Color-coded limit indicator for the 280-character limit.
UTM Link Builder
Free UTM builder. Create UTM-tagged URLs for Google Analytics and other analytics platforms. Track traffic from email, social media, and paid campaigns.
❤️ Health & Body
Blood Type Compatibility Checker
Free blood type compatibility checker. Select your ABO/Rh blood type to instantly see who you can donate blood to and who you can receive blood from.
BMI Calculator
Free BMI calculator. Enter your height and weight in metric or imperial units to get your Body Mass Index and category instantly, in your browser.
BMR Calculator
Free BMR calculator. Calculate your Basal Metabolic Rate — the calories your body burns at rest per day. Uses the Mifflin-St Jeor equation.
Body Fat Percentage Calculator
Free body fat percentage calculator using the US Navy method. Enter height, neck, waist and hip (women) measurements to estimate body fat.
Body Fat Percentage Classifier
Find your body fat category: essential, athlete, fitness, average or obese.
Calorie Burn Calculator
Free calorie burn calculator. Select an activity, enter your weight and duration to estimate calories burned. Uses MET values for accuracy.
Food Calorie Calculator
Free calorie calculator. Look up approximate calories per 100g for common foods. Great for diet tracking and meal planning.
Pregnancy Due Date Calculator
Free pregnancy due date calculator. Enter your last menstrual period or conception date to estimate your due date and current week of pregnancy.
Food Calorie Reference
Calories per 100g for common foods with protein, carbs and fat.
Heart Rate Zone Calculator
Free heart rate zone calculator. Enter your age and resting heart rate to find your 5 training zones: fat burn, aerobic, anaerobic and VO2 max.
Daily Water Intake Calculator
Free water intake calculator. Enter your weight and activity level to find your recommended daily water intake in litres, cups and ounces.
Ideal Weight Calculator
Free ideal weight calculator. Find the healthy weight range for your height and sex using the BMI method and the Robinson, Miller, and Devine formulas.
Macronutrient Calculator
Free macro calculator. Enter your daily calorie target and diet goal to get protein, carb and fat targets in grams and calories.
Macro Ratio Calculator
Free macro ratio calculator. Enter your daily calorie target and diet goal to get optimal protein, carbohydrate and fat grams per day.
Ovulation Calculator
Free ovulation calculator. Enter your last period and cycle length to estimate your ovulation date, fertile window and next period date.
Running Pace Calculator
Free running pace calculator. Enter distance and time to calculate pace per km or mile, speed, and equivalent race finish times.
Pregnancy Week Calculator
Free pregnancy calculator. Enter your last menstrual period date to find your current pregnancy week, trimester and estimated due date.
Sleep Cycle Calculator
Free sleep calculator. Enter your wake time to find the ideal bedtimes based on 90-minute sleep cycles. Wake up refreshed instead of groggy.
Vitamin D Sun Exposure Calculator
Free vitamin D sun exposure calculator. Enter your skin type and sun intensity to find how many minutes of sun exposure you need to produce adequate vitamin D.
Daily Water Intake Calculator
Free water intake calculator. Find out exactly how much water you should drink each day based on your body weight and activity level. Instant results in your browser.
🏠 Home & Auto
Electricity Cost Calculator
Free electricity cost calculator. Enter an appliance wattage, hours of use per day, and your electricity rate to see daily, monthly, and annual running costs.
Paint Calculator
Free paint calculator. Enter your wall dimensions, number of coats, and paint coverage to calculate exactly how many litres of paint you need.
🔧 Utilities
Age in Different Units
Calculate your age in years, months, weeks, days, hours, minutes and seconds.
Caesar Cipher
Free Caesar cipher tool. Encode or decode text using the Caesar substitution cipher with any shift value from 1 to 25.
Character and Word Counter
Count characters, words, sentences, paragraphs and estimated reading time.
Color Format Converter
Free color format converter. Convert between HEX, RGB, HSL, HSV and CMYK color formats instantly. Paste any color code and see all equivalents.
Color Picker
Free color picker. Select any color and instantly get its HEX, RGB, and HSL codes. Copy with one click. Works entirely in your browser.
Date Add/Subtract Calculator
Add or subtract days, weeks, months or years from any date.
CSS Gradient Generator
Free CSS gradient generator. Create linear and radial gradients with any colors and instantly get the CSS code. No signup needed.
HTML Encoder / Decoder
Free HTML encoder and decoder. Convert special characters to HTML entities and back. Encode < > & " ' and more for safe display in web pages.
My IP Address & Info
Find your public IP address, approximate location, timezone and internet provider. Uses ipapi.co for lookup. No data stored.
NATO Phonetic Alphabet
Convert text to NATO phonetic alphabet (Alpha, Bravo, Charlie...).
Network Speed Calculator
Calculate how long it takes to transfer a file at a given network speed.
Number to Words Converter
Free number to words converter. Enter any integer and get it spelled out in English or Portuguese. Useful for checks, legal documents and language learning.
Passphrase Generator
Free passphrase generator. Create memorable but secure passphrases using random common words. Much easier to remember than random characters.
QR Code Reader
Free QR code reader. Upload an image containing a QR code to decode its content instantly in your browser. No app needed.
Random Color Generator
Free random color generator. Generate a random colour and see its HEX, RGB and HSL codes instantly. Great for design inspiration and picking palettes.
ROT13 Encoder / Decoder
Free ROT13 encoder and decoder. Convert text with the ROT13 substitution cipher in real time. ROT13 encodes and decodes with the same operation.
Screen Resolution Checker
Free screen resolution checker. Shows your screen resolution, viewport size, device pixel ratio, color depth, touch support and more.
Sunrise and Sunset Estimator
Calculate sunrise and sunset times for any location and date.
Text to Binary Converter
Free text to binary converter. Convert any text to binary (01010100...) and binary back to text. Uses 8-bit ASCII encoding.
Extended Unit Converter
Convert between speed, pressure, energy, power and data storage units.
URL Encoder / Decoder
Free URL encoder and decoder. Encode special characters in URLs with percent-encoding or decode percent-encoded URLs back to plain text.
🔄 Converters
Angle Unit Converter
Free angle converter. Convert between degrees, radians, gradians, arcminutes, arcseconds, turns and milliradians instantly.
Area Unit Converter
Free area converter. Convert between square metres, square feet, square miles, acres, hectares, square kilometres and more instantly.
Energy Unit Converter
Free energy converter. Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, foot-pounds and electron volts.
Frequency Unit Converter
Free frequency converter. Convert between hertz, kilohertz, megahertz, gigahertz and revolutions per minute (RPM). Shows period in seconds.
Pressure Unit Converter
Free pressure converter. Convert between pascal, bar, psi, atmosphere, mmHg, inHg and other pressure units instantly.
Data Storage Converter
Free data storage converter. Convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes and their binary counterparts.
Volume Unit Converter
Free volume converter. Convert between litres, millilitres, US gallons, fluid ounces, cups, pints, quarts, cubic metres and more.
💻 Developer Tools
Base64 Encoder / Decoder
Free Base64 encoder and decoder. Encode text to Base64 or decode Base64 strings back to plain text instantly in your browser.
Cron Expression Builder
Free cron expression builder. Build and describe cron schedule expressions.
CSS Minifier
Free CSS minifier. Remove whitespace, comments and unnecessary characters from CSS to reduce file size for faster page loads.
CSV to JSON Converter
Free CSV to JSON converter. Paste CSV data with headers to convert it to a JSON array of objects. Handles quoted values and various delimiters.
Diff Checker
Compare two texts and highlight differences line by line.
Hash Generator
Free hash generator. Calculate SHA-256, SHA-1, and MD5 hashes for any text input instantly in your browser. No data is sent anywhere.
HTML Beautifier
Free HTML beautifier. Paste messy or minified HTML and format it with proper indentation for better readability.
HTTP Status Code Reference
Complete list of HTTP response codes 1xx-5xx with descriptions.
JSON Formatter & Validator
Free JSON formatter and validator. Paste JSON to format it with proper indentation, minify it, or check it for errors. Works in your browser instantly.
JSON Minifier & Formatter
Free JSON minifier and formatter. Remove whitespace to compress JSON, or format minified JSON with proper indentation for readability.
JSON Path Tester
Free JSON path tester. Paste JSON and enter a dot-notation key path to extract values.
JSON to CSV Converter
Free JSON to CSV converter. Paste a JSON array of objects and convert it to a CSV file with proper headers and escaped values.
JWT Decoder
Free JWT decoder. Decode and inspect JSON Web Tokens.
Markdown to HTML Converter
Free Markdown to HTML converter. Paste Markdown and see the HTML output and live preview side by side. Supports headings, lists, links, images, code and bold/italic.
Markdown Preview
Free live markdown preview. Write markdown and see the rendered HTML preview in real time.
Regex Cheat Sheet
Quick reference for regular expression syntax.
Regular Expression Tester
Free regular expression tester. Enter a regex pattern and test string to see matches highlighted in real time. Supports all JavaScript regex flags.
URL Slug Generator
Free URL slug generator. Convert any title or text to a clean, URL-friendly slug by removing special characters and replacing spaces with hyphens.
Text Encoder and Decoder
Free text encoder. URL, HTML entity and Base64 encode/decode.
Unix File Permissions Calculator
Toggle chmod permissions and get the octal code and symbolic notation.
UUID Generator
Free UUID generator. Generate one or multiple random UUID v4 identifiers instantly in your browser. Click any UUID to copy it.
🎨 Design & CSS
Aspect Ratio Calculator
Free aspect ratio calculator. Enter width and height to find the simplified aspect ratio, and scale to any new dimension while maintaining the ratio.
Border Radius Generator
Free border radius generator. Control each corner individually with sliders, see a live preview, and copy the CSS border-radius value.
CSS Box Shadow Generator
Free CSS box shadow generator. Adjust offset, blur, spread and color to design shadows visually. Copy the CSS code.
Color Contrast Checker
Free WCAG contrast checker. Calculate contrast ratio and check WCAG 2.1 AA and AAA compliance.
CSS Gradient Generator
Free CSS gradient generator. Pick two colors, choose linear, radial or conic, adjust the angle, and copy the generated CSS.
Font Properties Preview
Preview any font family, size and weight combination.
Font Pair Preview
Free font pair preview. Select a heading font and body font from popular Google Fonts to see how they look together in a live preview.
Image Color Picker
Free image color picker. Upload an image and click to pick exact colors. Shows hex, RGB and HSL values.
Color Palette Generator
Free color palette generator. Enter a base color and generate complementary, triadic, analogous or monochromatic color palettes. Copy hex codes.
🔬 Science
Gravitational Force Calculator
Calculate gravitational force using Newton law F = Gm1m2/r squared.
Ideal Gas Law Calculator
Free ideal gas law calculator. Enter any 3 of pressure, volume, moles and temperature to solve for the unknown variable using PV = nRT.
Kinematic Equations Solver
Free kinematics solver. Enter any 3 of 5 variables (v₀, v, a, t, d) to solve the unknown kinematic variables using the equations of motion.
Light Year Calculator
Convert between light-years, parsecs, astronomical units, kilometres and miles.
Molar Mass Calculator
Free molar mass calculator. Enter a chemical formula like H2O or NaCl to calculate the molar mass (molecular weight) in g/mol.
Newton's Second Law Calculator (F = ma)
Free Newton's Second Law calculator. Solve for force (F), mass (m) or acceleration (a) using F = ma. Shows units and explanation.
Ohm's Law Calculator
Free Ohm's Law calculator. Enter any two of voltage (V), current (A) or resistance (Ω) to calculate the missing value and power.
Periodic Table Reference
Search all 118 elements by name, symbol or atomic number.
pH Calculator
Free pH calculator. Enter hydrogen ion concentration [H⁺] or hydroxide concentration [OH⁻] to calculate pH and classify the solution.
Resistor Color Code Calculator
Free resistor color code calculator. Select the color bands of a 4-band or 5-band resistor to decode its resistance value and tolerance.
Scientific Notation Converter
Convert between standard numbers and scientific notation.
Speed Converter
Free speed converter. Convert between metres per second, kilometres per hour, miles per hour, knots, and Mach number instantly.
Temperature Converter
Free temperature converter. Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine instantly. See all four scales at once.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Reaumur and Romer.
Wave Properties Calculator
Calculate frequency, wavelength and wave speed using v = f x wavelength.
✅ Productivity
Checklist Maker
Free online checklist maker. Create custom checklists, check off items as you complete them, and track your progress. Saves to local storage.
Flashcard Maker
Free flashcard maker. Create question-answer flashcard sets and study them in a click-to-flip card interface. Data saved locally.
Focus Mode Writing Tool
Free focus mode writer. Distraction-free writing environment with live word count, character count and word target progress tracking.
Habit Tracker
Free browser-based habit tracker. Add habits and mark them done each day. Tracks streaks and completion rates. Data saved locally.
Keyboard Shortcut Reference
Browse and search keyboard shortcuts for Windows, Mac, Excel, VS Code and Chrome.
Meeting Cost Calculator
Free meeting cost calculator. Enter attendees, average salary and duration to calculate the real cost of any meeting in salary dollars.
Online Notepad
Free online notepad. Create, save and manage multiple notes in your browser. Auto-saves as you type. No account needed.
Pomodoro Timer Pro
Free Pomodoro timer with session history. Customizable focus and break durations. Tracks completed sessions and total focus time.
Reading Speed Test
Free reading speed test. Read a passage and see your reading speed in words per minute (WPM). Average adult reads 200-300 WPM.
Study Planner
Free study planner. Enter your exam date, total study hours and daily availability to generate a balanced study schedule across your topics.
Random Team Generator
Free random team generator. Paste names and choose the number of teams to randomly split people into balanced groups. Great for sports, class projects and games.
To-Do List
Free browser to-do list. Add tasks, check them off, filter by status, and clear completed items. All data saved locally.
Typing Speed Test
Free typing speed test. Measure your words per minute (WPM) and accuracy with a timed typing test. Shows real-time stats.
🎓 Education
GPA Calculator
Free GPA calculator. Add courses with grades and credit hours to calculate your GPA on a 4.0 scale. Supports letter grades A-F.
Multiplication Table Generator
Free multiplication table generator. Enter a number to see its full multiplication table, or generate a complete times table grid up to 20×20.
Test Grade Calculator
Free test grade calculator. Enter your score and total points to get the percentage and letter grade (A, B, C, D or F) instantly.