119+ Free Online ToolsThat Just Work
Fast, privacy-friendly utilities for developers, students, and everyday tasks. Everything runs right in your browser — no signup, no upload, no tracking.
Showing all 119 tools
Finance Calculators
APY Calculator
Convert APR to APY accounting for compounding frequency.
Credit Card Minimum Payment Calculator
See how your minimum payment splits between interest and principal.
Cash Back Calculator
Calculate true value of cash back rewards after annual fees.
Down Payment Calculator
Find your down payment amount and PMI status.
Debt-to-Income Calculator
Calculate DTI ratio and see if lenders will approve you.
Commission Calculator
Calculate sales commission plus base salary.
Bill Split Calculator
Split a bill evenly including tip.
Savings Goal Calculator
Find the monthly amount needed to reach any savings goal.
Net Worth Calculator
Calculate your net worth — assets minus liabilities.
Annuity Calculator
Find annual and monthly payouts from a principal over N years.
Capital Gains Tax Estimator
Estimate capital gains tax on investments (short vs long-term rates).
Rent vs Buy Calculator
Compare total cost of buying vs renting over a time period.
Inflation Calculator
See how inflation reduces the value of money over time.
Retirement Calculator
Project your retirement savings with compound growth.
Simple Interest Calculator
Calculate simple interest with the I = Prt formula.
Unit Price Calculator
Compare unit prices to find the real best deal.
Mortgage Calculator
Calculate monthly mortgage payments and total interest.
Markup Calculator
Find selling price and margin from cost and markup.
Hourly to Salary Calculator
Convert your hourly wage to annual salary.
ROI Calculator
Calculate total and annualized return on investment.
Credit Card Payoff Calculator
See how long to pay off your credit card balance.
Income Tax Estimator
Estimate US federal income tax and take-home pay.
Compound Interest Calculator
See how your savings grow with the power of compound interest.
Sales Tax Calculator
Add or remove sales tax from any price instantly.
Tip Calculator
Calculate tips and split bills fairly among any number of people.
Discount Calculator
Find the final price after any discount and see how much you save.
Loan Calculator
Calculate monthly payments, total interest, and full cost of any loan.
Time Calculators
Education Calculators
Math Calculators
Trapezoid Calculator
Find trapezoid area from two parallel sides and height.
Cube Calculator
Find cube volume and surface area.
Sphere Calculator
Find sphere volume and surface area from radius.
Scientific Notation Converter
Convert numbers to scientific, E-, and engineering notation.
Prime Number Checker
Check if any number is prime and find adjacent primes.
Prime Factorization Calculator
Decompose any number into its prime factors.
Combination Calculator
Calculate combinations (n choose r) for probability and odds.
Permutation Calculator
Calculate permutations (arrangements where order matters).
Circle Calculator
Find circle area, circumference, and diameter from radius.
Triangle Calculator
Solve right triangles — hypotenuse, area, perimeter.
Rectangle Calculator
Find rectangle area, perimeter, and diagonal.
Standard Deviation Calculator
Calculate standard deviation, variance, and mean.
Percentile Calculator
Find the value at any percentile of your data.
Fraction Calculator
Add, subtract, multiply, divide fractions with exact math.
Ratio Calculator
Solve proportions and find missing ratio values.
LCM & GCD Calculator
Find LCM and GCD of any set of numbers.
Average Calculator
Calculate mean, median, sum, min, max, and range of any number list.
Percentage Calculator
Calculate percentages, increases, decreases, and discounts instantly.
Developer Tools
Hash Generator (SHA-256)
Generate SHA-256 and SHA-1 hashes from text.
Binary to Text Converter
Decode binary back to readable text.
Text to Binary Converter
Convert text characters to binary representation.
URL Query Parser
Extract URL query parameters into a JSON object.
Text Size Estimator
Estimate byte size of your text in various formats.
JSON Formatter
Format and validate JSON with proper indentation.
JSON Minifier
Remove all whitespace to minimize JSON size.
CSV to JSON Converter
Convert CSV data to a JSON array using the header row.
JSON to CSV Converter
Convert a JSON array of objects to CSV format.
UUID Generator
Generate random v4 UUIDs for databases, sessions, and APIs.
Lorem Ipsum Generator
Generate placeholder text for mockups and designs.
Random Number Generator
Generate random numbers in any range, with optional uniqueness.
Base64 Encoder
Encode text to Base64 instantly with proper UTF-8 support.
Base64 Decoder
Decode Base64 back to text instantly.
HTML Escape
Escape HTML special characters to prevent XSS attacks.
HTML Unescape
Convert HTML entities back to readable characters.
URL Encoder
Encode text for safe use in URLs.
URL Decoder
Decode percent-encoded URLs back to text.
Slug Generator
Convert titles into clean, SEO-friendly URL slugs instantly.
Text Tools
Slug to Title Converter
Convert URL slugs back to readable titles.
HTML Tag Stripper
Remove all HTML tags to get clean readable text.
Character Frequency Counter
Count how often each character appears in text.
Email Extractor
Pull all email addresses out of any text.
URL Extractor
Pull all web links out of any text.
Text Diff Checker
Compare two texts and see what changed.
Add Line Numbers
Add line numbers to each line of your text.
Text to List Converter
Add bullet points to each line of text.
Uppercase Converter
Convert any text to ALL UPPERCASE instantly.
Lowercase Converter
Convert any text to lowercase instantly.
Title Case Converter
Capitalize the first letter of each word for titles and headings.
Sentence Case Converter
Capitalize the first letter of each sentence automatically.
Reverse Text Generator
Reverse any text — fun for puzzles and ciphers.
Remove Duplicate Lines
Clean up lists by removing duplicate lines while keeping order.
Sort Text Lines
Sort any list alphabetically in one click.
Remove Line Breaks
Join multi-line text into a single line.
Find and Replace Text
Find and replace any text instantly.
Whitespace Remover
Clean up messy spacing in any text.
Word Counter
Count words, characters, sentences, and reading time instantly.
Unit Converters
Mass Converter
Convert between metric, carats, and grains.
Density Converter
Convert between density units for physics and chemistry.
Power Converter
Convert between watts, kilowatts, horsepower, and BTU.
Flow Rate Converter
Convert between L/min, GPM, CFM and more flow units.
Data Storage Converter
Convert between bytes, KB, MB, GB, TB and more.
Time Converter
Convert between seconds, minutes, hours, days and more.
Number Base Converter
Convert between binary, octal, decimal, and hex.
Angle Converter
Convert between degrees, radians, and gradians.
Fuel Economy Converter
Convert between MPG and L/100km for car efficiency.
Pressure Converter
Convert between bar, PSI, pascal, atm and more.
Energy Converter
Convert between joules, calories, kWh, and BTU.
Frequency Converter
Convert between Hz, kHz, MHz, GHz, and RPM.
Weight Converter
Convert between metric and imperial weight units instantly.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Speed Converter
Convert between km/h, mph, m/s, knots, and ft/s instantly.
Area Converter
Convert between metric and imperial area units, including acres and hectares.
Volume Converter
Convert between metric and US cooking volume units instantly.
Length Converter
Convert between metric and imperial length units instantly.
Health Calculators
Body Fat Calculator
Estimate body fat % using circumference measurements.
Macro Calculator
Split daily calories into protein, carbs, and fat.
Pregnancy Due Date Calculator
Estimate due date from your last menstrual period.
Calorie Calculator
Find your daily calorie needs for weight loss or gain.
BMR Calculator
Calculate calories your body burns at complete rest.
Water Intake Calculator
Find your ideal daily water intake.
Ideal Weight Calculator
Find your ideal body weight based on height and gender.
BMI Calculator
Calculate your Body Mass Index and see your healthy weight range.
Web Design Tools
Security Tools
Business Tools
Why Use Our Online Tools?
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- Privacy by design. Your text and files never leave your device. There is no server processing your input, so there is nothing to leak.
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We focus on utilities that solve a single problem well — from calculating loan payments and converting units, to formatting JSON and generating QR codes. With 119+ tools across finance, math, health, unit conversion, and developer utilities, there's a good chance we have what you need. New tools are added regularly, so bookmark this page.