Utility Tools — Free Online Everyday Utilities
Everyday tasks — converting units, calculating percentages, generating QR codes, setting timers — should not require installing an app or creating an account. These utility tools cover the most common calculations and conversions people search for daily, all running instantly in the browser. Generate QR codes for URLs, WiFi networks, vCards, and text with customizable colors and logo embedding. Calculate percentages, percentage change, and discounts with six calculation modes that update as you type. Convert between length, weight, temperature, speed, area, and volume units with 50+ unit pairs. Set countdown timers with presets and fullscreen mode, or use a precision stopwatch with lap tracking and CSV export. Calculate age with birthday countdown and zodiac signs, compute BMI with visual gauge, find the difference between dates, convert Roman numerals, and spell numbers in words.
QR Code Generator
Generate QR codes for URLs, WiFi, text, and more
Percentage Calculator
Calculate percentages, percentage change, and discounts instantly
Age Calculator
Calculate your exact age with birthday countdown and milestones
BMI Calculator
Calculate your BMI with instant results and visual gauge
Countdown Timer
Set a countdown timer with alarm, presets, and fullscreen mode
Online Stopwatch
Free online stopwatch with lap timer, millisecond precision, and keyboard shortcuts
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and more instantly
Roman Numeral Converter
Convert numbers to Roman numerals and back instantly
Time Zone Converter
Convert and compare up to 5 time zones with DST support
Fraction to Decimal Converter
Convert fractions to decimals with step-by-step work
Date Difference Calculator
Calculate the days, weeks, months, and years between any two dates
Tip Calculator
Calculate tips, split bills, and share the breakdown
Unit Converter
Convert length, weight, temperature, speed, area, and volume instantly
Number to Words Converter
Convert numbers to words, currency, and check writing format
When to Use Utility Tools
Use utility tools for the quick calculations and conversions that come up throughout the day. Generate a QR code to share a URL at a conference or on printed materials. Calculate a tip and split the bill at a restaurant. Convert kilometers to miles when reading international news. Set a timer for cooking, meetings, or study sessions. Calculate your exact age for visa applications or insurance forms. Find the number of business days between two dates for project planning. Convert fractions to decimals for homework or recipe scaling.
Frequently Asked Questions
Do utility tools work offline?
Yes. Once the page loads, every utility tool runs entirely in your browser without any server calls. You can set timers, calculate percentages, convert units, and generate QR codes with no internet connection. Your data never leaves your device.
Can I download QR codes as images?
Yes. The QR Code Generator lets you download your QR code as PNG or SVG. You can customize the foreground and background colors, change cell styles, and add a logo before downloading. SVG exports are resolution-independent, ideal for print materials.
How accurate are the unit conversions?
All conversion factors use the exact definitions from the International System of Units (SI) and NIST standards. Temperature conversions use the precise formulas (e.g., F = C x 9/5 + 32). Results are displayed with appropriate decimal precision to avoid floating-point rounding artifacts.