Free Online Tools & Calculators

Convert colors between HEX, RGB, HSL, HSV, CMYK, and CSS formats instantly. Pick a color visually and get all color codes at once.

Generate beautiful color palettes from any base color. Create complementary, analogous, triadic, split-complementary, and monochromatic color schemes.

Check color contrast ratios for WCAG 2.1 accessibility compliance. Test AA and AAA levels for normal text, large text, and UI components.

Generate beautiful CSS gradients visually. Create linear, radial, and conic gradients with multiple color stops and copy the CSS code instantly.

Upload an image and click anywhere to pick colors. Extract the dominant color palette from any image and get HEX, RGB, and HSL codes instantly.

Generate CSS box-shadow code visually with live preview. Adjust offset, blur, spread, color, and opacity. Add multiple shadows and copy the CSS.

Generate CSS border-radius values visually. Create circles, pills, asymmetric shapes, and custom curved corners with live preview and CSS code output.

Generate CSS triangles using the border trick. Create arrows and triangle shapes in any direction, size, and color without images or SVG.

Generate a harmonious typography scale for your design system. Choose a base font size and scale ratio to create consistent heading and body text sizes.

Generate favicons from text, emoji, or simple shapes. Create favicon.ico and PNG files in all required sizes for browsers and devices.

Calculate and maintain aspect ratios for images, videos, and screen sizes. Find width or height for any aspect ratio. Common ratios: 16:9, 4:3, 1:1, 21:9.

Check your current screen resolution, viewport size, device pixel ratio, and color depth. Compare with common screen resolutions and breakpoints.

Simulate how colors and images appear to people with color blindness. Test designs for deuteranopia, protanopia, tritanopia, and achromatopsia.

Generate a consistent spacing scale for your design system. Create CSS custom properties for margin, padding, and gap based on a base unit.

Resize images online for free. Crop, scale, and convert images to JPG, PNG, or WebP format — all processed locally in your browser, no upload needed.

Calculate your exact age in years, months, days, and hours from your date of birth.

Count the exact number of days, weeks, and months between any two dates.

Count down to any future date or event. Share your countdown with a link.

Convert Unix timestamps to readable dates and vice versa. Supports seconds and milliseconds.

Calculate days between dates, add or subtract time from a date, and find the day of the week.

See the current time in major cities worldwide. Compare time zones at a glance. Auto-updates every second.

Convert a specific time from one time zone to another. Handles daylight saving time automatically.

Count business days between two dates or find a date that is N working days away. Excludes weekends.

Pick any color and get HEX, RGB, HSL, and HSB values instantly.

Generate strong, random passwords. Customize length, symbols, numbers, and more.

Generate QR codes for URLs, text, WiFi, email, and more. Download as PNG.

Format, validate, and minify JSON. Instantly spot syntax errors.

Encode any text to Base64 or decode Base64 strings back to plain text.

Encode special characters in URLs or decode percent-encoded URLs.

Generate random UUIDs (v4). Bulk generate up to 100 at once. One-click copy.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.

Generate placeholder Lorem Ipsum text by paragraphs, sentences, or words.

Convert any title or phrase into a clean, SEO-friendly URL slug.

Convert numbers between binary, octal, decimal, and hexadecimal.

Write Markdown and see a live rendered preview. Supports headings, tables, code blocks, bold, italic, and links.

Test regular expressions with live match highlighting, capture group details, and common pattern library.

Convert text to binary, hex, octal, or decimal — and back. Supports ASCII and UTF-8 encoding.

Calculate tip amount and split the bill between any number of people.

Calculate your monthly mortgage payment, total interest paid, and full amortization schedule.

Calculate the sale price after a discount. Find out how much you save.

Visualize how your money grows with compound interest over time.

Convert annual salary to hourly, daily, weekly, and monthly rates.

Calculate how long to pay off any loan and how much interest you will pay in total.

See how long it takes to pay off your credit card and how to save on interest.

Add or remove VAT and sales tax from any price. Supports any tax rate.

Find out how much to save each month to reach your financial goal.

Calculate your monthly car payment, total interest, and true cost of a vehicle loan.

Project your retirement savings based on contributions, returns, and years to retirement.

Estimate your net salary after federal tax, state tax, Social Security, and Medicare.

Calculate the hourly rate you need to charge as a freelancer to hit your income goal.

Find your break-even point in units and revenue. Essential for pricing and business planning.

Scale any recipe up or down by servings. Convert recipe measurements between cups, tablespoons, teaspoons, grams, and ounces instantly.

Convert cooking measurements instantly. Cups to ml, tablespoons to grams, ounces to cups, and more. Includes ingredient-specific weight conversions.

Calculate calories burned by activity and daily calorie needs. Enter your weight, activity, and duration to get accurate calorie burn estimates.

Convert oven temperatures between Fahrenheit, Celsius, and Gas Mark. Instantly convert baking temperatures for any recipe.

Find substitutes for common baking ingredients. Missing buttermilk, eggs, or baking powder? Get exact substitution ratios instantly.

Calculate alcohol units in any drink. Find out how many UK units or standard drinks are in beer, wine, spirits, and cocktails based on volume and ABV.

Calculate the perfect coffee-to-water ratio for any brew method. Get exact measurements for espresso, pour over, French press, cold brew, and more.

Find safe internal cooking temperatures for beef, chicken, pork, fish, and more. Includes USDA recommended temperatures and doneness levels.

Create a nutrition label for any food or recipe. Enter macronutrients and micronutrients to generate a US FDA-style nutrition facts panel.

Calculate your Body Mass Index and find out if you are underweight, normal, overweight, or obese.

Calculate your Total Daily Energy Expenditure based on activity level and body stats.

Find the daily calorie deficit you need to lose weight at your target pace.

Calculate your daily protein, carbs, and fat targets based on your goals.

Calculate pace, speed, and finish time for any running distance.

Find the best times to wake up or go to sleep based on 90-minute sleep cycles.

Estimate your 1RM for any lift using weight and reps. Includes percentage table.

Calculate your recommended daily water intake based on weight and activity level.

Find your 5 heart rate training zones based on your age and resting heart rate.

Calculate percentages instantly. What is X% of Y? X is what percent of Y? And more.

Add, subtract, multiply, and divide fractions. Automatically simplifies results.

Calculate mean, median, mode, range, variance, and standard deviation from a data set.

Convert numbers to Roman numerals and Roman numerals back to numbers.

Calculate the Greatest Common Divisor and Least Common Multiple of two or more numbers with prime factorization.

Solve ax² + bx + c = 0. Shows real and complex roots, discriminant, vertex, and parabola properties.

Find any side of a right triangle using a² + b² = c². Shows angles, area, and perimeter.

Check if a number is prime, find its prime factors, or generate all primes up to any limit.

Full scientific calculator with trig, log, powers, roots, factorial, π, e, and calculation history.

Generate random numbers within any range. Single or multiple numbers, no repeats option.

Flip a virtual coin. Get heads or tails instantly. Flip multiple times and track statistics.

Find out how much house you can afford based on your income, debts, and down payment using the 28/36 rule.

Compare the true long-term cost of renting vs buying a home, including equity, appreciation, and opportunity cost.

Calculate if refinancing saves money. See monthly savings, break-even point, and lifetime interest saved.

Calculate your home equity, LTV ratio, and how much you can borrow with a HELOC or home equity loan.

Estimate home buying closing costs including lender fees, title insurance, appraisal, and prepaid items.

Calculate how much down payment you need and how long to save. Compare 3%, 5%, 10%, and 20% options.

Estimate your annual and monthly property tax. Compare rates across all 50 US states.

Calculate gross/net rental yield, cap rate, and cash-on-cash return for any investment property.

Calculate room square footage for rectangles, triangles, circles, and L-shapes. Add multiple rooms and estimate flooring costs.

See how extra mortgage payments save interest and accelerate your payoff date by months or years.

Generate SEO meta tags, Open Graph tags, and Twitter Card tags for any webpage. Preview how your page looks in search results and social media.

Build UTM-tagged URLs for Google Analytics campaign tracking. Generate campaign, source, medium, term, and content parameters.

Calculate the estimated reading time for any article or text. Paste your content and get reading time for different audiences instantly.

Analyze the frequency of words in any text. Find the most common words, keyword density, and unique word count. Great for SEO and content analysis.

Analyze keyword density in your content. Check how often specific keywords appear and whether you're in the optimal 1–2% SEO range.

Generate a robots.txt file for your website. Control which search engine bots can crawl your pages, block directories, and set your sitemap URL.

Generate an XML sitemap for your website. Enter your URLs with priority and change frequency settings to create a valid sitemap.xml file.

Preview how your page looks in Google search results. Test your title and meta description with live character count feedback before publishing.

Preview how your website looks when shared on Facebook, Twitter/X, LinkedIn, and WhatsApp. Test your OG tags and Twitter Card meta tags.

Generate JSON-LD structured data markup for your website. Create schema for articles, FAQs, products, local businesses, and breadcrumbs.

Count words, characters, sentences, and paragraphs. Get reading time estimates.

Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case and more.

Count characters for Twitter/X, LinkedIn, Instagram and other social media platforms.

Convert between 30+ major world currencies using approximate exchange rates. Quick reference for travel, shopping, and international transactions.

Estimate flight time between major world cities. Calculate approximate travel time based on great-circle distance and aircraft cruising speed.

Calculate the distance between any two major world cities in kilometers and miles. Shows great-circle and estimated driving distance.

Convert between mph and km/h for driving speeds. See speed limits for major countries. Essential for international driving.

Find which plug adapter you need for any country. See plug types A–N, voltage, and frequency for 50+ countries.

Plan your travel budget by destination. Calculate daily costs for accommodation, food, transport, and activities for 12 regions worldwide.

Quick reference for any country: capital, population, currency, calling code, languages, timezone, and more for 65+ countries.

Generate a customized travel packing list based on trip type, duration, climate, and activities. Never forget essential travel items again.

Quick reference for converting between metric and US/imperial measurements. Temperature, distance, weight, volume, and speed conversions for travelers.

Check if your luggage meets airline weight limits. Convert kg to lbs, compare against major airline allowances, and calculate overage implications.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly.

Convert between pounds, kilograms, ounces, grams, stones, and more.

Convert between meters, feet, inches, miles, kilometers, and more length units.

Convert between liters, gallons, cups, fluid ounces, milliliters, and more.

Convert between mph, km/h, m/s, knots, and more speed units.

Convert between bits, bytes, KB, MB, GB, TB, and beyond.

Convert between square meters, square feet, acres, hectares, and more area units.

Convert between pascals, bar, PSI, atmospheres, mmHg, kPa, and more pressure units.

Convert between joules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, and electron-volts.

Convert between MPG (US/UK), L/100km, km/L, and miles per liter fuel economy units.