Free web tools that just work.
Fast, free, no-signup web tools that run in your browser.
100% in your browser. No uploads, no accounts, no server processing — your data never leaves your device, so these tools are safe for confidential and business use.
- 100% in your browser
- No uploads
- No sign-up
- Safe for business
Converter 16
- Angle ConverterConvert angle units instantly in your browser — degrees, radians, gradians, and turns. No uploads, no signup.
- Area ConverterConvert area between square meters, square feet, acres, hectares, square miles, and more instantly in your browser. Nothing is uploaded.
- Clothing Size ConverterConvert clothing sizes XS–XXL between US, UK, and EU numeric for men and women tops instantly in your browser. Nothing is uploaded.
- Data Storage ConverterConvert data storage between bits, bytes, KB, MB, GB, TB (decimal) and KiB, MiB, GiB, TiB (binary) instantly in your browser. Nothing is uploaded.
- Energy ConverterConvert energy units — joules, kilojoules, calories, kilocalories, watt-hours, kWh, and BTU — instantly in your browser. Nothing is uploaded.
- Frequency ConverterConvert frequency units instantly in your browser — Hz, kHz, MHz, GHz, and RPM. No uploads, no signup.
- Fuel Economy ConverterConvert fuel economy between MPG (US), MPG (UK/imperial), L/100km, and km/L instantly in your browser. Results update as you type — nothing is uploaded.
- Height ConverterConvert height between centimeters and feet/inches instantly in your browser. Supports cm to ft/in and ft/in to cm. Nothing is uploaded.
- Oven Temperature ConverterConvert oven temperatures between Celsius, Fahrenheit, gas mark and fan/convection — with a handy conversion chart. Runs in your browser.
- Power ConverterConvert power units instantly in your browser — watts, kilowatts, megawatts, horsepower, and BTU/h. No uploads, no signup.
- Pressure ConverterConvert pressure units instantly in your browser — Pa, kPa, bar, psi, atm, mmHg, and torr. No uploads, no signup.
- Shoe Size ConverterConvert shoe sizes between US, UK, EU, and CM for men and women instantly in your browser. Nothing is uploaded.
- Speed ConverterConvert speed between m/s, km/h, mph, knots, and ft/s instantly in your browser. Results update as you type. Nothing is uploaded.
- Temperature ConverterConvert temperatures between Celsius, Fahrenheit, and Kelvin instantly in your browser. Results update as you type. Nothing is uploaded.
- Time Unit ConverterConvert time durations between milliseconds, seconds, minutes, hours, days, weeks, and years instantly in your browser. Nothing is uploaded.
- Unit Converter (Length, Weight, Temperature, Volume)Convert length, weight, temperature, and volume units instantly in your browser. Supports meters, miles, kilograms, pounds, Celsius, Fahrenheit, liters, gallons, and more.
Design 15
- Aspect Ratio CalculatorSimplify any width × height to its aspect ratio (e.g. 1920×1080 → 16:9) and resize while keeping the ratio. Runs entirely in your browser.
- Color Blindness SimulatorSee how any color looks with protanopia, deuteranopia, tritanopia, and achromatopsia. Runs entirely in your browser — nothing is uploaded.
- Color Contrast CheckerCheck WCAG contrast ratio between two hex colors and see pass/fail results for AA and AAA levels for normal and large text. Nothing is uploaded.
- Color MixerMix and blend two colors at an adjustable ratio and copy the resulting hex. Runs entirely in your browser — nothing is uploaded.
- Color Name FinderFind the nearest CSS named color to any hex value using Euclidean RGB distance. See the name, exact CSS value, and how close the match is. Nothing is uploaded.
- Color Shades & Tints GeneratorGenerate a palette of shades (toward black) and tints (toward white) from any base hex color. Instant, client-side, nothing uploaded.
- CSS Border Radius GeneratorGenerate CSS border-radius declarations per corner. Set equal or independent radii for each corner and copy the optimised CSS value. Everything runs in your browser, nothing is uploaded.
- CSS Box Shadow GeneratorGenerate CSS box-shadow declarations visually. Adjust offset, blur, spread, color, and inset, then copy the ready-to-use CSS. Everything runs in your browser, nothing is uploaded.
- CSS Filter GeneratorGenerate CSS filter chains visually. Adjust blur, brightness, contrast, grayscale, saturation, and more — copy the ready-to-use CSS. Everything runs in your browser, nothing is uploaded.
- CSS Gradient GeneratorBuild linear and radial CSS gradients from color stops and copy the ready-to-use background CSS string. Everything runs in your browser, nothing is uploaded.
- CSS Text Shadow GeneratorGenerate CSS text-shadow declarations visually. Adjust offset, blur, and color, then copy the ready-to-use CSS. Everything runs in your browser, nothing is uploaded.
- Golden Ratio CalculatorCalculate the golden ratio (φ ≈ 1.618) for design, typography, and layout. Get the longer and shorter parts, or split a total. Runs in your browser.
- Pixel Art EditorDraw pixel art and sprites in your browser — pick a grid size and palette, paint cells, and export a PNG. Free, nothing uploaded.
- PPI CalculatorCalculate a screen’s pixel density (PPI) from its resolution and diagonal size, plus dot pitch in mm. Runs entirely in your browser.
- Random Color GeneratorGenerate cryptographically random hex colors with optional hue and lightness constraints. Copy the hex code instantly. Nothing is uploaded.
Developer 37
- ASCII TableFull ASCII character table — decimal, hex, octal and binary codes for all 128 characters, with control-code names. Searchable, runs in your browser.
- Base64 Encoder / DecoderEncode or decode Base64 instantly in your browser — supports UTF-8, URL-safe variant, and standard padding. Nothing is uploaded.
- Chmod CalculatorConvert Unix file permissions between checkboxes, octal (e.g. 755), and symbolic (rwxr-xr-x) — two-way, live. Runs in your browser, nothing uploaded.
- Color Converter (HEX / RGB / HSL)Convert colors between HEX, RGB, and HSL formats instantly in your browser. Accepts #hex, rgb(), and hsl() inputs. Nothing is uploaded.
- Cron Expression ExplainerExplain cron expressions in plain English and preview the next run times. Supports standard 5-field cron syntax. Nothing is uploaded.
- CSV to Markdown TableConvert CSV to a GitHub-flavored Markdown table instantly in your browser. Supports quoted fields and custom delimiters. Nothing is uploaded.
- Download Time CalculatorCalculate how long a file download will take. Enter file size and connection speed to get the estimated time in hours, minutes, and seconds.
- gitignore GeneratorGenerate a .gitignore file for your project. Pick languages and environments — Node, Python, macOS, Windows, VSCode, Java — and get a ready-to-use file.
- Hash GeneratorGenerate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text instantly in your browser. Nothing is uploaded.
- HTML Entity Encoder / DecoderEncode special characters to HTML entities or decode entities back to plain text. Supports named, decimal, and hex numeric references. Runs entirely in your browser.
- HTML to Markdown ConverterConvert HTML to Markdown instantly in your browser. Paste HTML and get clean Markdown output. Nothing is uploaded.
- HTTP Status CodesComplete list of HTTP status codes with meanings — 200 OK, 301, 404, 500 and more, grouped by class. Searchable reference that runs in your browser.
- JSON DiffCompare two JSON objects and highlight added, removed, and changed keys instantly in your browser. Nothing is uploaded.
- JSON Formatter & ValidatorFormat, validate, and minify JSON instantly in your browser. Pretty-print with 2 or 4 spaces and get clear error messages. Nothing is uploaded.
- JSON to YAML ConverterConvert JSON to YAML instantly in your browser. Paste JSON and get clean YAML output. Nothing is uploaded.
- JSONPath TesterTest JSONPath expressions against JSON in your browser. Supports dot notation, array indexing, wildcards, and recursive descent. Nothing is uploaded.
- JWT DecoderDecode and inspect JWT header and payload instantly in your browser. No signature verification. Nothing is uploaded.
- Markdown PreviewPreview Markdown as HTML instantly in your browser. Supports headings, bold, italic, lists, links, and code blocks. Nothing is uploaded.
- Markdown Table GeneratorGenerate GitHub-flavored Markdown tables instantly in your browser. Add rows and columns, choose alignment, and copy the result. Nothing is uploaded.
- Meta Tag GeneratorGenerate HTML meta tags instantly — title, description, Open Graph, and Twitter Card. Copy-ready output, nothing uploaded.
- MIME Type LookupLook up the MIME (content) type for a file extension, or find which extensions use a given content type. Searchable reference — runs in your browser.
- Number Base Converter (Binary / Hex / Octal / Decimal)Convert numbers between binary, octal, decimal, and hexadecimal instantly in your browser. Supports bases 2–36. Nothing is uploaded.
- PX to REM ConverterConvert pixels to REM, REM to pixels, and PX to EM in your browser. Set a custom base font size. No upload needed.
- Regex TesterTest regular expressions against text and see all matches, capture groups, and positions. Supports all JavaScript regex flags. Nothing is uploaded.
- Resistor Color Code CalculatorDecode 4, 5, and 6-band resistor color codes into resistance, tolerance, and temperature coefficient. Runs entirely in your browser.
- robots.txt GeneratorGenerate a robots.txt file for your website. Allow or block crawlers, specify disallow paths, and add a sitemap URL — all in your browser.
- SQL FormatterFormat and beautify SQL queries instantly in your browser. Supports multiple dialects. Nothing is uploaded.
- String Escaper / UnescaperEscape and unescape strings for JSON, JavaScript, HTML, and URLs instantly in your browser. Nothing is uploaded.
- Subnet CalculatorIPv4 subnet / CIDR calculator: network, broadcast, host range, netmask, wildcard, and host counts. Runs entirely in your browser.
- Text Diff CheckerCompare two blocks of text line-by-line and see what was added, removed, or unchanged. Runs entirely in your browser — nothing is uploaded.
- Unix Timestamp ConverterConvert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds, ISO 8601, UTC, and local time. Runs entirely in your browser.
- URL Encoder / DecoderEncode or decode URL components instantly in your browser. Supports encodeURIComponent and encodeURI modes. Nothing is uploaded.
- URL ParserParse and inspect any URL in your browser. Instantly see the protocol, host, path, query parameters, and fragment — nothing is uploaded.
- User Agent ParserParse any User Agent string to detect browser, OS, and device type instantly in your browser. Nothing is uploaded.
- UTM Campaign URL BuilderBuild UTM-tagged campaign URLs for Google Analytics tracking. Append utm_source, utm_medium, utm_campaign, and more — nothing uploaded.
- XML Formatter & ValidatorFormat, validate, and minify XML instantly in your browser. Pretty-print with custom indentation and get clear syntax-error messages. Nothing is uploaded.
- YAML to JSON ConverterConvert YAML to JSON instantly in your browser. Paste YAML and get formatted JSON output. Nothing is uploaded.
Education 7
- Age on Other PlanetsSee how old you would be on Mercury, Venus, Mars, Jupiter and every other planet. Enter your birthday — runs entirely in your browser.
- Final Grade CalculatorFind out what score you need on your final exam to achieve your desired grade. Enter your current grade, the weight of the final, and your target.
- GPA CalculatorCalculate your weighted GPA from letter grades and credit hours. Add or remove courses, see your semester and cumulative GPA instantly.
- Greek Alphabet ChartThe 24 Greek letters with uppercase and lowercase forms, names, Latin equivalents, and pronunciation. Searchable chart, runs in your browser.
- Interactive Periodic TableExplore all 118 elements: symbols, atomic numbers, masses, groups, periods and categories. Search any element. Runs entirely in your browser.
- Multiplication TableGenerate and print a multiplication table — a full times-table grid up to any size, or a single number's times table. Free, runs in your browser.
- Typing Speed TestTest your typing speed (WPM) and accuracy on a real passage. Live stats, no sign-up — runs entirely in your browser.
Everyday 39
- Add to Calendar Link GeneratorGenerate a one-click Google Calendar link or download an .ics file for any event. Works with Apple Calendar, Outlook, and all major calendar apps. Runs entirely in your browser.
- Age & Date Difference CalculatorCalculate your exact age in years, months, and days, or find the difference between any two dates. Runs entirely in your browser.
- Bill SplitterSplit a restaurant bill with optional tip evenly or by custom shares among any number of people. See per-person amounts instantly — nothing is uploaded.
- Bingo Card GeneratorGenerate and print free 75-ball bingo cards. Random 5×5 cards with a FREE center — runs entirely in your browser, nothing is uploaded.
- Business Days CalculatorCount weekdays (Monday–Friday) between two dates, with inclusive or exclusive options, plus the total calendar days. Runs entirely in your browser.
- Calendar GeneratorGenerate and print a clean monthly calendar for any month and year. Choose a Sunday or Monday week start and optional ISO week numbers.
- Countdown TimerSet hours, minutes, and seconds, then count down with start, pause, and reset. An alert fires when the time reaches zero. Runs entirely in your browser.
- Countdown to DateCount down the days, hours, minutes, and seconds until any future date and time. Runs entirely in your browser — nothing is uploaded.
- Country Information & Dialing CodesLook up phone dialing codes, ISO 2/3 codes, capital cities, currencies and regions for every country.
- Currency Symbols & CodesSearchable list of world currency symbols and ISO 4217 codes — USD $, EUR €, GBP £, JPY ¥, INR ₹ and more. Currency names shown in your language.
- Date Add / Subtract CalculatorAdd or subtract any number of days, weeks, months, or years from a date and get the resulting date. Runs entirely in your browser.
- Date Difference CalculatorFind the exact difference between two dates in years, months, and days, plus the total number of days. Runs entirely in your browser.
- Days Until Date CalculatorCalculate the number of whole days from a start date to any target date. Runs entirely in your browser — nothing is uploaded.
- Decision Wheel (Random Picker)Spin the decision wheel to pick a random option. Paste your choices, hit Spin, and let crypto-random chance decide. Nothing is uploaded.
- Event Time Zone ConverterConvert an event time from one time zone to any other — see the local time in New York, London, Tokyo and more. No uploads, no accounts.
- Feels Like Temperature CalculatorCalculate the apparent "feels like" temperature from heat index or wind chill. Enter temperature, humidity, and wind — runs in your browser.
- Graph Paper GeneratorMake printable graph or grid paper — squares or dot grid — at any spacing on A4 or Letter. 100% in your browser, ready to print.
- Leap Year CheckerCheck if any year is a leap year, with days in the year plus the next and previous leap years. Runs in your browser — nothing is uploaded.
- Magic 8-BallAsk the Magic 8-Ball any yes/no question and get one of the classic 20 answers. Powered by your browser's secure random API.
- Maze GeneratorGenerate a random printable maze in any size. Pick small, medium or large, make a new one, and print it — all in your browser.
- Meeting Time PlannerFind the best meeting time across multiple time zones. Enter IANA zone names and a date to see which hours work for your whole team.
- Moon Phase CalculatorFind the moon phase for any date — phase name, illumination percentage and moon age. Calculated in your browser using a precise lunar model.
- Paper SizesISO A & B series and US paper sizes with exact dimensions in millimeters, centimeters and inches — A4, A3, Letter, Legal and more. In your browser.
- Pomodoro TimerWork in focused 25-minute sessions separated by short 5-minute breaks. Configurable durations auto-switch between work and break cycles. Runs in your browser.
- Public HolidaysSee public holidays for any year in the US, UK, Canada, Germany, France, Korea, Japan, China and more — dates and weekdays. Runs in your browser.
- Random Team GeneratorSplit a list of names into balanced random teams instantly in your browser. Cryptographically shuffled and evenly distributed. Nothing is uploaded.
- Reaction Time TestTest your visual reaction time — click when the box turns green. Measures your reflex speed in milliseconds. Runs entirely in your browser.
- Ring Size ConverterConvert ring sizes between US, UK and EU, or find your size from a diameter or circumference in mm. Runs entirely in your browser.
- Rock Paper ScissorsPlay Rock Paper Scissors against the computer. The CPU picks randomly using your browser's secure crypto API — no patterns, no cheating.
- Secret Santa GeneratorRandomly assign Secret Santa gift-givers and receivers so nobody gets themselves. Uses cryptographically random shuffling. Nothing is uploaded.
- StopwatchStart, pause, and reset a stopwatch with hundredths precision. Record lap times and copy the full lap list. Runs entirely in your browser.
- Sudoku GeneratorGenerate printable Sudoku puzzles with solutions in easy, medium, or hard. Free, unlimited, and 100% in your browser — nothing is uploaded.
- Sunrise & Sunset TimesCalculate sunrise, sunset, solar noon and day length for any latitude, longitude and date. Runs entirely in your browser — nothing is uploaded.
- Tally CounterA big tap/click tally counter to count people, reps, laps, or inventory. Keyboard shortcuts, optional limits, and your count is saved in your browser.
- Time Card CalculatorEnter clock-in, clock-out, and unpaid break for each day to get daily and weekly hours plus optional pay. Runs entirely in your browser.
- Time Duration CalculatorCalculate the duration between two times of day instantly in your browser. Handles midnight crossings automatically. Nothing is uploaded.
- Time Zone ConverterConvert times between any two IANA time zones instantly in your browser. Handles daylight saving automatically. Nothing is uploaded.
- Week Number CalculatorFind the ISO-8601 week number and weekday name for any date. Runs entirely in your browser — nothing is uploaded.
- World ClockSee the current time in multiple cities around the world, updated every second. Uses your browser's Intl API — nothing is sent to a server.
Finance 21
- 50/30/20 Budget CalculatorSplit your monthly after-tax income into needs (50%), wants (30%), and savings (20%) using the popular 50/30/20 budgeting rule. Runs in your browser.
- Break-Even CalculatorFind how many units you need to sell to break even. Enter fixed costs, price per unit, and variable cost per unit. Free, fast, browser-based.
- Compound Interest CalculatorCompute future value and interest earned from a principal, annual rate, compounding frequency, years, and optional monthly contribution. Runs in your browser.
- Debt Payoff CalculatorCalculate how many months to pay off a debt given the balance, APR, and monthly payment. See total interest paid. Runs in your browser.
- Debt-to-Income Ratio CalculatorCalculate your debt-to-income (DTI) ratio: monthly debt payments divided by gross monthly income. Lenders use DTI to assess loan eligibility. Runs in your browser.
- Discount CalculatorFind the final price and amount saved from a percentage discount and optional second coupon or stacked discount. Runs entirely in your browser.
- Electricity Cost CalculatorEstimate the running cost of any appliance from its wattage, hours of use, and your price per kWh. Runs entirely in your browser.
- Emergency Fund CalculatorCalculate how much you need in your emergency fund and how many months your current savings cover. Based on monthly essential expenses and your savings target.
- Inflation CalculatorSee how inflation changes the value and purchasing power of money over time. Find future cost or past value at any rate. 100% in your browser.
- Loan & Mortgage Payment CalculatorCalculate monthly payments, total paid, and total interest for any loan or mortgage. Standard amortization formula — runs entirely in your browser.
- Mortgage CalculatorEstimate your monthly mortgage payment from home price, down payment, rate, and term, plus a year-by-year amortization schedule. Runs in your browser.
- Net Worth CalculatorCalculate your net worth instantly: enter total assets and total liabilities to see your financial position. Runs entirely in your browser — nothing is uploaded.
- Paycheck / Take-Home CalculatorEstimate your take-home pay after a combined deduction % (tax + other). Supports annual, monthly, and biweekly pay periods. Simplified generic estimate.
- Profit Margin CalculatorCalculate profit, gross margin %, and markup % from cost and revenue. Fast, free, and runs entirely in your browser.
- ROI CalculatorCalculate return on investment (ROI %) and net gain from your initial cost and final value. Free, fast, and runs entirely in your browser.
- Rule of 72 CalculatorEstimate how long it takes to double your money at a given rate, or what rate you need to double in a target number of years. Runs in your browser.
- Salary to Hourly ConverterConvert between hourly, weekly, monthly, and annual salary. Adjust hours per week and weeks per year. Runs entirely in your browser.
- Savings Goal CalculatorFind out how many months it takes to reach a savings target given a monthly deposit and annual interest rate. Shows total contributed vs interest earned.
- Simple Interest CalculatorCalculate interest and total amount using the simple interest formula: I = P × r × t. Runs entirely in your browser.
- Tip CalculatorCalculate tip amount, total bill, and per-person share for any bill size, tip percentage, and party size. Runs entirely in your browser.
- VAT / Sales Tax CalculatorAdd VAT or sales tax to a net price, or strip tax from a gross (tax-inclusive) price at any rate. Runs entirely in your browser.
Fitness 5
- Calories Burned CalculatorEstimate calories burned during exercise using the MET method. Pick an activity, enter weight and duration. Metric and imperial supported.
- Heart Rate Zone CalculatorCalculate your 5 heart rate training zones from your age. Supports the standard 220-minus-age and Tanaka formulas. Runs entirely in your browser.
- One-Rep Max CalculatorCalculate your one-rep max (1RM) with the Epley and Brzycki formulas. Enter weight and reps to estimate max strength and see a percentage table.
- Running Pace CalculatorCalculate running pace, time, or distance from any two inputs. Supports metric (min/km) and imperial (min/mi). Runs entirely in your browser.
- Steps to Distance CalculatorConvert step count to distance and calories in your browser. Enter steps, your height or stride length, and choose metric or imperial. Nothing is uploaded.
Generator 15
- Coin FlipFlip a fair virtual coin — Heads or Tails — instantly in your browser. Uses the Web Crypto API for true randomness. Nothing is uploaded.
- Color Palette GeneratorGenerate harmonious color palettes instantly in your browser. Colors are spaced evenly around the HSL wheel for natural harmony. Nothing is uploaded.
- Dice RollerRoll any combination of dice (d4, d6, d8, d10, d12, d20) instantly in your browser. All randomness uses the Web Crypto API. Nothing is uploaded.
- Meme GeneratorMake memes in your browser — upload an image, add top and bottom captions in classic meme style, and download a PNG. Nothing is uploaded.
- Password GeneratorGenerate strong, random passwords in your browser. Choose length, character sets, and avoid ambiguous characters. Nothing is uploaded.
- QR Code GeneratorGenerate a QR code as an SVG from any URL or text, instantly in your browser. Nothing is uploaded — all generation happens locally.
- Random Decision MakerPaste a list of options and let the tool pick one at random. Also includes a simple Yes/No picker. All randomness uses the Web Crypto API. Nothing is uploaded.
- Random Name PickerPaste a list of names and pick one or more unique winners at random. Perfect for giveaways, classroom draws, or team selection. Nothing is uploaded.
- Random Number GeneratorGenerate one or many random integers in any range, with optional uniqueness. Uses the cryptographic random source — nothing is uploaded.
- Random PIN GeneratorGenerate cryptographically random PINs of any length in your browser. Unbiased, secure, and nothing is uploaded.
- Signature MakerDraw your handwritten signature and download it as a transparent PNG. 100% in your browser — nothing is uploaded.
- Slack Emoji MakerMake custom Slack and Discord emoji from text — pick colors, font and shape, preview live and download a 128×128 PNG. Free, in your browser.
- Username GeneratorGenerate unique, creative usernames instantly in your browser. Choose random or word-based styles with custom length limits. Nothing is uploaded.
- UUID GeneratorGenerate one or more random UUID v4 values instantly in your browser. Nothing is uploaded — all generation happens locally using the Web Crypto API.
- Word Cloud GeneratorTurn any text into a word cloud — word size reflects how often each word appears. Free, runs in your browser, nothing uploaded.
Health 17
- Blood Alcohol (BAC) CalculatorEstimate blood alcohol content using the Widmark formula. Enter drinks, weight, and time elapsed. For informational use only — never drink and drive.
- Blood Sugar ConverterConvert blood glucose between mg/dL and mmol/L instantly in your browser. No data is uploaded or stored.
- Blood Type Compatibility ChartSee which blood types can donate to or receive from each other (ABO + Rh). Full 8×8 donor/recipient chart, runs in your browser.
- BMI CalculatorCalculate your Body Mass Index in metric or imperial units. Enter weight and height to get your BMI and weight category instantly in your browser.
- BMR CalculatorCalculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Supports metric (kg/cm) and imperial (lb/in) units. Runs entirely in your browser.
- Body Fat Percentage CalculatorEstimate body fat percentage using the US Navy circumference method. Enter height, neck, and waist (plus hip for women). Supports metric and imperial units.
- Conception Date CalculatorEstimate when conception occurred from your due date (due minus 266 days) or from your LMP (LMP plus 14 days). Runs entirely in your browser.
- Daily Water Intake CalculatorEstimate your daily water intake based on body weight (35 ml/kg) and activity level. Get results in litres and cups. Runs entirely in your browser.
- Gestational Age CalculatorCalculate gestational age in weeks and days between the LMP and any chosen date. See total days elapsed and estimated trimester. Runs entirely in your browser.
- Ideal Weight CalculatorEstimate ideal body weight using the Devine, Robinson, Hamwi, and Miller formulas. Enter height and sex to see a range from four clinical equations.
- Macronutrient CalculatorSplit your daily calorie target into protein, carbohydrate, and fat grams using balanced, low-carb, or high-protein ratio presets. Instant results in your browser.
- Ovulation CalculatorFind your estimated ovulation day and fertile window from your LMP and cycle length. The fertile window spans 5 days before ovulation through 1 day after. Runs in your browser.
- Pregnancy Due Date CalculatorEstimate your baby’s due date using Naegele’s rule (LMP + 280 days) and see your current gestational week. Runs entirely in your browser.
- Sleep CalculatorFind the best bedtimes or wake-up times using 90-minute sleep cycles. Runs entirely in your browser — nothing is uploaded.
- Smoking Cost CalculatorCalculate how much you spend on cigarettes daily, monthly, yearly, and over 10 years. Currency-aware. Nothing is uploaded.
- TDEE CalculatorCalculate your Total Daily Energy Expenditure using the Mifflin-St Jeor formula. Enter sex, age, height, weight, and activity level to get BMR and TDEE in kcal.
- Waist-to-Hip Ratio CalculatorCalculate your waist-to-hip ratio and assess cardiovascular risk by sex. Enter waist and hip measurements to get your WHR and WHO risk category instantly in your browser.
Image 12
- Add Border to ImageAdd a colored border to any image instantly in your browser. Set width and color, then download as PNG — nothing is uploaded.
- Add Watermark to ImageAdd a text watermark to any image with custom position, opacity, and font size — all in your browser. Nothing is uploaded.
- Blur ImageBlur any image instantly in your browser. Adjust the blur radius with a slider and download the result as PNG — nothing is uploaded.
- Convert Image to GrayscaleConvert any image to grayscale or sepia instantly in your browser. Choose intensity and download the result — nothing is uploaded.
- Favicon GeneratorGenerate favicons in all standard sizes (16×16 to 512×512) from any image — instantly in your browser. Nothing is uploaded.
- Image Color PickerClick anywhere on an image to instantly pick the exact color — get HEX and RGB values. Runs entirely in your browser. Nothing is uploaded.
- Image CompressorCompress images in your browser with a quality slider. See before/after file size and download as JPEG or WebP. Nothing is uploaded.
- Image CropperCrop images in your browser by entering coordinates or using presets. Download the cropped result as PNG. Nothing is uploaded.
- Image ResizerResize images instantly in your browser. Set width, height, or both while keeping aspect ratio. Nothing is uploaded — 100% client-side.
- Image to Base64Convert any image to a Base64 data URL instantly in your browser. Get the CSS background-image snippet and see byte length. Nothing is uploaded.
- Rotate & Flip ImageRotate images 90, 180, or 270 degrees and flip horizontally or vertically — all in your browser. Nothing is uploaded.
- Round Image CornersRound the corners of any image instantly in your browser. Set the radius, download as PNG with transparent corners — nothing is uploaded.
Lifestyle 13
- Birthstone & Birth Flower FinderFind the birthstone and birth flower for any month of the year. Pick a month to see its gemstone and flower instantly — runs in your browser.
- Cat Age CalculatorConvert your cat’s age to human years with the standard vet chart. Find out how old your cat really is — runs entirely in your browser.
- Chinese Zodiac CalculatorFind your Chinese zodiac animal and element from your birth year. The 12-year cycle covers Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig.
- Cooking Measurement ConverterConvert cooking measurements instantly: cups, tablespoons, teaspoons, millilitres, fluid ounces, litres, grams, ounces, and pounds. All conversions run in your browser.
- Dog Age CalculatorConvert your dog’s age to human years by size class. Small, medium, large and giant breeds age differently — runs entirely in your browser.
- Fuel Cost CalculatorCalculate the total fuel cost of any trip. Enter distance, fuel efficiency (mpg, L/100km, or km/L), and local fuel price to get an instant estimate. Runs entirely in your browser.
- Life Path Number CalculatorCalculate your numerology life path number from your birth date. Master numbers 11, 22, and 33 are preserved.
- Love CalculatorA fun, deterministic love compatibility score for two names. Enter two names and get an instant love score. For entertainment only.
- Paint CalculatorCalculate how much paint you need for any room. Enter wall dimensions, subtract doors and windows, set coats and coverage — get litres or gallons needed plus number of cans.
- Recipe ScalerScale any recipe up or down instantly. Enter original and desired servings, paste your ingredient list, and get scaled quantities with clean fractions — all in your browser.
- Unit Price ComparisonCompare the price per unit of multiple products to find the best value. Enter price, quantity, and unit for each item — the cheapest is highlighted instantly. Currency-aware.
- Wedding Anniversary Gifts by YearLook up the traditional and modern wedding-anniversary gift for any year — 1st (paper) to 75th. Runs entirely in your browser.
- Zodiac Sign CalculatorFind your Western zodiac sign instantly from your birth month and day. Works for any year.
Math 18
- Circle CalculatorCalculate circle area, circumference, and diameter from radius instantly. Browser-only — nothing is uploaded.
- Distance Between Two PointsCalculate the Euclidean distance between two points and find the midpoint instantly in your browser. Enter coordinates and get results in real time.
- Exponent & Power CalculatorCalculate base^exponent and nth roots instantly. Handles negative and fractional exponents. Nothing is uploaded.
- Factorial CalculatorCalculate the factorial of any non-negative integer. Uses BigInt for exact large results. Runs entirely in your browser.
- Fraction to Decimal ConverterConvert fractions to decimals and decimals to fractions instantly. Fractions are reduced to lowest terms.
- GCD & LCM CalculatorCalculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two numbers or a list of numbers. Works entirely in your browser.
- Mean, Median, Mode CalculatorCalculate mean, median, mode, range, count, and sum from a list of numbers. Accepts comma, space, or newline separated values.
- Number to WordsConvert any integer — positive, negative, or with decimals — into English words. Supports numbers up to billions. Runs entirely in your browser.
- Percentage CalculatorCalculate percentages instantly in your browser: find X% of a number, what percent one number is of another, or the percent change between two values.
- Permutation & Combination CalculatorCalculate permutations nPr and combinations nCr instantly in your browser. Supports large numbers using BigInt — no rounding errors. Nothing is uploaded.
- Prime Number CheckerCheck whether a number is prime, get its prime factorization, and find the next prime. All calculations run locally in your browser.
- Quadratic Equation SolverSolve ax² + bx + c = 0 instantly. Returns real or complex roots and handles linear cases. Nothing is uploaded.
- Ratio CalculatorSimplify a ratio to its lowest terms using GCD, and solve a proportion A:B = C:x to find the missing value.
- Roman Numeral ConverterConvert integers to Roman numerals and Roman numerals back to integers. Supports values from 1 to 3999.
- Scientific Notation ConverterConvert between decimal notation and scientific notation (e.g. 0.00042 to 4.2 × 10⁻⁴). Returns both the standard e-notation and the Unicode display form. Runs in your browser.
- Slope CalculatorCalculate the slope, y-intercept, distance, and angle between two points instantly in your browser. Works for vertical lines too. Nothing is uploaded.
- Standard Deviation CalculatorCalculate population and sample standard deviation, variance, mean, count, and sum from a list of numbers. Accepts comma, space, or newline separated values.
- Triangle CalculatorCalculate triangle area and perimeter from three side lengths using Heron’s formula. Validates triangle inequality. Nothing is uploaded.
PDF 8
- Add Page Numbers to PDFStamp page numbers on every page of a PDF in your browser. Choose position, start number, and label style. Nothing is uploaded.
- Delete PDF PagesRemove specific pages from a PDF in your browser. Enter page numbers or ranges like 2,4-5 and download a clean copy. Nothing is uploaded.
- Extract PDF PagesKeep only the pages you want from a PDF right in your browser. Enter ranges like 1-3,5 and download instantly. Nothing is uploaded.
- Images to PDFConvert JPG and PNG images into a PDF in your browser. One image per page, instant download — nothing is uploaded.
- Merge PDFCombine multiple PDF files into one in your browser. Reorder and merge instantly — nothing is uploaded.
- Rotate PDFRotate all pages of a PDF 90, 180, or 270 degrees in your browser — nothing is uploaded.
- Split PDFExtract page ranges from a PDF into a new file in your browser. Enter ranges like 1-3,5 and download instantly. Nothing is uploaded.
- Watermark PDFAdd a diagonal text watermark to every page of a PDF in your browser. Adjust opacity and font size. Nothing is uploaded.
Security 3
- Credit Card ValidatorValidate credit card numbers with Luhn algorithm and detect card type (Visa, Mastercard, Amex, Discover) — all in your browser. Nothing is stored.
- Password Strength CheckerCheck how strong your password is — score, entropy bits, and improvement tips — all in your browser. Nothing is stored or transmitted.
- Text Encrypt / Decrypt (AES)Encrypt and decrypt text with AES-GCM and PBKDF2 key derivation — all in your browser. No data is uploaded or stored.
Text 23
- ASCII Art GeneratorConvert any image into ASCII art in your browser — adjust width and character set, then copy or download the text. Nothing is uploaded.
- Braille TranslatorTranslate text to Unicode Grade 1 (uncontracted) braille. Letters, numbers, and punctuation, all in your browser — nothing is uploaded.
- Caesar Cipher (incl. ROT13)Encode or decode text with a Caesar cipher (shift 1–25). ROT13 is shift 13. Letters wrap around; non-letters stay unchanged. Nothing is uploaded.
- Fancy Text GeneratorConvert plain text to fancy Unicode styles: 𝐛𝐨𝐥𝐝, 𝑖𝑡𝑎𝑙𝑖𝑐, 𝓼𝓬𝓻𝓲𝓹𝓽, 𝕕𝕠𝕦𝕓𝕝𝕖-𝕤𝕥𝕣𝕦𝕔𝕜, ᵗⁱⁿʸ, and more. Copy and paste into social media, bios, and messages. Nothing is uploaded.
- Find and Replace TextFind and replace text with support for case-insensitive, whole-word, and regex modes. Shows replacement count. Runs in your browser.
- Lorem Ipsum GeneratorGenerate placeholder lorem ipsum text by words, sentences, or paragraphs. Runs entirely in your browser — nothing is uploaded.
- Mirror TextReverse and mirror your text instantly. Simple reverse, mirror with substituted characters, or reverse word order. Copy-paste into social media, messages, and posts. Nothing is uploaded.
- Morse Code TranslatorTranslate text to Morse code and back instantly in your browser. Supports letters, digits, and spaces. Nothing is uploaded.
- NATO Phonetic Alphabet ConverterConvert any text to its NATO phonetic alphabet spelling (Alpha, Bravo, Charlie…). Digits are spelled out. Nothing is uploaded.
- Palindrome CheckerCheck whether any word, phrase, or sentence is a palindrome. Optionally ignore case and non-alphanumeric characters. Nothing is uploaded.
- Reading Time CalculatorEstimate how long text takes to read and to say aloud. Paste your text and pick a reading speed — runs entirely in your browser.
- Remove Extra SpacesClean up text by collapsing multiple spaces, trimming line ends, and removing blank lines. All processing runs locally in your browser.
- Remove Line BreaksRemove or replace line breaks in text. Replace with space or nothing, collapse multiple breaks, and optionally keep paragraph breaks.
- Reverse TextReverse text by characters, words, or lines instantly in your browser. Code-point aware so emoji and Unicode work correctly.
- Slug Generator (URL-friendly)Convert any text into a clean, URL-friendly slug. Strips diacritics, replaces spaces and special characters, and runs entirely in your browser.
- Sort & Dedupe LinesSort, reverse, or deduplicate lines of text instantly in your browser. Supports numeric sort, case-insensitive compare, trim, and blank-line removal. Nothing is uploaded.
- Strikethrough TextAdd strikethrough, underline, or slash overlay to any text using Unicode combining characters. Copy and paste into social media, messages, and documents. Nothing is uploaded.
- Text Case ConverterConvert text between uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and CONSTANT_CASE instantly in your browser. Nothing is uploaded.
- Text RepeaterRepeat any text up to 10,000 times with a custom separator in your browser. Results update instantly. Nothing is uploaded.
- Text to Binary ConverterConvert text to binary (8-bit per UTF-8 byte) or hex instantly in your browser. Paste binary back to decode it. Nothing is uploaded.
- Upside Down TextFlip your text upside down using Unicode character mappings. Perfect for social media bios, messages, and creative posts. Copy and paste anywhere. Nothing is uploaded.
- Word & Character CounterCount words, characters, sentences, paragraphs, lines, and estimated reading time instantly in your browser. Nothing is uploaded.
- Word Frequency CounterCount how often each word appears in your text. Results sorted by frequency, case-insensitive, punctuation stripped. Nothing is uploaded.
No tools match your search.