Online tools that just work — no sign-up, no fuss

Fast calculators, converters and generators, right in your browser. Free and nothing to install.

HealthBMI CalculatorCalculate your Body Mass Index from your weight and height, in metric or imperial units, and see which category you fall into.EducationPercentage CalculatorWork out percentages three ways: what X% of a value is, what one number is as a percentage of another, and the percentage change between two values.TextWord and Character CounterCount words, characters, sentences and paragraphs in any text in real time, with a reading-time estimate.ConvertersKilometers to Miles ConverterConvert kilometers to miles and miles to kilometers instantly, in both directions, with precision.GeneratorsSecure Password GeneratorCreate strong, random passwords with the length and character types you choose. Generated in your browser, never sent to a server.DevelopmentJSON Formatter and ValidatorFormat, indent and validate JSON in your browser. Points out the error with line and column when the text is invalid.DevelopmentBase64 Encoder and DecoderEncode text to Base64 or decode Base64 back to text, with full support for accents and emojis. Everything in your browser.GeneratorsQR Code GeneratorCreate a QR code from a link, text or Wi-Fi details and download the image as a PNG. Fast, free and in your browser.DevelopmentHash Generator (MD5, SHA-1, SHA-256, SHA-512)Generate the hash of any text in MD5, SHA-1, SHA-256 and SHA-512 at once. Computed in your browser.DevelopmentColor Converter (HEX, RGB and HSL)Convert colors between HEX, RGB and HSL, with a visual picker and preview. Edit any format and the others update instantly.DevelopmentUUID Generator (v4)Generate random UUIDs (version 4) one at a time or in bulk, ready to copy. Created securely in your browser.DevelopmentRegex TesterTest regular expressions in real time, with matches highlighted in the text and a match count.DevelopmentNumber Base ConverterConvert numbers between decimal, binary, hexadecimal and octal. Type in any base and the others update instantly.TextText Case ConverterTurn text into UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more, all at once.DevelopmentCSS, HTML and SQL FormatterMake CSS, HTML and SQL clean and readable with automatic indentation. Paste the code, pick the language and format.ConvertersTemperature ConverterConvert temperatures between Celsius, Fahrenheit and Kelvin. Type in any scale and the others update instantly.ConvertersUnit ConverterConvert units of weight, volume, area and speed at once. Enter a value and see the equivalent in every unit of the category.ConvertersTime Zone ConverterSee what time it is in cities around the world at once. Pick a date, time and reference zone and compare side by side.UtilitiesAge CalculatorFind out an exact age in years, months and days from a date of birth, plus the total number of days lived.UtilitiesDate CalculatorAdd or subtract days, weeks, months or years from a date and find the resulting date, with the weekday.FinanceCompound Interest CalculatorSee how an investment grows over time with compound interest and monthly contributions. Get the future value, total invested and interest earned.FinanceLoan Calculator (Fixed Payment and Constant Principal)Simulate loan payments with a fixed monthly payment or a constant-principal (decreasing) schedule, with the full amortization table and total interest.FinanceDiscount CalculatorFind the final price of a purchase after a discount and how much you save. Supports an extra coupon on top of the discount.HealthCalorie and BMR CalculatorEstimate your basal metabolic rate (BMR) and daily energy expenditure from age, weight, height and activity level.GeneratorsLorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text in the number of paragraphs you need, ready to copy into layouts and mockups.TextText Cleaner (Remove Accents and Duplicate Lines)Clean up text and lists: remove accents, duplicate lines, blank lines and extra spaces, and sort everything, in seconds.TextText Compare (Diff)Compare two texts and see exactly what changed, with additions and removals highlighted word by word.UtilitiesRandom PickerPick a name from a list, a number within a range, or flip a coin, with a fair, unbiased result.UtilitiesPomodoro TimerA focus-and-break timer using the Pomodoro method, with adjustable times and a sound alert at the end of each stage.UtilitiesPassword Strength CheckerFind out how strong a password is and get tips on what to improve. The assessment happens only in your browser.EducationProportion Calculator (Rule of Three)Solve direct proportions instantly: if A corresponds to B, find what C corresponds to. The classic rule of three, with the result as you type.FinanceSimple Interest CalculatorCalculate simple (non-compounding) interest: enter the principal, the rate and the time to see the interest earned and the final amount.UtilitiesTip & Bill Split CalculatorWork out the tip, the total, and how much each person pays when splitting the bill. Quick percentage presets included.HealthIdeal Weight CalculatorEstimate your ideal body weight from height and sex using four classic formulas (Devine, Robinson, Miller, Hamwi) plus the healthy BMI range.DevelopmentUnix Timestamp ConverterConvert Unix timestamps to human-readable dates (local, UTC, ISO 8601) and back — with a live current-epoch clock. Detects seconds vs. milliseconds automatically.DevelopmentSlug GeneratorTurn any title or phrase into a clean URL slug: lowercase, accents stripped, words joined by hyphens. Updates as you type.ConvertersRoman Numeral ConverterConvert numbers to Roman numerals and back (1 to 3999), with strict validation of the canonical form.GeneratorsRandom Team GeneratorPaste a list of names and split them into random, balanced teams — fair draws powered by cryptographic randomness.UtilitiesFuel Cost CalculatorEstimate how much a trip will cost in fuel: enter the distance, your car’s efficiency and the fuel price to get liters needed, cost per km and the total.ConvertersAspect Ratio CalculatorFind the aspect ratio of any width × height, and resize dimensions while keeping the proportion — perfect for video, images and screens.ConvertersImage Converter (PNG, JPG, WebP)Convert images between PNG, JPG and WebP with adjustable quality — entirely in your browser, nothing is uploaded anywhere.

Browse by category

Interest, discounts, loans and everyday money math.

BMI, calories, hydration and other wellness calculations.

Everyday math: percentages, averages, rule of three and more.

Count, clean, transform and organize text in seconds.

Tools for developers: JSON, Base64, hashes, regex and more.

Convert units of measurement precisely in one click.

Passwords, QR codes, test data and other handy generators.

Dates, random pickers, timers and everyday helpers.