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Every everyday tool, under one roof.
45 free calculators, converters, text, image and developer tools. Press / to search.
Calculators
๐งฎScientific CalculatorArithmetic, trigonometry, logs, powers and factorials with history.๏ผ
Percentage CalculatorX% of Y, what percent, and percentage change.โ๏ธBMI & Body CalculatorBody mass index, healthy weight range and daily calorie estimate.๐ฝ๏ธTip & Bill SplitterWork out the tip and what each person owes.๐ท๏ธDiscount & Sales TaxFinal price after a discount (or two) plus tax/VAT.๐Age CalculatorExact age in years, months and days, plus days to next birthday.๐
Date CalculatorDays between two dates (incl. working days) and add/subtract days.๐GPA / CGPA CalculatorWeighted GPA from courses, credits and grades (4.0 scale).๐Statistics CalculatorMean, median, mode, range, standard deviation and more from a list of numbers.โฝFuel & Trip CostEstimate fuel needed and trip cost from distance and mileage.๐Zakat CalculatorWork out Zakat (2.5%) on cash, gold, silver, investments and business assets against the nisab.๐ฏSavings Goal PlannerHow much to put aside each month to reach a goal by a date โ or how long it will take.
Converters
๐Unit ConverterLength, weight, temperature, area, volume, speed, data, energy and more.๐ขNumber Base ConverterConvert between binary, octal, decimal, hexadecimal and any base 2โ36.โ
ซRoman NumeralsConvert numbers to Roman numerals and back.๐คNumber to WordsWrite any number in English words โ handy for cheques and invoices.๐Time Zone ConverterSee a date & time across multiple cities and time zones.
Text & Writing
โ๏ธSpell CheckerFind misspelled words, click to pick a suggestion, or fix all at once.๐Word Counter & ReadabilityWords, characters, sentences, reading time, readability grade and keyword density.AaCase ConverterUPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case and more.โText Compare (Diff)Compare two texts line by line and highlight additions and removals.โ๏ธMarkdown EditorWrite Markdown with a live preview; export as HTML.๐งนText Cleaner & SorterSort, dedupe, trim, number, reverse or shuffle lines; strip extra spaces.๐Find & ReplaceFind and replace across text, with case and regex options.๐Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences or words.
Image & Color
๐ผ๏ธImage Editor & ConverterResize, crop, rotate, compress, apply filters and convert between JPG, PNG, WebP, AVIF, GIF.๐Image Info & Base64Dimensions, format, size and dominant colour โ plus a Base64 data URI.๐จColor Picker & PalettePick a colour, convert HEX/RGB/HSL, and generate shades and harmonies.โContrast CheckerCheck text/background colour contrast against WCAG AA and AAA.โฆQR Code GeneratorMake QR codes for links, text, Wi-Fi, email, phone or contacts. Download PNG or SVG.
Developer
{ }JSON Formatter & ValidatorValidate, pretty-print, minify and sort JSON โ with the exact error position.โCSV โ JSON ConverterConvert CSV to JSON and JSON to CSV, with a table preview.๐กBase64 Encode / DecodeEncode or decode Base64 text (UTF-8 safe, URL-safe option).๐URL Encoder & ParserEncode/decode URLs and break a URL into its parts and query parameters.#๏ธโฃHash GeneratorMD5, SHA-1, SHA-256, SHA-512 and HMAC for text or files (checksum verify).๐Password GeneratorStrong random passwords (server-side crypto), plus a strength checker.๐UUID GeneratorGenerate random v4 UUIDs in bulk..*Regex TesterTest regular expressions with live highlighting and capture groups.๐ซJWT DecoderDecode a JSON Web Token header and payload and check expiry.โฑ๏ธUnix Timestamp ConverterConvert Unix timestamps to human dates and back; see the current epoch live.
Productivity & Fun
๐๏ธNotesPrivate notes saved on the server โ only this browser can see them.โ
To-Do ListA simple checklist that remembers your tasks in this browser.โฒ๏ธStopwatch & TimerA stopwatch with laps and a countdown timer with an alarm.๐
Pomodoro Focus TimerWork in focused sprints with automatic short and long breaks.๐ฒRandom Picker & DiceRandom numbers, dice, coin flips, and pick names or teams from a list.