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🗓Date CalculatorFree online tool to calculate days between two dates, add/subtract days, and count down to festivals. ⏱Unix Timestamp ConverterFree online Unix timestamp converter. Handles seconds, milliseconds and microseconds, and outputs local time, UTC and ISO 8601. 🎂Age CalculatorFree online age calculator with Chinese nominal age (xusui), Chinese zodiac, Western zodiac and days since birth. ⏳Countdown TimerFree online countdown: set a target date and time to see days, hours, minutes and seconds remaining in real time, with quick presets for common dates. 🌍Time Zone ConverterFree time zone converter: pick a source and target zone, enter a time, and see the converted time plus 24 major cities with local time and UTC offset. 📅Week Number CalculatorFree week number lookup: enter a date to get the ISO week and calendar week, the owning year, this week's start and end dates, and how far into the year you are. 📅Working Days CalculatorPick a date range to count total days, weekdays and weekend days, then adjust for public holidays and make-up work days. 🕰️Unix Timestamp ConverterConvert between timestamps and dates in both directions, with UTC, local time, zone offset, weekday, relative time and seven common formats at once.

🧮Mortgage Loan CalculatorFree online mortgage calculator with equal installment and equal principal methods, total interest and amortization schedule. 📈Compound Interest CalculatorFree compound interest calculator: enter principal, rate, years and compounding frequency to get the future value, total interest, effective annual rate and a year-by-year schedule. 🚗Car Loan CalculatorFree car loan calculator: enter price, down payment, term and rate to get the monthly instalment, total interest and a full amortisation schedule. 🧾China Income Tax CalculatorFree China income tax calculator: enter gross salary, social insurance and additional deductions to get monthly tax and net pay, plus a separate annual-bonus mode. 🏦Savings Interest CalculatorFree savings interest calculator: enter principal, annual rate and term to get interest earned, maturity value and the effective annual rate. 💱Currency ConverterFree currency converter for 20 popular currencies including CNY, USD, EUR, JPY and HKD, with live rates and a comparison table. 🧧Annual Bonus Tax CalculatorFree annual bonus tax comparison: enter your bonus and annual taxable salary to see whether separate taxation or merging saves more tax. 🏛️Social Insurance & Housing Fund CalculatorFree social insurance calculator: pick a city and enter your social insurance and housing fund bases to see the personal and employer contributions for pension, medical, unemployment, injury, maternity and the housing fund. 🏷️Discount CalculatorFree discount calculator: get the sale price, money saved and equivalent discount instantly, plus price-drop percentage and spend-threshold deal helpers. 🏠Loan Prepayment CalculatorFree loan prepayment calculator: enter your loan amount, rate and months paid to compare 'reduce payment' versus 'shorten term' and see how much interest each saves. 📈CAGR CalculatorEnter a starting value, an ending value and the number of years to get the compound annual growth rate, total return, growth multiple, years to double and a year-by-year projection.

⚖️BMI CalculatorFree BMI calculator: check whether your weight is underweight, normal, overweight or obese, and see the healthy range for your height. 🔥BMR CalculatorFree BMR and TDEE calculator using the Mifflin-St Jeor equation, with calorie targets for fat loss, maintenance and muscle gain plus a macro breakdown. 📏Body Fat CalculatorFree body fat calculator: enter height, weight, neck and waist (plus hip for women) to estimate body fat, fat mass and lean mass. 🤰Due Date CalculatorFree due date calculator: enter your last period or conception date to get the estimated due date, gestational age, trimester and key check-up dates. 🔥TDEE CalculatorFree TDEE calculator: estimate your BMR and total daily energy expenditure with the Mifflin-St Jeor formula, plus calorie and macronutrient targets for cutting, maintaining and bulking. ⚖️Ideal Weight CalculatorFree ideal weight calculator: use the healthy BMI range, the Devine formula and a simple formula to find your ideal weight and healthy weight range. 💧Daily Water Intake CalculatorFree daily water intake calculator: estimate how much water you should drink based on body weight, exercise and weather, with a cup conversion for easy tracking. 🏃Running Pace CalculatorDistance plus time gives pace, or pace gives you a finish time, along with speed, per-kilometre splits and Riegel equivalent predictions.

🔤Online Word CounterFree online word counter: total words, characters, Chinese and English counts, paragraphs, sentences and lines, plus word frequency analysis and reading time estimate. 🔠Case ConverterFree case converter: type text once and get six naming formats at once — uppercase, lowercase, Title Case, camelCase, snake_case and kebab-case. Click to copy. 🧹Text Dedupe & SortFree text dedupe and sort tool: remove duplicate lines, drop empty lines and trim whitespace in one click, with case-insensitive dedupe, ascending/descending sort, and a count of lines removed. 🔍Text Diff ToolFree online text diff: compare two passages line by line, mark added, removed and unchanged lines, and report counts plus a similarity score. 📝Markdown to HTMLPaste Markdown on the left, see it rendered instantly, and copy the clean HTML source underneath. 🔤Word Frequency CounterPaste text to get characters, characters without spaces, CJK characters, words, lines, sentences, plus a ranked word frequency table with percentages. 📃Placeholder Text GeneratorGenerate Lorem Ipsum or Chinese placeholder text by paragraph, sentence or word, with adjustable counts, reshuffling and a live word count. 🧷URL Slug GeneratorTurn any headline into a clean URL slug: strip accents and punctuation, collapse separators, keep or drop CJK, and cap the length. 🔀Line SorterFour sort modes and five cleanup switches — drop blanks, dedupe, trim, ignore case, reverse — all done in the browser. 💰RMB Amount in WordsConvert amounts to Chinese financial uppercase following accounting rules — zero handling, jiao/fen conventions and rounding — plus the value in fen. 🗣️Chinese to Pinyin3,755 common characters, with tone marks, plain pinyin or initials — polyphonic characters show every candidate reading. 🚿Whitespace CleanerEight switches you can combine: trim, collapse spaces, drop blank lines, tabs to spaces, strip BOM, CRLF to LF, single trailing newline. 🔃Text ReverserReverse all characters, the word order, the line order, or characters within each line — switch modes in real time. 📖Reading Time EstimatorCounts characters, words, sentences and paragraphs, then estimates reading and speaking time at 300 chars or 200 words per minute. ♻️Find and ReplaceFind and replace with regular expressions, ignore case, whole-word matching, and $1 $2 group references in the replacement. 🎰Random DrawDraw winners, shuffle a list, or draw without repeats — with weighted picks, all done locally. 🔀Simplified ⇄ Traditional ChineseTwo-way simplified / traditional Chinese conversion with phrase-level disambiguation for characters like 干杯, 头发 and 皇后. 🔢Line Number ToolAdd line numbers to multi-line text (custom start, step and zero-padding), or strip existing numbers automatically.

🔐Base64 Encoder & DecoderFree online Base64 encoder and decoder with correct UTF-8 Chinese support and URL-safe format option. 🔑Random Password GeneratorGenerate strong random passwords free, customize length and character sets, and check the strength of existing passwords. Everything runs locally. 🔗URL Encoder / DecoderFree URL encoder and decoder: component mode, whole-URL mode and form urlencoded mode, turning CJK and special characters into percent-encoding and back. 🆔UUID GeneratorFree UUID generator: create 1 to 100 UUID v4 values at once, with uppercase, hyphen-free and brace-wrapped options, using browser-grade cryptographic randomness. #️⃣Hash CalculatorFree hash calculator: compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 in one pass, UTF-8 aware for CJK text, all locally in your browser. 🎫JWT DecoderFree online JWT decoder: inspect the header and payload, see issued-at and expiry times plus validity status. Decoding is local, so your token never leaves the browser. 🧭URL ParserSplit any URL into scheme, host, port, path, fragment and query parameters, with automatic decoding and duplicate keys flagged. 🔣Base32 Encoder / DecoderConvert text to and from Base32 with the RFC 4648 alphabet, optional = padding stripped, and full UTF-8 support. 📡Morse Code ConverterEncode text to Morse or decode Morse back to text, covering letters, digits and common punctuation, with slashes between words. 🏺Caesar CipherShift the whole alphabet to encrypt or decrypt, 1 to 25, keeping case, with non-letters kept or blanked. 🔡Hex ConverterText to hex and hex back to text in UTF-8, with space separators or a 0x prefix.

🧾JSON FormatterFree online JSON formatter and minifier with 2/4 space or tab indentation. Syntax errors are reported with the exact line and column. Nothing is uploaded. 🧩Regex TesterFree online regex tester: live match highlighting, capture groups, replace preview and g/i/m flags — all running locally in your browser. ⏰Cron Expression ParserFree online cron parser: turn 'minute hour day month weekday' into plain English and list the next 5 run times. Supports */n steps, ranges and lists. 🗃SQL Formatter & MinifierFree online SQL formatter and minifier: uppercase keywords, clause breaks, nesting indentation, or collapse everything to one line — string literals are never mangled. 💠Code Formatter & MinifierFree online code formatter: beautify or minify HTML, CSS and JavaScript in one click, with script and style contents preserved verbatim. 🔄CSV ⇄ JSON ConverterFree online CSV ⇄ JSON converter: first row becomes the header, with quoted fields, escaped commas and embedded newlines supported, plus automatic number and boolean detection. 🏷Meta Tag GeneratorFree online meta tag generator: enter a title, description, URL and image to get copy-paste ready title, description, canonical, Open Graph and Twitter Card tags, plus length recommendations. 🛡️chmod CalculatorConvert between octal, symbolic and ls -l notation; tick the permission bits and get the chmod command, with setuid / setgid / sticky support. 🙈gitignore GeneratorTick your stack and OS, get a merged .gitignore in real time, sectioned by template and ready to download. 🚦HTTP Status Code ReferenceLook up a code, search by keyword, or filter by 1xx–5xx — each entry lists the Chinese and English names plus the RFC that defines it. 📋YAML and JSON ConverterConvert YAML to JSON and back, with 2 or 4 space indentation, comments and nested structures supported. 🧾XML FormatterBeautify XML indentation, minify whitespace, escape or unescape tag content, with live tag-pair validation.

🔳QR Code GeneratorGenerate QR codes from URLs or text online for free. Download as PNG. All data stays in your browser. 🗜Online Image CompressorCompress JPG, PNG and WebP images for free with adjustable quality and size. Everything happens in your browser — images are never uploaded. 📐Image ResizerFree online image resizer: set a target width and height or halve the size in one click, keep the original aspect ratio automatically, pick PNG/JPEG/WebP plus quality, and see the resulting byte size. 🔁Image ConverterFree online image format converter: switch between PNG, JPEG and WebP with a quality setting, compare file sizes before and after, keep the original dimensions, all processed locally. 🧬Image to Base64Free online image to Base64 converter: turn a file or pasted data URL into Base64, optionally strip the data: prefix or wrap at 76 characters, with image type and original byte size shown. 💧Image WatermarkFree online image watermarking: set the text, size, colour, opacity and one of nine positions, with a thin outline that stays readable on light or dark photos, then download as PNG. 🖼Placeholder Image GeneratorFree online placeholder generator: set width, height, background, text and text colour to get a vector SVG that is only a few hundred bytes — download it or copy the source. ✂️Image CropperLoad an image, drag a box on the preview or type exact coordinates, lock to 1:1, 4:3 or 16:9, and export as PNG. 🎨Image Color PickerOpen an image, click any pixel to get HEX, RGB and HSL, and see the dominant colours of the whole picture ranked by share. 🌀Rotate and Flip ImagesRotate by 90, 180 or 270 degrees, mirror horizontally or vertically, stack them, download the result. 🎞️Image CollageArrange multiple images into a grid with your own column count, gap and background, then export.

🎨Color ConverterFree color converter: enter a HEX value and instantly get RGB, HSL, HSV and CMYK, with a visual picker and live preview. 🧿Contrast CheckerFree contrast checker: enter a foreground and background colour to compute the WCAG 2.1 ratio, see AA/AAA pass or fail, and preview real text. 🌈Color Palette GeneratorFree palette generator: enter one base colour and get six professional schemes — complementary, analogous, triadic, split, tetradic and monochrome. Click any swatch to copy its HEX. 🖌️CSS Gradient GeneratorDrag stops and set the angle to see the gradient live, then copy CSS you can paste straight into a stylesheet. Linear, radial and conic are all supported. 🪞CSS Box Shadow GeneratorTune offsets, blur, spread and opacity to see the shadow live, then copy ready-to-use box-shadow CSS. Switch between outer and inset in one click. 🔲CSS Border Radius GeneratorSet each corner separately or link all four, in px or percent, with automatic CSS shorthand and a live preview. 🫧Glassmorphism CSS GeneratorTune blur, saturation, opacity, radius and shadow, preview live and copy the CSS. 👁Colour Blindness SimulatorOriginal and simulation side by side — protanopia, deuteranopia, tritanopia and achromatopsia, with adjustable strength.

🔄Online Unit ConverterFree online unit converter covering 8 categories and 50+ units: length, weight, temperature, area, volume, speed, data storage and time. 📊Percentage CalculatorFree percentage calculator: find X% of a number, work out what percent one value is of another, and calculate percent increase or decrease with the formula shown. 🔢Base ConverterFree online base converter between binary, octal, decimal, hex and base 36. Accepts 0x / 0b / 0o prefixes and uses BigInt, so huge integers keep full precision. 📊Statistics CalculatorFree online statistics calculator: count, sum, mean, median, mode, population and sample standard deviation, range, min and max in one pass. 🎲Random Number GeneratorFree online random number generator: set min, max and count to produce integers, unique draws or decimals with a fixed precision, powered by a cryptographic source for draws and codes. 🔢GCD and LCM CalculatorEnter any number of integers to get the greatest common divisor, the least common multiple and the prime factorisation of each number in one pass. 🧮Fraction CalculatorAdd, subtract, multiply or divide two fractions and get the simplest form plus the mixed number, decimal, percentage and full working. 🎯Rounding CalculatorExact decimal rounding across six modes — half up, banker's, ceiling, floor, toward zero and away from zero — with differences. 📉Percentile CalculatorFrom one dataset: any percentile, the common ones, a full table, and the rank of a specific value. ⅫRoman Numeral ConverterConvert both ways from 1 to 3999, recognising all four subtractive forms, plus the symbol sum and length. 🧱Area and Volume ConverterConvert between area and volume units — m², mu, hectare, acre, ft², litres, gallons and more. 🧮Scientific Notation ConverterConvert between ordinary numbers and scientific notation, with significant-digit control and exact expansion for huge and tiny values. ⚖️Equation SolverSolve linear and quadratic equations, systems of two linear equations and proportions, with discriminants and exact fractions.