Tooooly

Fast, private tools that run right in your browser.

⭐ Favorites

Network

🌐Subnet CalculatorCalculate IPv4 subnets, masks and host ranges, split blocks (VLSM), and see the network at the bit level.

🔎DNS LookupLook up DNS records (A, AAAA, CNAME, MX, TXT, NS, CAA) for any domain, or resolve a dynamic-DNS hostname to its current IP.

📍What Is My IPSee your public IP plus country, city, ASN and network — read at the edge, never stored.

🧮IP Address ConverterConvert an IPv4 address to its decimal, binary and hexadecimal forms and back, in your browser.

🌐IPv6 Expand / CompressExpand an IPv6 address to its full form or compress it with :: notation, both ways in your browser.

🌍URL ParserParse any URL into protocol, host, port, path, query parameters and hash, instantly in your browser.

🕵️User-Agent ParserSee your own user-agent and parse any UA string into OS, browser, engine and device type.

🔐chmod CalculatorConvert Unix file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x) — kept in sync.

🔌MAC Address FormatterReformat a MAC address into colon, hyphen, Cisco dot and bare forms in upper or lower case.

Converters

📐Unit ConverterInstantly convert length, mass, temperature, data and speed. Accurate, fast and easy to read.

🕒Timestamp ConverterConvert Unix timestamps to human dates (UTC, local, ISO) and back.

🔢Number Base ConverterConvert numbers between binary, octal, decimal and hexadecimal, live.

🎨Color ConverterPick a color and convert between HEX, RGB and HSL instantly.

🔀JSON ⇄ CSVConvert a JSON array to CSV and CSV back to JSON, with selectable delimiters, in your browser.

⏰Cron ParserParse a cron expression into a plain-language schedule and field breakdown, in your browser.

🏛️Roman NumeralsConvert numbers to Roman numerals and back, instantly in your browser.

💾Data Size ConverterConvert data sizes between bytes, KB, MB, GB and more, in both SI and IEC units.

💯Percentage CalculatorCalculate percentages: X% of Y, what percent X is of Y, and percent increase or decrease.

📅Date DifferenceFind the difference between two dates in years, months, weeks and days — and calculate age.

🌗Contrast CheckerCheck the WCAG contrast ratio between two colors and see AA/AAA pass or fail, in your browser.

📐Aspect Ratio CalculatorCalculate aspect ratios and the missing width or height while keeping the proportion, in your browser.

🕐Timezone ConverterConvert a date and time between timezones around the world, using your browser and the IANA database.

🔤Number to WordsSpell out any number in English words (e.g. 1234 → one thousand two hundred thirty-four), in your browser.

🔟Text to BinaryConvert text to binary and back. See UTF-8 bytes as binary, decimal and hex, or decode 8-bit groups into text. Fast, free and fully private.

📐CSS Unit ConverterConvert between px, rem, em, pt and % for any root font-size. Enter a value and every unit updates live, then copy any result with its unit.

📆Business Days CalculatorCount the working days (Mon–Fri) between two dates, or add business days to a date, excluding weekends and your own holiday list — in your browser.

⏳Event CountdownLive countdown to any date and time, showing days, hours, minutes and seconds and updating every second — right in your browser.

⏱️Time Duration CalculatorAdd or subtract durations in HH:MM:SS, and find the difference between two clock times. Get a normalized result plus total minutes and seconds.

🗓️Week Number (ISO)Find the ISO-8601 week number, ISO year and weekday for any date, see the current week, and look up the Mon–Sun dates for a given year and week.

👟Shoe Size ConverterConvert shoe sizes between US, UK, EU and JP (cm) for men and women — enter your size in one system and see the rest, with a full chart.

⛽Fuel Economy ConverterConvert fuel economy between US mpg, UK (imperial) mpg, L/100km and km/L — enter one and see all the others instantly, in your browser.

🔄JSON ⇄ YAMLConvert JSON to YAML and YAML to JSON in your browser — paste, switch direction, and copy. Nothing is uploaded.

Generators

🔳QR Code GeneratorCreate QR codes for links, text and more. Customize colors and size, then download as PNG or SVG — all in your browser.

#️⃣Hash GeneratorGenerate SHA-1, SHA-256, SHA-384 and SHA-512 hashes in your browser.

🔑Password GeneratorGenerate strong, random passwords with crypto-secure randomness. Nothing leaves your browser.

🆔UUID GeneratorGenerate random UUID v4 identifiers in your browser. Copy one or many.

🎲Random Number GeneratorGenerate cryptographically secure random numbers, dice rolls, and coin flips in your browser with custom range and count.

🌈CSS Gradient GeneratorCreate linear and radial CSS gradients with a live preview and copy the ready-to-use background code.

🔲CSS Box-Shadow GeneratorVisually build CSS box-shadow effects with offset, blur, spread, color, and inset controls, then copy the code.

🔡Random String GeneratorGenerate cryptographically secure random strings and tokens with custom length and character sets, all in your browser.

🛡️Password Strength CheckerCheck password strength with an entropy estimate and crack-time — entirely in your browser, never sent anywhere.

🔑HMAC GeneratorGenerate an HMAC for any message and secret key using SHA-1, SHA-256, SHA-384 or SHA-512. Output in hex or Base64 — computed entirely in your browser.

🆔NanoID & ULID GeneratorGenerate cryptographically random NanoIDs (21 URL-safe characters) and ULIDs (26 characters, time-sortable). Choose how many and copy each or all at once.

🔗UTM BuilderBuild properly encoded UTM campaign links with source, medium, campaign, term and content — in your browser.

🖼️Open Graph PreviewPreview your social share card and generate Open Graph and Twitter Card meta tags from your own values — in your browser.

▌▌Barcode GeneratorGenerate barcodes in CODE128, EAN-13, UPC, CODE39 or ITF-14 formats. Type a value, toggle the caption, and download as SVG or PNG — created entirely in your browser.

Text

🔤Character CounterCount characters, words, lines, sentences and bytes as you type.

AaCase ConverterConvert text to UPPER, lower, Title, camelCase, snake_case, kebab-case and more.

🔡Base64 Encode / DecodeEncode or decode Base64 text, UTF-8 safe — entirely in your browser.

{ }JSON FormatterFormat, validate and minify JSON with clear error messages. Client-side.

🔗URL Encode / DecodePercent-encode or decode URLs and query strings — entirely in your browser.

🔑JWT DecoderDecode a JWT header and payload in your browser. No data leaves your device.

🧪Regex TesterTest regular expressions with live match highlighting, in your browser.

📝Markdown PreviewWrite Markdown and see a live preview side-by-side, fully in your browser.

🆚Text DiffCompare two blocks of text and highlight added and removed lines instantly, entirely in your browser.

📄Lorem Ipsum GeneratorGenerate Lorem Ipsum placeholder text by paragraphs, sentences or words, then copy it with one click.

🗂️Sort & Dedupe LinesSort lines alphabetically or numerically, remove duplicates and blank lines, and trim whitespace — all in your browser.

🔁Find & ReplaceFind and replace text with optional regex and case-insensitive matching, entirely in your browser.

🔣HTML EntitiesEncode text to HTML entities or decode them back, safely in your browser.

📻Morse Code TranslatorTranslate text to Morse code and back, with optional audio playback, in your browser.

📟Base32 Encode / DecodeEncode text to Base32 or decode it back (RFC 4648), entirely in your browser.

🈁Full-width ⇄ Half-widthConvert between full-width (全角) and half-width (半角) letters, digits and katakana, in your browser.

🐌SlugifyTurn any text into a clean URL slug — lowercase, hyphenated and accent-stripped — in your browser.

🔡Caesar CipherEncode or decode text with a Caesar shift cipher (0–25), or apply ROT13 in one click. Letters shift while case, spaces and punctuation stay intact.

📋Markdown Table GeneratorPaste CSV or TSV and get a GitHub-flavored Markdown table with header and column-alignment options, plus a live preview. Copy it in one click.

🐦Tweet SplitterSplit long text into posts under a character limit (default 280), breaking on word boundaries. Optionally add (1/n) numbering and copy each part.

📱Instagram Line BreakAdd line breaks and blank lines to Instagram captions that survive posting, using an invisible character — in your browser.

🗄️SQL FormatterFormat and beautify SQL queries for PostgreSQL, MySQL, SQLite, BigQuery and standard SQL. Choose your indent, paste, and copy clean SQL — all in your browser.

🎨CSS FormatterBeautify CSS with clean indentation or minify it to the smallest size. Paste your stylesheet, switch between beautify and minify, and copy the result — fully in your browser.

📄HTML FormatterBeautify messy HTML with proper indentation or minify it by removing comments and extra whitespace. Paste, toggle beautify or minify, and copy — entirely in your browser.

✨JavaScript BeautifierBeautify and format minified or messy JavaScript with readable indentation. Choose 2 spaces, 4 spaces or tabs, paste your code, and copy clean JS — all in your browser.

Music

🎵MetronomeA precise online metronome with adjustable tempo, time signature and accent on beat 1.

👆BPM TapperTap along to any song to find its tempo in BPM. Tap the button or the spacebar.

🎚️Delay Time CalculatorConvert BPM to delay/reverb times in ms for every note value — straight, dotted and triplet.

🎸TunerTune any instrument with your mic. Real-time pitch & cents — all in your browser.

🎹Chord FinderLook up any chord: see its notes on a piano and hear it play.

🎼Scale FinderExplore scales and modes: see the notes on a piano and hear them play.

🎶Note ⇄ FrequencyConvert musical note names to frequency in Hz and back, with adjustable A4 tuning.

🎚️Chord TransposerTranspose chord progressions up or down by semitones, preserving chord types, in your browser.

🎸Guitar & Ukulele ChordsLook up guitar and ukulele chord shapes with clear fretboard fingering diagrams, in your browser.

⭕Circle of FifthsExplore the circle of fifths interactively: key signatures, relative minors and neighbouring keys.

🎻Interval CalculatorFind the interval between two notes — its name and semitone count — or get the note a given interval away.

🪕Capo CalculatorWork out which chord shapes to play with a capo, or find the best capo position for an easier key.

🎚️Drone GeneratorPlay a clean sustained drone tone for tuning and practice. Pick a note and octave or a raw frequency, choose a waveform, set the volume — click-free start and stop.

🎼Chord ProgressionPick a key and major/minor mode to see the diatonic chords (I–vii) and play common progressions like I–V–vi–IV, ii–V–I and the 12-bar blues — right in your browser.

👂Ear TrainingTrain your ear: a random interval or chord plays, you guess from the buttons, and your score is tracked. Replay any time — runs entirely in your browser.

Image

🖼Image ConverterConvert images between PNG, JPEG and WEBP. Entirely in your browser — no upload.

📐Image ResizerResize and compress images to any size. Entirely in your browser — no upload.

✂️Image Crop & RotateCrop, rotate and flip images right in your browser and download the result — never uploaded.

🧹EXIF RemoverRemove EXIF and metadata (GPS location, camera info) from images in your browser — a privacy win.

🧾Image to Base64Encode an image to a Base64 data URI (with ready img and CSS snippets) or decode one back, in your browser.

⭐Favicon GeneratorGenerate favicons at every standard size from one image, plus the HTML link tags — all in your browser.

🗜️Image CompressorCompress JPEG and WebP images with an adjustable quality slider. See the file-size savings and download — all in your browser, never uploaded.

💧Image WatermarkOverlay a text watermark on any image: choose position, font size, color and opacity, preview live and download. Everything stays in your browser.

😂Meme GeneratorMake classic memes with bold Impact-style top and bottom captions and a black outline. Live preview and one-click download — fully in your browser.

🖼️Dummy Image GeneratorCreate placeholder images up to 4000×4000 px with custom colors, label text and format (PNG/JPEG/WebP) — rendered locally, download or copy as data URL.

PDF

🔗Merge PDFCombine several PDF files into one in the order you choose, then download. Files are merged right in your browser and never uploaded.

✂️Split PDFExtract a page range like 1-3, 5 from any PDF into a new file and download it. Runs entirely in your browser — your PDF is never uploaded.

🔄Rotate PDFRotate all pages or a chosen range by 90, 180 or 270 degrees and download the fixed PDF. Everything happens in your browser — nothing is uploaded.

🖼️Images to PDFCombine multiple JPG and PNG images into a single PDF, one image per page, then download. Converted in your browser — your images never leave your device.

#️⃣PDF Page NumbersStamp page numbers onto a PDF with a choice of position, starting number and font size, then download. Done in your browser — your file is never uploaded.

💧PDF WatermarkStamp a diagonal text watermark across every page of a PDF with custom text, size, color and opacity, then download. Applied in your browser, never uploaded.

🖼️PDF to ImagesConvert each page of a PDF into a PNG or JPG image at a resolution you choose. Preview thumbnails, then download pages individually or all at once — 100% in your browser, nothing uploaded.

📝PDF Text ExtractorPull selectable text from every page of a PDF, or just a page range, with clear page separators. Copy it to your clipboard or download it as a .txt file — all in your browser. Scanned, image-only PDFs hold no extractable text.

📐Graph Paper PDFGenerate printable graph paper as a PDF: square grid, dot grid or isometric triangles, 2–10 mm spacing, A4 or US Letter — all in your browser.

📃Lined Paper PDFGenerate printable lined paper as a PDF: ruled paper with 6–10 mm spacing, blank music staff sheets, or 3-line handwriting practice paper — all in your browser.

🗓️Calendar PDFCreate a printable monthly calendar PDF for any month and year: Monday or Sunday week start, optional notes area, A4 or US Letter — generated in your browser.

✅Habit Tracker PDFBuild a printable monthly habit tracker PDF: enter up to 15 habits and get a tick-box grid for every day of the month, with weekends shaded — generated in your browser.

Design

🎨Color Palette ExtractorUpload an image to extract its dominant colors as a palette of HEX codes — fast, free and 100% in your browser.

👁Color Blindness SimulatorSimulate protanopia, deuteranopia, tritanopia and achromatopsia on any image or color to check accessibility — all in your browser.

🌈Color Harmony GeneratorPick a base color to instantly generate complementary, analogous, triadic, tetradic, split-complementary and monochromatic palettes with copyable HEX codes.

🖨️CMYK ConverterConvert colors between CMYK, RGB, HEX and HSL for print and web design, instantly in your browser.

🏷️Color Name FinderEnter a HEX or RGB color to find its nearest named color, with close alternatives — all in your browser.

👾ASCII Art GeneratorTurn any image into ASCII art with adjustable width, then copy it — processed entirely in your browser.

⬜Border Radius GeneratorVisually craft CSS border-radius with four corner sliders, px or %, and elliptical corners — live preview and copy-ready code, in your browser.

〰️Cubic Bezier EditorDesign CSS easing curves with draggable control points, preview the animation and copy the cubic-bezier() value. Presets included, in your browser.

🧊Glassmorphism GeneratorCreate frosted-glass (glassmorphism) cards with sliders for blur, transparency, saturation, border and radius — live preview and CSS, in your browser.

Calculators

📐Scale CalculatorConvert between real-world and drawing dimensions at any scale (1:50, 1:100, custom) for architecture and models.

📏Feet & Inches CalculatorAdd, subtract and convert feet and inches with fractions, and switch to centimetres or metres — in your browser.

🏠Roof Pitch CalculatorConvert roof pitch between rise/run, degrees, percentage and x-in-12 — handy for roofing and construction.

🪜Stair CalculatorCalculate the number of steps, riser height, tread depth and total run from a total rise, with comfort checks.

🔺Triangle SolverSolve any triangle from its known sides and angles (Pythagoras, law of sines and cosines) and get the area.

🧮Scientific CalculatorA full scientific calculator with trigonometry, logarithms, powers, roots and constants — runs in your browser.

📊Statistics CalculatorGet mean, median, mode, range, variance, standard deviation and quartiles from a list of numbers, instantly.

🎓GPA CalculatorAdd your courses, grades and credit hours to calculate your weighted GPA on a 4.0 scale — in your browser.

📈Quadratic Equation SolverSolve ax²+bx+c=0 for real or complex roots, with the discriminant, vertex and axis of symmetry.

➗Fraction CalculatorAdd, subtract, multiply and divide fractions, simplify them, and convert to mixed numbers or decimals.

#️⃣GCD & LCM CalculatorFind the greatest common divisor and least common multiple of several integers, with the Euclidean steps.

🏷️Unit Price CalculatorCompare up to three products by price per unit and instantly see which is the best value. Enter each price, quantity and unit — the cheapest is highlighted.

➗Ratio CalculatorSimplify ratios like a:b or a:b:c to their lowest terms with the GCD, and solve proportions a:b = c:x for the missing value. Decimals are supported.

🔢Permutations & CombinationsCompute permutations nPr and combinations nCr from n and r, with the factorial formulas shown. Exact whole-number results, even for large n.

🧮Prime FactorizationBreak any positive integer into its prime factors in exponent form (e.g. 360 = 2³ × 3² × 5), count its divisors, list them, and test whether the number is prime.

📋Sample Size CalculatorFind how many survey responses you need from confidence level, margin of error and population size, with finite-population correction.

🧪A/B Test Significance CalculatorCheck whether your A/B test result is statistically significant: conversion rates, uplift, z-score, p-value and a plain-language verdict.

🔗Correlation CalculatorPaste paired data to get Pearson r, r², Spearman rho and covariance, with a scatter plot and plain-language interpretation.

📐t-Test CalculatorRun a Welch two-sample or one-sample t-test: means, standard deviations, t statistic, degrees of freedom, exact two-tailed p-value and Cohen’s d.

Science

🎛️Resistor Color CodeDecode 4, 5 and 6-band resistor color codes into resistance and tolerance — essential for electronics projects.

⚡Ohm's Law CalculatorEnter any two of voltage, current, resistance or power to instantly get the rest, with the formulas used.

⚗️Molar Mass CalculatorEnter a chemical formula like Ca(OH)2 to compute its molar mass with a per-element breakdown — in your browser.

⚛️Periodic TableExplore all 118 elements in an interactive periodic table — tap any element for its symbol, number and atomic mass.

Study

🍅Pomodoro TimerA Pomodoro timer with custom focus and break lengths, auto-advancing phases and a chime — all in your browser.

⌨️Typing Speed TestMeasure your typing speed in WPM with live accuracy and per-character feedback. Restart for a new sample anytime.

📚Citation GeneratorGenerate citations for websites, books and journal articles in APA, MLA and Chicago — formatted instantly in your browser.

📖Readability CheckerCheck English readability with Flesch Reading Ease and Flesch–Kincaid grade, plus word, sentence and syllable stats.

🎓Grade CalculatorCalculate your weighted course grade, or the score you need on the final exam to hit a target — in your browser.

🎓Hensachi CalculatorCalculate hensachi (Japanese standardized score: 50 = average, 10 points = 1 SD) from your score, mean and SD — or from a pasted list of all scores — with percentile and rank.

Health

⚖️BMI CalculatorCalculate your Body Mass Index from height and weight (metric or imperial) and see your category — in your browser.

🔥Calorie CalculatorEstimate your BMR and daily calorie needs (TDEE) from age, sex, size and activity, with goals to lose, maintain or gain.

📉Body Fat CalculatorEstimate your body-fat percentage with the U.S. Navy tape method from a few measurements — in your browser.

🎯Ideal Weight CalculatorFind your ideal body weight from height and sex using common formulas, plus a healthy BMI range — in your browser.

💧Water Intake CalculatorEstimate how much water to drink each day from your weight and activity, shown in litres and cups — in your browser.

🏃Running Pace CalculatorWork out pace, time or distance for your runs (km or miles) and see your splits — in your browser.

❤️Heart Rate ZonesCalculate your max heart rate and training zones 1–5 from age (and optional resting HR) — in your browser.

🏋️One-Rep Max CalculatorEstimate your one-rep max from weight and reps, with a percentage table for training — in your browser.

😴Sleep CalculatorFind ideal bedtimes or wake times based on ~90-minute sleep cycles — in your browser.

🤰Due Date CalculatorEstimate your due date from your last period or conception date, with gestational age and trimester — in your browser.

🍗Macro CalculatorSplit your daily calories into grams of protein, carbs and fat from a preset or custom ratio — in your browser.

🍶Pure Alcohol IntakeAdd up the grams of pure alcohol in your drinks and compare with health guidelines — computed locally. Never a tool for judging driving: the only safe amount before driving is zero.

💄Cosmetics Expiry (PAO)Find out when an opened mascara, foundation or sunscreen should be replaced, from typical period-after-opening guidelines — in your browser.

Finance

🏦Loan CalculatorCalculate the monthly payment, total interest and total cost of a loan or mortgage — in your browser.

💹Compound Interest CalculatorSee how savings grow with compound interest and regular contributions, with a breakdown — in your browser.

🍽️Tip CalculatorWork out the tip and total, and split the bill between any number of people — in your browser.

🔖Discount CalculatorFind the final price and how much you save from a percentage discount, including stacked discounts — in your browser.

🧾Sales Tax CalculatorAdd or remove sales tax or VAT at any rate, showing net, tax and gross — in your browser.

💵Salary ConverterConvert pay between hourly, daily, weekly, monthly and annual based on your work schedule — in your browser.

🐷Savings Goal CalculatorSee how long to reach a savings goal — or how much to save monthly — given a target and interest rate, in your browser.

📈ROI CalculatorCalculate return on investment, net profit and annualized return from initial and final values — in your browser.

📊Margin & Markup CalculatorTurn cost and price into profit, margin % and markup % — and work backwards from a target margin to the price you need. See clearly why margin ≠ markup.

💰50/30/20 Budget CalculatorSplit your monthly after-tax income into 50% needs, 30% wants and 20% savings — and adjust the percentages to fit your own plan, with live amounts.

📈Inflation CalculatorSee what a dollar amount from one year is worth in another using bundled US CPI-U annual averages (1913–2024), with the total percentage change and annualized rate.

Cooking

🥄Cooking ConverterConvert cooking measurements between cups, grams, ml and more — including by ingredient — in your browser.

🌡️Oven Temperature ConverterConvert oven temperatures between Celsius, Fahrenheit and gas mark, with a reference table — in your browser.

🧁Recipe ScalerScale a recipe up or down by servings and get the adjusted ingredient amounts — in your browser.

🍰Baking Pan ConverterCompare baking pan sizes by area and get a scaling factor when swapping pans — in your browser.

⏲️Kitchen TimerA simple kitchen countdown timer with quick presets and a beep when time is up — in your browser.

🍚Rice CalculatorConvert rice between gō, grams, millilitres, cooked weight and servings — with the right amount of water — in your browser.

☕Coffee RatioDial in your brew: enter coffee grams or water millilitres and get the other at 1:15, 1:16, 1:17 or a custom ratio — in your browser.

🥖Baker's PercentageTurn baker's percentages into gram weights (flour = 100%), or scale a formula to a target dough weight — hydration included, in your browser.

🧂Brine CalculatorWork out exactly how much salt you need for a simple or equilibrium brine at any percentage — pickles, sauerkraut, poultry — in your browser.

🍺ABV CalculatorCalculate alcohol by volume and attenuation from original and final gravity, with a Plato ⇄ SG helper — for homebrewing, in your browser.

Fun

🎰Random PickerPaste a list and let it randomly pick one — great for decisions and giveaways — in your browser.

👥Team GeneratorPaste names and randomly split them into balanced teams (by count or size), with reshuffle — in your browser.

✨Fancy Text GeneratorTurn your text into bold, italic, monospace and other Unicode styles for bios and posts — copy with one tap, in your browser.

🙃Upside Down TextFlip your text upside down (ʇxǝʇ uʍop ǝpᴉsdn) and copy it for fun posts and usernames — in your browser.

🎙️NATO Phonetic AlphabetConvert text to the NATO phonetic alphabet (Alfa, Bravo, Charlie…) and back — in your browser.

#️⃣Hashtag GeneratorTurn words and phrases into clean hashtags (camelCase or lowercase) for social posts — copy the block, in your browser.

🎲Dice RollerRoll virtual dice (d4, d6, d8, d10, d12, d20, d100): pick how many and see each result plus the total. Crypto-fair, in your browser.

🪙Coin FlipFlip a coin online — one big heads-or-tails result, or flip up to 100 at once and see the counts and sequence. Crypto-fair, in your browser.

🎡Spinner WheelAdd names, spin a colorful wheel and let it land on a random winner — remove the winner and spin again. Crypto-fair, in your browser.

❓Yes or NoCan’t decide? Tap Ask and get a random Yes or No (with an optional Maybe). Crypto-fair and instant, in your browser.

😎Username GeneratorGenerate cool random usernames from adjectives and nouns, with snake_case, camelCase and optional numbers. Copy any or all, in your browser.

Device Tests

📷Webcam TestTest your webcam in the browser: live preview, resolution, frame rate and device name, with mirror toggle and camera selection. Runs 100% locally — nothing is recorded or uploaded.

🎙️Mic TestTest your microphone in the browser with a live level meter and waveform, plus device name and sample rate. Audio is analyzed locally — nothing is recorded or uploaded.

⌨️Keyboard TestPress any key to see event.key, event.code and keyCode, with a press history and per-key counters. Great for finding broken keys. Runs locally — no keystrokes are recorded or sent.

🎮Gamepad TestTest any game controller in the browser: live button presses, analog trigger values and stick axes shown as bars. Works with Xbox, PlayStation and generic pads. Runs locally — nothing is recorded or uploaded.

🖥️Dead Pixel TestCheck your screen for dead or stuck pixels with fullscreen solid colors — white, black, red, green, blue and more. Click to cycle colors, Esc to exit. Runs locally — no data is collected or uploaded.

🖱️Click Speed TestMeasure your clicks per second (CPS) over 1 to 100 seconds with a live timer, click counter and best-of-session score. Runs entirely in your browser — nothing is recorded or uploaded.

⚡Reaction Time TestMeasure your reaction time in milliseconds: wait for red to turn green, then click as fast as you can. Five rounds with per-round results and average. Runs locally — nothing is recorded or uploaded.

Japan

🗾Wareki ConverterConvert Gregorian years to Japanese era years (Meiji, Taishō, Shōwa, Heisei, Reiwa) and back, with era-change boundary years handled correctly.

🎂Japanese Age CalculatorEnter a birth date or year to get the current age, traditional kazoe-doshi age, Japanese era birth year and zodiac animal, plus a 100-year age reference table.

📆Rokuyō CalendarCheck the rokuyō (Taian, Tomobiki, Butsumetsu…) for any date with a month calendar view — the traditional lucky-day cycle used for Japanese weddings and ceremonies.

🐉Eto Zodiac CalculatorFind the Japanese zodiac animal (jūnishi) and full sexagenary eto (like 丙午 hinoe-uma) for any year, plus every recent year that shares the same animal.

⛩️Yakudoshi CalculatorEnter your birth year to see your Japanese yakudoshi (unlucky) years by kazoe-doshi age — maeyaku, honyaku and atoyaku for men and women — and whether this year is one of them.

🎌Japan Public HolidaysFull list of Japanese national holidays for any year 2020–2030, computed by the official rules (Happy Monday, equinoxes, substitute holidays) with a next-holiday countdown.

📝Genkōyōshi CounterPaste Japanese text to count characters and convert them into 400- or 200-square genkōyōshi manuscript pages, with a line-aware estimate that counts line breaks like real manuscript paper.

Security

🔒File EncryptorEncrypt any file with a password entirely in your browser — the file never leaves your device. AES-GCM-256 with PBKDF2 (310,000 iterations); decrypt the .enc file the same way, offline.

🔐Text EncryptorEncrypt a message with a password right in your browser — the text and password are never uploaded or stored. AES-GCM-256 + PBKDF2 packed as portable Base64 you can paste anywhere and decrypt later.

🔑TOTP Code GeneratorGenerate RFC 6238 authenticator (2FA) codes from a Base32 secret entirely in your browser — the secret is never sent, stored, or logged. Supports 6/8 digits, 30/60 s periods, SHA-1/256/512, with a live countdown.

🧾File Hash / ChecksumCompute SHA-256, SHA-1, SHA-384 and SHA-512 checksums of any file locally — the file is hashed in your browser and never uploaded. Paste an expected checksum to verify a download instantly.

🎲Passphrase GeneratorGenerate memorable Diceware passphrases from the EFF wordlist with cryptographically secure randomness — created in your browser, never sent or stored. Word count, separators, capitalization, numbers and a live entropy estimate.

Audio

🌊White NoiseGenerate white, pink or brown noise for focus and sleep, with volume control and a fade-out sleep timer. Runs entirely in your browser.

🧠Binaural BeatsGenerate binaural beats with adjustable carrier and beat frequency, plus presets for sleep, meditation, relaxation and focus. Headphones required.

🎤Voice RecorderRecord audio from your microphone with a live level meter, then play it back and download it. 100% local — nothing is ever uploaded.

🗣️Text to SpeechRead any text aloud using your device’s voices. Choose voice, speed and pitch, with pause and resume — right in your browser.

Data

📊CSV ViewerView CSV as a sortable table: paste or open a file, filter rows, remove duplicates, and export the cleaned CSV — all in your browser.

📗Excel ⇄ CSV ConverterConvert .xlsx/.xls to CSV or CSV to .xlsx entirely in your browser — pick a sheet, download the result. No upload, files never leave your device.

📈Chart MakerPaste simple comma-separated data and get a bar, line, pie or doughnut chart with a live preview — download it as a PNG. Runs locally.

🧪Mock Data GeneratorGenerate up to 500 rows of fictional test data — names, emails, phones, cities, companies, UUIDs, dates — as a table, JSON and CSV. All local.

Gaming

🎯FPS Sensitivity ConverterConvert your mouse sensitivity between CS2, CS:GO, Valorant, Apex Legends, Overwatch 2, Call of Duty and more. Keeps the same cm/360 so your aim feels identical, with eDPI shown for both games.

🖱️eDPI CalculatorCalculate your eDPI (DPI × in-game sensitivity) or work backwards from a target eDPI to the sensitivity you need. Includes rough pro-player reference ranges for Valorant and CS2.

🎰Gacha Probability CalculatorCalculate your real chance of pulling a character or item: probability of at least one hit in N pulls, pulls needed for 50/90/99% odds, expected hits, hard-pity guarantee and total cost.

⛏️Minecraft Coordinate ConverterConvert Minecraft coordinates between the Overworld and the Nether (X and Z ÷ 8, Y unchanged). Line up Nether portals perfectly and plan fast Nether tunnels — 1 Nether block = 8 Overworld blocks.

Fashion

👕Clothing Size ConverterConvert international clothing sizes for women’s dresses & tops, men’s shirts (collar) and suits between JP, US, UK, EU and S–XL — pick your size in one system and see all the others, with a full chart.

💍Ring Size ConverterConvert ring sizes between Japanese 号, US, UK letters and EU/ISO circumference, or start from a measured inner diameter or circumference in mm — nearest match plus a full chart.

👙Bra Size ConverterConvert bra band and cup sizes between JP, US, UK, EU and FR, or calculate your JP size from underbust and bust measurements in cm — with band and cup charts and notes on where systems diverge.

🧺Laundry Symbols GuideLook up washing, bleaching, drying, ironing and professional-care symbols from the new JIS L0001 standard (identical to ISO 3758) — around 30 core symbols with plain-language meanings and instant search.

Cars & Bikes

🛞Tire Size ComparatorCompare two tire sizes (e.g. 205/55R16 vs 215/50R17): sidewall, overall diameter, circumference, difference in mm and %, and speedometer error at 100 km/h — all in your browser.

⛽Trip Fuel Cost CalculatorEstimate fuel cost for any trip: distance, fuel economy (km/L or L/100km), price per litre, round-trip and cost split per person — instant results in your browser.

🐎Power & Torque ConverterConvert engine power between PS, kW and hp, and torque between N·m, kgf·m and lb-ft. Enter any one value and see the others instantly — all in your browser.

Pets

🐶Pet Age CalculatorConvert your dog or cat’s age to human years — dogs by size class (small, medium, large) — with a full reference table. A rough guideline, right in your browser.

🍖Pet Calorie CalculatorEstimate your dog or cat’s daily calorie needs from weight and life stage (RER = 70 × kg^0.75 × factor), plus grams of food per day from the label’s kcal/100 g. A general guide — confirm with your vet.

PC & Hardware

⏬Download Time CalculatorCalculate how long a download takes from file size and connection speed (Mbps/Gbps), with bits-vs-bytes handled correctly and common speed presets.

🎬Video Bitrate CalculatorConvert video bitrate and duration to file size, or a target file size to the required bitrate — with YouTube upload bitrate reference values.

🔌PSU Wattage CalculatorEstimate your PC build’s power draw by component tier (CPU, GPU, drives, fans) and get a recommended PSU size with healthy headroom for GPU spikes.

💾RAID CalculatorCalculate usable capacity, storage efficiency and fault tolerance for RAID 0, 1, 5, 6 and 10 from your drive count and size.

🖥️PPI CalculatorCalculate a display’s pixels per inch, dot pitch and megapixels from its resolution and diagonal size, with common monitor comparisons.

Sports

🏃Race Time PredictorPredict your 5K, 10K, half-marathon and marathon times from any recent race result using the Riegel formula, with target paces per km.

⚾Baseball Stats CalculatorCalculate batting average, OBP, SLG and OPS plus pitching ERA, WHIP and K/9 — with proper baseball innings notation (6.1 = 6⅓ IP).

🚴Bike Gear CalculatorWork out gear ratio, speed at any cadence and gear inches from chainring, cog and wheel size — or paste a whole cassette for a full gear table.