Free online tools that run in your browser
Free browser tools that run entirely on your device: hardware tests, calculators, and converters. No signup, no install, nothing uploaded.
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Hardware
Webcam TestCheck your camera works in the browser, with resolution and FPS readout.Mic TestTest your microphone and hear yourself back instantly.Monitor TestDead pixel, burn-in, and uniformity tests for any screen.Screen RecorderRecord your screen or a browser tab to a WebM file, with pause and resume and no watermark.CompassFind magnetic north from your phone's compass sensor, with a live heading readout.Voice RecorderRecord your voice, trim the takes, and export the trimmed range as an MP3, all in your browser.Guitar TunerTune your guitar from the browser with live pitch detection and a cents readout for six common tunings.Keyboard TesterPress every key on a US ANSI layout and watch it light up, with keydown and keyup states, hold times, and rollover checks.Mouse TesterCheck every mouse button, measure your double-click gap, run a clicks-per-second test, and get a polling rate estimate.Gamepad TesterTest controller buttons, analog triggers, and stick drift in the browser, with a rumble test where the pad supports it.
Calculators
Mini-Split BTU CalculatorSize a mini-split air conditioner by room, climate, and insulation.Dog Chocolate Toxicity CalculatorFind out fast if the chocolate your dog ate is dangerous.Vegan Protein CalculatorYour daily protein target from plant-based sources only.Sleep CalculatorPlan bedtimes around full 90-minute sleep cycles, or see when you'll wake up.Grade CalculatorCombine weighted categories into a course grade and find the final exam score a target grade needs.Time Card CalculatorAdd up weekly hours from clock times, deduct lunch breaks, and split regular from overtime.Baseball Stats CalculatorBatting average, on-base percentage, and ERA from a stat line, with 9, 7, or 6 inning games.Stair CalculatorTurn a total rise into risers, treads, stringer length, and a two-flight landing layout, with a 2R+T comfort check.Deck Board CalculatorCount boards, courses, linear feet, and joists from your deck size and board width, with a waste factor you control.Mulch CalculatorConvert bed area and depth into cubic yards and the number of 2 or 3 cubic foot bags to buy.Gravel CalculatorSize a gravel order in tons for a driveway layer or a french drain trench, from typical per-yard densities.Roof Pitch CalculatorConvert rise and run into an X:12 pitch, read the slope in degrees, and get rafter length per foot of run.Board Foot CalculatorTotal board feet for a lumber order, one line per board size, with spray foam coverage explained.Jet Lag CalculatorPlan when to sleep and when to seek light across a time-zone shift, with layovers and daylight saving handled.Pace CalculatorRunning pace from any time and distance, per-km or per-mile splits, and treadmill speed conversions.Race Time PredictorPredict your time at any race distance from a recent result with the Riegel formula.Zone 2 Heart Rate CalculatorFind your zone 2 band with the Karvonen method and a Tanaka age-based maximum estimate.Freelance Hourly Rate CalculatorTurn a target income and business expenses into an hourly and day rate, or check what an offered rate pays per year.Sensitivity ConverterConvert mouse sensitivity between CS2, Valorant, Apex, and more, with cm/360, eDPI, and monitor-distance match.Golf Handicap CalculatorScore differentials, a WHS Handicap Index from your last 20 rounds, and USGA scramble allowances for 2 to 4 players.Aspect Ratio CalculatorSimplify sizes to 16:9, 4:3, or cinema ratios, solve for a missing side, and resize in pixels or inches.Cat Calorie CalculatorDaily calories for your cat from weight and life stage, from growing kittens to weight-loss plans.Raw Dog Food CalculatorDaily and per-meal raw food portions as a percent of your dog's weight, from puppy to senior.Chicken Coop Size CalculatorCoop and run size, roost length, and footprint for your flock, from extension guidance.
Developer & DNS
SPF Record GeneratorBuild an SPF TXT record with includes, IP allowlists, and a softfail or hardfail policy.DMARC Record GeneratorBuild a DMARC policy record for your domain and copy it into DNS.DKIM Record GeneratorBuild the DKIM TXT record for your selector and public key, ready to publish in DNS.JSON to CSV ConverterTurn JSON arrays into CSV files in your browser, with delimiter choice and nested-object flattening.Favicon ConverterTurn a PNG or SVG into favicon.ico with 16, 32, 48, and 256 pixel sizes plus an apple-touch icon, all in your browser.Cron Expression GeneratorBuild cron expressions for standard crontab, AWS EventBridge, and Quartz, with a plain-English explainer for every field.
Print & paper
Bingo Card GeneratorPrint numbered bingo cards for classroom games, with 1-75 and 1-90 presets.Word Search MakerTurn a word list into a printable word search puzzle, with seeds that reproduce the same sheet.Name Tracing GeneratorPrintable name tracing sheets with outline or dotted letters and guide lines.Spelling Worksheet GeneratorTurn a word list into a printable unscramble-the-word spelling sheet, with seeded layouts and a full answer key.Text to HandwritingTurn typed assignment text into handwriting on lined notebook paper, then print it or save it as a PDF.Printer Test Page (Color)Print a color test page from the browser: RGB and CMYK gradient bars, an alignment grid, a grayscale ramp, and text sizes.Printer Test Page (Black and White)A pure black bar, a 21-step gray ramp, and line weights from hairline to 2 mm for laser printers and black-only printing.Printer Test Page (PDF)Download the color and black and white test pages as small PDFs, with notes for Epson, Canon, and HP printers.
Text tools
Word CounterCount words, characters, sentences, and paragraphs live as you type, with an estimated reading time. Accepts .txt, .md, and .pdf files.Fancy Text GeneratorTurn plain text into bold, script, bubble, and other Unicode styles, ready to paste.Text Case ConverterConvert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case, live as you type.Text Line ToolsRemove duplicate lines, sort, shuffle, number, and clean up empty lines in one pass.