Tool Directory102 Modules · Local-first
Utileno
Free online calculators, converters and text tools that run in your browser
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Percentage CalculatorAnswer the three most common percentage questions instantly — everything runs in your browser.Date CalculatorCount the exact number of days between two dates — instantly, right in your browser.Age CalculatorEnter a date of birth and get the exact age in years, months and days — plus a birthday countdown.Discount CalculatorEnter a price and a % off to see the sale price and exactly how much you save.Word & Character CounterPaste or type text and get live character, word, line, paragraph and byte counts — nothing is uploaded.JSON Formatter & ValidatorFormat, validate and minify JSON without uploading it — your data stays in your browser.
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Age CalculatorEnter a date of birth and get the exact age in years, months and days — plus a birthday countdown.Age in a Given YearBirth year and a year in question are enough — all three Korean ages, with the one in use back then marked.Korean Annual Leave CalculatorFrom a hire date: leave earned, leave still usable, the next grant and the day each one lapses.Business Days CalculatorWorking days between two dates, or the date N business days out — weekends and Korean public holidays taken out for you.Date CalculatorCount the exact number of days between two dates — instantly, right in your browser.Days From TodayType a number of days and instantly see the exact date and weekday it lands on.D-Day CountdownAdd the dates you are counting to. Days are counted on the Seoul calendar.Korean HolidaysEvery South Korean public holiday for the year — lunar holidays and substitute days included.Lunar Birthday CalculatorSee what solar date a lunar birthday falls on each year, then take the whole list into your calendar.Korean Lunar ConverterConvert Korean lunar dates to solar and back — leap months, the sexagenary year, and the zodiac included.Time Zone Meeting PlannerPick the cities, set each working day, and see the hours that actually overlap.Weekly Holiday Pay CalculatorHourly wage and weekly hours in — the paid rest day, the week’s total and what each hour is really worth out.Work Hours CalculatorWork out how many hours you worked between two times, minus breaks — or total a whole week with overtime. Overnight shifts included.Korean Zodiac CalculatorThe animal year a birthday belongs to, counted from Seollal.
BMI CalculatorHeight, weight, and the number that comes out of them.Korean Brokerage Fee CalculatorThe most an agent can charge on a housing deal — bracket, rate and cap shown, VAT optional.Discount CalculatorEnter a price and a % off to see the sale price and exactly how much you save.Percentage CalculatorAnswer the three most common percentage questions instantly — everything runs in your browser.Percentage Increase / DecreaseEnter the original and the new value — get the percent change, its direction, and the difference instantly.Pyeong ConverterKorean real estate talks in pyeong but lists in square meters — type either and get the rest instantly.Ratio CalculatorSimplify a ratio to its lowest terms and scale it to any size — both directions.Unit ConverterEveryday units — length, weight, temperature, volume. No currency, no rates.
English Name GeneratorBrowse by sound, by letter, or by what it means.Ladder GameType the names, tap one, and the line finds its way down. Nothing is uploaded.Password GeneratorMade by your browser, never sent anywhere, never stored.Random Number GeneratorSet a range, choose how many numbers, and generate — with cryptographic randomness.Random PickerPaste a list, press Pick, and get a fair random winner — your list never leaves your browser.Spin the WheelPut the choices on the wheel and let it decide.Team GeneratorPaste names, choose the number of teams, and get a fair random split in one click.
Case ConverterPaste once, take whichever spelling you needed.Chosung QuizAnswers in, consonants out. Share the link and host the round.Duplicate Line RemoverPaste a list, and repeated lines disappear — with control over case, whitespace and ordering.EmojiFind it, click it, paste it.English Address ConverterPaste the Korean address, get the boxes a foreign form asks for.Fancy TextNot a font — different letters that look like one.Korean Keyboard ConverterThe keys were right, the mode was wrong. Put it back.Keyboard TestPress a key. If it arrives, it lights up and stays marked.Korean Text EmoticonsWhat Korean chat faces and consonant shorthand actually mean — ㅇㅅㅇ, ㅋㅋ, ㅇㅈ and more.Korean RomanizerTurn Hangul into the Latin alphabet with the official Revised Romanization — sound changes and all, plus passport-style name spellings.Line Break RemoverText that came out of a PDF, put back into sentences.Markdown PreviewType on the left, read on the right. No upload, no scripts run.Special CharactersThe marks a keyboard hides. Click to copy, search by name.Text DiffPaste two versions of a text and see exactly which lines were added, removed or changed.Text to SpeechPaste something and have the device read it out.Typing Speed TestOne minute, one sentence at a time, counted honestly.Word & Character CounterPaste or type text and get live character, word, line, paragraph and byte counts — nothing is uploaded.
Number Base ConverterBinary, octal, decimal and hex both ways, with the working shown.Base64 Encoder & DecoderText and files to Base64 and back, safe for any language.Cron Expression ExplainerReads a cron line in plain words and lists the next run times.CSV ↔ JSON ConverterPaste a spreadsheet, take JSON — or the other way round.Hash GeneratorText or file, four algorithms at once, nothing uploaded.JSON Formatter & ValidatorFormat, validate and minify JSON without uploading it — your data stays in your browser.Meta Tag GeneratorFill the boxes, take the head tags.Punycode ConverterDomains with letters DNS cannot carry, and the xn-- form that it can.Regex TesterType a pattern and see what it catches.Unix Timestamp ConverterPaste an epoch timestamp to get local, UTC and ISO dates — or pick a date to get its timestamp.URL Encoder / DecoderPercent-encoding both ways, with the encodeURIComponent and encodeURI difference shown.UUID GeneratorVersion 4, from the browser random source. Nothing is sent or stored.
Aspect Ratio CalculatorEnter a width and height to get the ratio — and resize to any target without distortion.Barcode GeneratorType the number, take the bars.Color ConverterPaste a color in any CSS format and get the other formats plus a live preview.EXIF & Location RemoverStrip GPS, camera and timestamp data from photos before you share them. No quality loss, nothing uploaded.HEIC to JPG ConverteriPhone photos that will not open, turned into plain JPG or PNG. Batch, ZIP download, nothing uploaded.ID Photo Resize & CropDrop a photo, fit it in the frame, save at the exact pixel size. Includes the 413×531 px passport preset. Nothing is uploaded.Image Color PickerThe palette of a picture, or the colour of one pixel in it.Image Compressor (target file size)Say the size limit, get the best-looking file that fits under it. Nothing is uploaded.Image Converter (WebP/AVIF → JPG/PNG)Turn WebP and AVIF files that chat apps and old software refuse into plain JPG or PNG. Nothing is uploaded.Crop & Resize ImagesCut it down, size it right, keep it on your device.Flip & Rotate ImageMirror it, turn it 90° or 180°, and save it in the format it came in.Merge ImagesSeveral pictures, one file. Drawn on your device.Image MosaicDrag over what should go, and it goes.Image to Text (OCR)Pull the words out of a screenshot without sending it anywhere.Add Text to PhotoType it, place it, save it at the photo’s own size.JPG to PDFSeveral photos, one PDF, made on your device.Monitor TestOne colour at a time, the whole screen, nothing else on it.QR Code GeneratorStatic QR codes for links, Wi-Fi and contact cards. No watermark, no expiry, nothing uploaded.Signature MakerSign with the mouse or a finger, download it with no background.Video to GIFPick a clip and turn it into a GIF. The video never leaves your device.Video TrimmerSet a start and end and save just that part. The video never leaves your device.
Vibe Coding Project MatrixOrganize your projects by importance and urgency, and see each one’s status at a glance by color.CPS TestClicks counted over 1, 5 or 10 seconds. The first click starts it.Decision MatrixList your options, weight what matters, score each one — the ranking updates as you type.Eisenhower MatrixSort tasks by urgency and importance on a one-screen 2×2 board — saved in your browser, no account needed.MetronomeA steady click at the BPM and time signature you set, with tap tempo.Mic TestSpeak and the bar moves. Record a few seconds and hear it back.Mouse TestCheck all five buttons and the wheel, and catch clicks that register twice.PDF CompressScans and photo-heavy PDFs made smaller. Nothing uploaded, pages untouched.Delete PDF PagesPick the pages to lose. The rest comes back as it was.PDF MergeSeveral PDFs in, one PDF out. Nothing is uploaded, nothing is re-rendered.Password-Protect a PDFA password on the file itself, set on your device.Rotate PDF & SaveThe downloaded file is the rotated one, not just the view.PDF SplitPick the pages, get a PDF with just those — or one file per page. Nothing is uploaded, nothing is re-rendered.PDF to JPGEvery page as an image, rendered on your device.PDF WatermarkYour text across every page, written on your device.Pomodoro Timer25 minutes down, then 5. The tab title carries the countdown.Reaction Time TestWait for green, then click. Five tries, timed in milliseconds.Screen Resolution CheckerYour screen resolution, real pixels, window size and pixel ratio at a glance.Sound MeterA rough decibel reading from your mic. Uncalibrated, for reference only.Speaker TestPlay a test tone left, right or both to check sound and direction.CSAT (Suneung) Exam TimerRuns on the real Suneung period schedule, by the clock or from any period now.Timer & StopwatchSet it, or start it running. Either way it reads the clock.Webcam TestYour camera's picture, plus the resolution and fps it actually sends.
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Base64 Encoder & DecoderText and files to Base64 and back, safe for any language.MetronomeA steady click at the BPM and time signature you set, with tap tempo.Screen Resolution CheckerYour screen resolution, real pixels, window size and pixel ratio at a glance.Sound MeterA rough decibel reading from your mic. Uncalibrated, for reference only.