Tool Directory125 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 Nickname GeneratorMixes friendly adjectives and words into a batch of nickname ideas.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.Online NotepadA notepad that saves to this browser as you type, with counts and .txt download.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.Christmas Card MakerPick a template, add your message and save a Christmas card as a PNG image.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.GIF MakerJoin several pictures into one animated GIF.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.Add Border to PhotoAdd a border and round the corners. PNG keeps the corners transparent.Circle Crop ImageCuts a photo into a circle and saves a PNG with a transparent outside. Border optional.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.Grayscale Image ConverterTurn a photo black and white, sepia or inverted, with adjustable strength.Invert Image ColorsFlips every colour to its opposite, like a film negative. Grayscale invert too.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.Image Size CheckerShows an image's width and height in pixels, file size, ratio and format.Add Text to PhotoType it, place it, save it at the photo’s own size.Add Watermark to ImagesPut text or a logo on your pictures, many at once, all on your device.JPG to PDFSeveral photos, one PDF, made on your device.Monitor TestOne colour at a time, the whole screen, nothing else on it.Photo Collage MakerDrop photos into a layout, adjust each one in its cell and save a single collage image.Add Date Stamp to PhotoReads when a photo was taken and stamps the date in a corner, old digital-camera style. Batch too.Pixel Art ConverterTurn a photo into chunky pixels with a small palette, like retro dot art.White Background to Transparent PNGRemoves a white (or chosen) background and saves a transparent PNG. Best for logos and signatures.QR Code GeneratorStatic QR codes for links, Wi-Fi and contact cards. No watermark, no expiry, nothing uploaded.QR Code ScannerReads a QR code from your camera or a picture. Links open only when you click.Online Screen RecorderRecord your screen, a window or a tab, play it back and download it. No install, no upload.Signature MakerSign with the mouse or a finger, download it with no background.Video CompressorRe-saves a video as WebM at a lower resolution and bitrate, and shows the size before and after.Video to Audio (WAV)Pulls the sound out of a video and saves it as a WAV file. No upload.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.Guitar TunerListens to a string through your mic and shows whether it is sharp or flat. Ukulele too.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.New Year CountdownShows the days, hours, minutes and seconds to the next 1 January, midnight, in your local time.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.Reorder PDF PagesDrag pages into a new order and save the PDF in that order.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 to TextPull the text out of a PDF to copy or save as .txt. Pick pages if you like.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.Online Voice RecorderRecord your voice from the mic, play it back and download it. Nothing is sent anywhere.Webcam TestYour camera's picture, plus the resolution and fps it actually sends.
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New Year CountdownShows the days, hours, minutes and seconds to the next 1 January, midnight, in your local time.Photo Collage MakerDrop photos into a layout, adjust each one in its cell and save a single collage image.Add Date Stamp to PhotoReads when a photo was taken and stamps the date in a corner, old digital-camera style. Batch too.White Background to Transparent PNGRemoves a white (or chosen) background and saves a transparent PNG. Best for logos and signatures.