Tool Directory27 Modules · Local-first
Utileno
Free online tools that work instantly in your browser.
Quick access
Popular tools
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.
Module catalog
Categories
Date & Time
Age CalculatorEnter a date of birth and get the exact age in years, months and days — plus a birthday countdown.Business Days CalculatorWorking days between two dates — 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.Korean HolidaysEvery South Korean public holiday for the year — lunar holidays and substitute days included.Korean Lunar ConverterConvert Korean lunar dates to solar and back — leap months, the sexagenary year, and the zodiac included.Work Hours CalculatorWork out how many hours you worked between two times, minus breaks — overnight shifts included.
Math & Money
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.
Random
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.Team GeneratorPaste names, choose the number of teams, and get a fair random split in one click.
Text
Duplicate Line RemoverPaste a list, and repeated lines disappear — with control over case, whitespace and ordering.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.Text DiffPaste two versions of a text and see exactly which lines were added, removed or changed.Word & Character CounterPaste or type text and get live character, word, line, paragraph and byte counts — nothing is uploaded.
Developer
Image & Design
Productivity
Vibe Coding Project MatrixOrganize your projects by importance and urgency, and see each one’s status at a glance by color.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.
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Business Days CalculatorWorking days between two dates — weekends and Korean public holidays taken out for you.Korean Text EmoticonsWhat Korean chat faces and consonant shorthand actually mean — ㅇㅅㅇ, ㅋㅋ, ㅇㅈ and more.Korean HolidaysEvery South Korean public holiday for the year — lunar holidays and substitute days included.Korean RomanizerTurn Hangul into the Latin alphabet with the official Revised Romanization — sound changes and all.