Simple tools, done right.
Free online tools that run entirely in your browser. No sign-up, no uploads — just fast tools for images, text, time and more.
139 tools
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TimerA big, clear countdown with an alarm — survives a page refresh.Word CounterLive word, character and sentence counts — accurate in every language.Image ResizerResize one photo or a batch of up to 50, by pixels or percent — privately, in your browser.QR Code GeneratorMake a static QR code locally, add a logo or brand colors, and download a clean SVG or PNG — no account, watermark, or service expiry.Password GeneratorCreate random passwords and memorable word passphrases with a visible entropy estimate — no sign-up.BMI CalculatorEnter height and weight to compare WHO and Korean adult BMI ranges at once.Percentage CalculatorAll four percentage calculations update as you type, with the formula behind each result — no button needed.JSON FormatterPretty-print, minify and explore JSON in a tree view — with the exact line and column of any syntax error.Age CalculatorYour exact age, Korean age conventions, zodiac animal and star sign — all from one date of birth.Pomodoro TimerFocus on one selected task, keep a local session record, and get optional alerts without signing in.Image CompressorTell it a target size in KB or MB and it finds the best quality to hit it — privately, on your device.Base64 Encode/DecodeConvert text and files to Base64 and back — URL-safe, offline-capable, nothing leaves your browser.
Background RemoverMake a transparent PNG with local AI processing. Your image never leaves this browser.Photo Collage MakerPut photos together in a live layout, then download a high-resolution collage without uploading them.EXIF Viewer & RemoverCheck what a photo reveals, then remove its metadata locally in one file or a batch.Favicon GeneratorCreate a complete favicon set from an image, letters, or an emoji — with no upload.GIF MakerTurn photos into a looping GIF with frame order, speed, and size under your control.HEIC to JPGTurn iPhone HEIC photos into JPG without uploading them, with compatible capture dates preserved.Blur & PixelateMark only the detail to hide, then blur or pixelate it entirely on your device.Image CompressorTell it a target size in KB or MB and it finds the best quality to hit it — privately, on your device.
MP3 CutterChoose a clip on the waveform, preview it, and save an MP3 without uploading or re-encoding it.Screen RecorderRecord a screen, window or tab, then download the browser-made video directly from this device.Video CompressorMake a video smaller on your device with clear quality and resolution controls.Video to GIFMake a compact GIF from a short video clip — privately, in your browser.MP4 to MP3Extract the audio you need from a local video, choose its time range, and save an MP3 without an upload.Voice RecorderRecord, pause, listen and save an MP3 without sending your voice recording to a server.
Case ConverterConvert writing and code identifiers live, with an explicit choice of AP or Chicago Title Case.Special CharactersFind a symbol by name, code point or Korean keyboard group, then copy it in one click.Fancy Text GeneratorMake copy-ready Unicode text for social bios and captions, with styles that genuinely change what you typed.Find and ReplaceReplace text live with safe literal matching, regex options, and a preview that never overwrites the original.Korean RomanizationTurn Hangul into Revised Romanization live, then switch to a separate Korean-name format when you need it.Invisible CharacterCopy the right invisible Unicode character, then check exactly what a platform kept.Korean Spell CheckerReview common Korean spelling and spacing mistakes live, with no text sent to a server.Lorem Ipsum GeneratorCreate copy-ready Latin or Korean placeholder text live.
Age CalculatorYour exact age, Korean age conventions, zodiac animal and star sign — all from one date of birth.Alarm ClockSet several labeled alarms in one clean tab and keep them saved on this device.CountdownSet a moment, watch it update every second, and share the exact event in one privacy-friendly link.Date CalculatorCompare two dates or shift one by a calendar or business-day amount, with US and Korean public holidays built in.Hours CalculatorAdd a week of shifts, deduct unpaid breaks, and get accurate hours and decimals immediately.Interval TimerStart a workout preset in one click, or set your own work, rest and rounds — with optional voice cues.Korean Lunar ConverterConvert both ways and see leap-month status, ganji, zodiac, and the 2026–2027 solar dates for the same lunar birthday.MetronomeSet a steady click in seconds with tap tempo, a clear first-beat accent and browser-saved settings.
Korea Annual Leave CalculatorCompare hire-date and fiscal-year leave side by side, then inspect any termination shortfall and unused-leave pay formula.Average CalculatorPaste a list once to see its average, middle, most common value, and spread — with the sample or population choice visible.BMI CalculatorEnter height and weight to compare WHO and Korean adult BMI ranges at once.Calorie CalculatorSee your Mifflin–St Jeor BMR formula, maintenance calories, and a live planning target in one place.Compound Interest CalculatorSee a starting amount and monthly savings grow together, with a live annual chart and schedule—without sending your numbers anywhere.Discount CalculatorWork out a final price, actual percent off, or original price — including up to three successive discounts shown step by step.Currency ConverterTurn the rate you were actually quoted into a clear received amount, total charges, and effective rate — right in your browser.Fraction CalculatorType fractions naturally and see an exact answer, mixed number, decimal, and the working immediately — no button needed.
Area ConverterSquare feet, square metres, acres, hectares and Korean pyeong — live results for all common area units in one place.Data Size ConverterConvert MB, GB, TB, MiB and GiB live — with decimal and binary units clearly separated side by side.Korean Number ConverterTurn a won amount into plain Korean and document-ready 금 or 일금 … 원정 wording, then copy the exact form you need.Length Convertercm, inches, feet, meters and more — converted live, with a feet+inches height converter built in.Number Base ConverterConvert any whole number from base 2 to 36, with binary, octal, decimal and hexadecimal visible together.Shoe Size ConverterEnter one adult size to compare Korea, Japan, US, UK and EU labels at once — then check the brand’s own fit chart.Speed ConverterConvert mph, km/h, m/s and knots, then compare the equivalent running pace in min/km and min/mi.Temperature ConverterCelsius, Fahrenheit and Kelvin, converted live, with an oven temperature table built in.
Compress PDFMake scan-heavy PDFs smaller with a quality level you can see — without uploading the file.Delete PDF PagesClick the pages to remove, check what remains, and download a new PDF — entirely on your device.Merge PDFCombine PDF files into one — drag to set the order — without uploading anything.Add Page Numbers to PDFNumber the pages you choose, where you choose — the PDF stays on your device from selection to download.PDF to JPGChoose the pages and resolution, then get JPGs or a ZIP — without uploading your PDF.PDF to TextExtract selectable PDF text locally, with a separate copy button for every page.Protect PDFAdd an opening password to one PDF locally — no upload or account needed.Rearrange PDF PagesPut pages in the right order with drag-and-drop or visible keyboard controls — entirely on your device.
Base64 Encode/DecodeConvert text and files to Base64 and back — URL-safe, offline-capable, nothing leaves your browser.Color ConverterConvert an opaque sRGB color as you type, copy modern CSS values, and see its WCAG contrast against white and black.CSV ↔ JSONConvert in either direction live, then inspect the converted rows in a table before you copy or download.Hash GeneratorCreate and compare text or file checksums locally, without uploading them.JSON FormatterPretty-print, minify and explore JSON in a tree view — with the exact line and column of any syntax error.JWT DecoderPaste a JWT or Bearer token to read its claims and live expiry timing without sending or saving the token.Regex TesterTest a JavaScript regex as you type, inspect every match and capture, then return to the same local working state later.Screen Resolution CheckerSee the browser’s screen, viewport, DPR, and zoom readings side by side—without confusing CSS pixels with a panel’s native resolution.
Barcode GeneratorMake a live Code 128 or EAN-13 barcode locally, with check-digit validation and a sharp SVG ready to download or copy.Coin FlipA quick two-choice decision with a persistent local tally and recent results.Dice RollerRoll d4 to d1000, combine dice in one expression, and keep the latest results at hand.Ladder GameSet the names and outcomes, then trace an animated Ghost Leg path with a securely shuffled one-to-one result.Lotto Number GeneratorGenerate sorted Lotto 6/45 lines with the numbers you want to keep or leave out, entirely in your browser.Password GeneratorCreate random passwords and memorable word passphrases with a visible entropy estimate — no sign-up.QR Code GeneratorMake a static QR code locally, add a logo or brand colors, and download a clean SVG or PNG — no account, watermark, or service expiry.QR Code ScannerScan a camera view, image, or pasted screenshot locally, then inspect the decoded link, text, or Wi-Fi details before acting.
CPS TestTest click speed with mouse, touch, Space or Enter, then compare a clear fixed-time CPS score and your local best.Dead Pixel TestRun nine precise full-screen colour fields with arrow-key controls and an adjustable automatic cycle.Keyboard TesterTest a full-size 104-key layout, check how many keys register together, and catch stuck or double-firing keys.Mic TestCheck the right microphone, see its input level, then record a short sample and hear it back — entirely in your browser.Mouse TestCheck every browser-visible button, then make 20 slow single presses to screen double-click patterns without relying on a raw counter.Reaction Time TestReact to five random visual signals, then see an average, median, spread and laboratory-reference percentile without an account.Speaker TestConfirm left and right channels first, then follow a live 20 Hz–20 kHz sweep without installing an app or granting microphone access.Typing TestType the sample text and see your words-per-minute and accuracy update live.