Tools that run in your browser

One page each, built from the same Rust and WebAssembly toolbox. Nothing you type is uploaded, and every one of them keeps working offline.

• EXIF Viewer and RemoverSee what your photo gives away, and take it back out, without uploading it.
• To-Do ListA list that survives a refresh, kept on your device and nowhere else.
• LLM Token Counter and Prompt ReducerCount tokens exactly, then cut the ones you are paying for nothing.
• Base64 Encoder and DecoderPaste text or Base64 and convert it instantly, in your browser.
• JSON Formatter and MinifierPretty-print unreadable JSON, or squeeze it back down to one line.
• JSON ValidatorFind out exactly which line and column broke your JSON.
• Word and Character CounterLive counts for words, characters, sentences and reading time.
• Lorem Ipsum GeneratorPlaceholder paragraphs, sentences or words, ready to paste.
• Writing AnalyzerLong sentences, passive voice, adverbs and filler, sentence by sentence.
• SEO Text AnalyzerKeyword density, phrase frequency and readability for your copy.
• Typing Speed TestOne minute, real words, honest numbers.
• Wheel of NamesType the names, spin the wheel, get one winner.
• Unix Epoch ConverterTimestamps to dates and back, in seconds or milliseconds.
• Online Alarm ClockSet a time, leave the tab open, get woken up.
• Online Stopwatch and TimerStart, lap, reset, or count down instead.
• Unit ConverterEleven categories, a hundred-plus units, instant conversion.
• Conversion TablesWhole reference tables, not one lonely number.
• Online CalculatorType the whole sum, functions and all, and read it as you go.
• HTML Color CodesPick a colour, get every code, check the contrast.
• Color Contrast CheckerThe ratio, the verdict, and the two colours actually shown together.
• Color Palette GeneratorOne color in, a matching set out, in eight kinds of harmony.
• Colour InformationEverything about one colour: codes, name, shades, tints, palettes.
• What Is My Screen Resolution?Your screen size, viewport, pixel ratio and aspect ratio.
• URL Encoder and DecoderPercent-encode a value, or read back one that is already encoded.
• Text Case ConverterEvery casing style at once, from one box of text.
• Hash GeneratorEvery common digest of your text, computed on your device.
• Percentage CalculatorPercent of, percent change, and adding a percentage on.
• Loan Payment CalculatorThe monthly payment, and what the interest adds up to.
• BMI CalculatorYour BMI, its category, and the healthy weight range for your height.
• Number Base ConverterBinary, octal, decimal, hex and every base up to 36.
• Word UnscramblerEvery word your letters can make, longest first.
• JWT DecoderRead any token's claims, and check an HMAC signature against your secret.
• Regex Tester and BuilderTest a pattern, then take it away as Python, Rust, Go or seven others.
• Text Diff CheckerSee exactly what changed between two versions.
• QR Code GeneratorMake a QR code, choose its colours, download it as PNG or SVG.
• World Clock and Time Zone ConverterEvery place you care about, side by side, and the hours that suit all of them.
• Countdown to a DateHow long until it happens, down to the second.
• Webcam and Microphone TestSee your camera and watch your mic level, before the call starts.
• Compress an ImageMake the file smaller without sending it anywhere.
• Quad RemesherTriangles in, quads out, running along the shape's curves and edges.
• STL Repair for 3D PrintingFind what your slicer will choke on, fix it, and download a watertight model.
• STL and 3D Model ViewerOpen a 3D model, turn it around, and read its real dimensions.
• Image Resizer and ConverterSet the pixels you need, or change the format, without uploading anything.
• Merge PDF FilesPut several PDFs into one, in the order you choose, without uploading them.
• Split a PDF and Extract PagesKeep the pages you want and leave the rest, without uploading anything.
• Fake CSV GeneratorDefine the columns, get the rows. Seeded, so the same file comes back.
• CSV Viewer and EditorOpen a CSV of any size, sort and search it, fix what is wrong, and save a copy.
• PDF to JPG, PNG or WebPTurn every page of a PDF into a JPG, PNG or WebP, without uploading it.
• JPG to PDFPut photos or scans into one PDF, in the order you choose, without uploading them.
• Crontab GeneratorWrite a cron expression, read what it means in English, and see when it next runs.
• Compress PDFSqueeze the images inside a PDF until the file fits, without uploading it.
• Random Number GeneratorDraw numbers from any range, all different if you need them to be, or roll dice.
• Password GeneratorStrong passwords made here, on a page that cannot send them anywhere.
• UUID and ULID GeneratorMake identifiers that will not collide, and read the ones you already have.
• Keyboard TesterPress each key and watch it light up. Whatever stays dark is the key that is broken.
• Speaker and Headphone TestWhich side is which, whether they are wired the same way, and how low they go.
• Dead Pixel TestOne colour at a time, full screen, so a pixel that does not match cannot hide.
• Gamepad TesterEvery button, trigger and stick on your controller, live, with drift and circularity.
• Mouse TestEvery button, the wheel, and the double clicks a worn switch sends by itself.
• Reaction Time TestWait for green, then click. Five goes, and your average in milliseconds.
• Markdown PreviewType markdown on the left, read it on the right, and take the HTML away.
• YAML to JSON and BackPaste either one and get the other, without uploading it.
• How Long Until Monday?Down to the second, counting to midnight on Monday.
• How Long Until Tuesday?Down to the second, counting to midnight on Tuesday.
• How Long Until Wednesday?Down to the second, counting to midnight on Wednesday.
• How Long Until Thursday?Down to the second, counting to midnight on Thursday.
• How Long Until Friday?Down to the second, counting to midnight on Friday.
• How Long Until Saturday?Down to the second, counting to midnight on Saturday.
• How Long Until Sunday?Down to the second, counting to midnight on Sunday.
• How Long Until Tomorrow?The hours, minutes and seconds left until midnight.
• How Long Until Morning?Down to the second, counting to six o'clock.
• How Long Until the Weekend?Counting to midnight at the start of Saturday.
• How Many Days Until Christmas?Down to the second, counting to midnight on 25 December.
• How Many Days Until Halloween?Down to the second, counting to midnight on 31 October.
• How Many Days Until Thanksgiving?Down to the second, counting to the fourth Thursday of November.
• How Many Days Until New Year?Down to the second, counting to midnight on 1 January.
• Lorem Ipsum: 3 ParagraphsThree paragraphs of placeholder text, already generated.
• Lorem Ipsum: 5 ParagraphsFive paragraphs of placeholder text, already generated.
• Lorem Ipsum: 1 ParagraphA single paragraph of placeholder text, already generated.
• Lorem Ipsum: 100 WordsExactly a hundred words of placeholder text.
• Lorem Ipsum: 50 WordsExactly fifty words of placeholder text.
• Lorem Ipsum: 5 SentencesFive sentences of placeholder text, already generated.
• Inches to Centimetres ChartEvery inch from 1 to 24, in centimetres.
• Centimetres to Inches ChartEvery centimetre from 1 to 30, in inches.
• Kilograms to Pounds ChartEvery kilogram from 1 to 25, in pounds.
• Celsius to Fahrenheit ChartEvery degree from -10 to 40 Celsius, in Fahrenheit.
• Oven Temperature Conversion ChartCelsius to Fahrenheit across the range an oven uses.
• Webcam TestSee what your camera sees, with its resolution and frame rate.
• Microphone TestWatch your level in real time, in decibels rather than guesses.
• Epoch to Date ConverterPaste a Unix timestamp and read the moment it means.
• Date to Epoch ConverterType a date and read its Unix timestamp, in seconds and milliseconds.
• Tip CalculatorThe rate, the bill, and what you actually hand over.
• Discount CalculatorWhat a percentage off actually leaves you paying.
• 1 Minute TimerSixty seconds, counting down, with a sound at zero.
• 5 Minute TimerFive minutes, counting down, with a sound at zero.
• 10 Minute TimerTen minutes, counting down, with a sound at zero.
• 20 Minute TimerTwenty minutes, counting down, with a sound at zero.
• 25 Minute Focus TimerTwenty-five minutes of one thing, with a sound at zero.
• Random Number 1 to 100A number between one and a hundred, drawn when the page opens.
• Random Number 1 to 10A number between one and ten, drawn when the page opens.
• Dice RollerTwo six-sided dice, rolled when the page opens.
• Cron: Every 5 MinutesThe expression, what it means, and when it next runs.
• Cron: Every HourThe expression, what it means, and when it next runs.
• Cron: Every Day at MidnightThe expression, what it means, and when it next runs.
• UUID v4 GeneratorRandom version 4 UUIDs, generated when the page opens.
• UUID v7 GeneratorTime-ordered version 7 UUIDs, generated when the page opens.
• ULID GeneratorLexicographically sortable ULIDs, generated when the page opens.
• Hex to Decimal ConverterType a hexadecimal number and read it in decimal.
• Decimal to Hex ConverterType a decimal number and read it in hexadecimal.
• Binary to Decimal ConverterType a binary number and read it in decimal.
• Base64 EncoderTurn text into Base64, in the tab, with nothing uploaded.
• URL DecoderTurn percent-encoded text back into what it says.
• PNG to JPG ConverterConvert PNG to JPG without uploading anything.
• JPG to PNG ConverterConvert JPG to PNG without uploading anything.
• WebP to PNG ConverterConvert WebP to PNG without uploading anything.
• WebP to JPG ConverterConvert WebP to JPG without uploading anything.
• PNG to WebP ConverterConvert PNG to WebP without uploading anything.
• JPG to WebP ConverterConvert JPG to WebP without uploading anything.
• Qwen Token CounterExact counts for Qwen 2.5, from its own tokeniser, in your browser.
• GPT-4 Token CounterExact counts for GPT-4, GPT-4 Turbo and GPT-3.5, in your browser.
• Cuenta atrásCuenta hacia cualquier fecha, al segundo, dentro de tu navegador.
• ¿Cuánto falta para el lunes?Al segundo, contando hasta la medianoche del lunes.
• ¿Cuánto falta para el martes?Al segundo, contando hasta la medianoche del martes.
• ¿Cuánto falta para el miércoles?Al segundo, contando hasta la medianoche del miércoles.
• ¿Cuánto falta para el jueves?Al segundo, contando hasta la medianoche del jueves.
• ¿Cuánto falta para el viernes?Al segundo, contando hasta la medianoche del viernes.
• ¿Cuánto falta para el sábado?Al segundo, contando hasta la medianoche del sábado.
• ¿Cuánto falta para el domingo?Al segundo, contando hasta la medianoche del domingo.
• ¿Cuánto falta para mañana?Las horas, minutos y segundos que quedan de hoy.
• ¿Cuánto falta para la mañana?Al segundo, contando hasta las seis de la mañana.
• ¿Cuánto falta para el fin de semana?Al segundo, contando hasta la medianoche del sábado.
• 在线倒计时在浏览器里倒数到任意日期，精确到秒。
• 离周一还有多久？精确到秒，倒数到周一零点。
• 离周二还有多久？精确到秒，倒数到周二零点。
• 离周三还有多久？精确到秒，倒数到周三零点。
• 离周四还有多久？精确到秒，倒数到周四零点。
• 离周五还有多久？精确到秒，倒数到周五零点。
• 离周六还有多久？精确到秒，倒数到周六零点。
• 离周日还有多久？精确到秒，倒数到周日零点。
• 离明天还有多久？今天还剩下的小时、分钟和秒。
• 离早上还有多久？精确到秒，倒数到早上六点。
• 离周末还有多久？精确到秒，倒数到周六零点。
• Contagem regressivaConte até qualquer data, ao segundo, dentro do seu navegador.
• Quanto falta para segunda-feira?Ao segundo, contando até a meia-noite de segunda.
• Quanto falta para terça-feira?Ao segundo, contando até a meia-noite de terça.
• Quanto falta para quarta-feira?Ao segundo, contando até a meia-noite de quarta.
• Quanto falta para quinta-feira?Ao segundo, contando até a meia-noite de quinta.
• Quanto falta para sexta-feira?Ao segundo, contando até a meia-noite de sexta.
• Quanto falta para sábado?Ao segundo, contando até a meia-noite de sábado.
• Quanto falta para domingo?Ao segundo, contando até a meia-noite de domingo.
• Quanto falta para amanhã?As horas, minutos e segundos que sobram de hoje.
• Quanto falta para de manhã?Ao segundo, contando até as seis da manhã.
• Quanto falta para o fim de semana?Ao segundo, contando até a meia-noite de sábado.
• ¿Cuánto falta para Navidad?Al segundo, contando hasta la medianoche del 25 de diciembre.
• ¿Cuánto falta para Halloween?Al segundo, contando hasta la medianoche del 31 de octubre.
• ¿Cuánto falta para Año Nuevo?Al segundo, contando hasta la medianoche del 1 de enero.

Nothing here matches that. The tools are small and single-purpose, so try the thing you have rather than the thing you want: csv, pdf, image, json, time.