200 small tools in one repo. None of them upload a thing.
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Recently used
Text Tools
Count, clean, and reshape text
- Word & Character CounterCount words, characters, sentences, and reading time as you type.
- Case ConverterSwitch text between UPPER, lower, Title, and Sentence case.
- Text ReverserReverse text by character, word, or line.
- Duplicate Line RemoverStrip repeated lines from a block of text.
- Whitespace RemoverTrim extra spaces, tabs, and blank lines.
- Slug GeneratorTurn any title or phrase into a clean, URL-friendly slug.
- Line SorterSort lines alphabetically, by length, or numerically, and drop duplicates.
- Line NumbererAdd or remove line numbers on any block of text.
- Find and ReplaceFind and replace text in bulk, with case, whole-word, and regex options.
- Line Break RemoverRemove hard line breaks from text copied out of PDFs and emails.
- Text RepeaterRepeat any word, line, or emoji as many times as you need.
- Text ExtractorPull emails, links, phone numbers, dates, hashtags, or numbers out of any text.
- Character Frequency CounterSee how often every character appears in your text.
- Word Frequency CounterCount the most-used words in an article, essay, or transcript.
- Palindrome CheckerCheck whether a word, phrase, or number reads the same backwards.
- Anagram CheckerFind out whether two words or phrases are anagrams of each other.
- Text to Binary ConverterConvert text to binary, hex, decimal, or octal and back again.
- Morse Code TranslatorTranslate text to Morse code and Morse back to text.
- Number to Words ConverterWrite any number out in English words, as an ordinal, or in dollars and cents.
- Fancy Text GeneratorTurn plain text into bold, script, circled and other Unicode styles you can paste anywhere.
- Accent RemoverStrip accents and diacritics from text (é → e, ß → ss).
- Text WrapperWrap long lines at a set width, or unwrap hard-wrapped text.
Image Tools
Resize, compress, and convert images
- Image CompressorShrink image file size right in your browser.
- Image ResizerResize an image to exact pixel dimensions.
- Image to Base64Convert an image file into a Base64 data URL.
- Base64 to ImageTurn a Base64 string back into a downloadable image.
- Image Format ConverterConvert images between PNG, JPEG, and WebP.
- Image CropperCrop a photo to a square, 16:9, or any shape, with zoom and position.
- Image Rotator & FlipperRotate, tilt, and mirror an image, then download it.
- Image Filters & AdjustmentsAdjust brightness, contrast, saturation, blur and apply black-and-white, sepia and more.
- Image Color PickerPick any colour from an image and see its most common colours.
- Image WatermarkAdd a text watermark to a photo, with position, opacity, and tiling.
- Image Pixelator & CensorPixelate a whole image or hide a face, number, or address with a pixelated box.
- Favicon GeneratorMake favicon.ico and every PNG icon size from one image.
- Image Info & Metadata RemoverSee image details and hidden camera or GPS data, and save a clean copy.
Color Tools
Pick, convert, and pair colors
- Hex to RGB ConverterConvert hex color codes to RGB values.
- RGB to Hex ConverterConvert RGB values into a hex color code.
- Color Palette GeneratorGenerate a random harmonious color palette.
- Contrast CheckerCheck WCAG contrast ratio between two colors.
- Gradient GeneratorBuild a CSS linear gradient and copy the code.
- Color ConverterConvert colours between HEX, RGB, HSL, HSV, and CMYK, or look one up by name.
- Color Shades & Tints GeneratorGenerate lighter and darker shades of any colour as CSS variables.
- Color MixerBlend two colours together and get the mixed result.
- Color Harmony GeneratorBuild complementary, triadic, analogous and other colour schemes.
- Random Color GeneratorGenerate random colours, with pastel, vivid, and dark styles.
- Color Name FinderFind the closest named CSS colour to any colour.
- Color Blindness SimulatorSee how a colour looks with protanopia, deuteranopia, and tritanopia.
- Color Opacity CalculatorWork out the solid colour you get from a colour at a set opacity.
Conversion Tools
Units, pixels, and measurements
- Length ConverterConvert between metric and imperial length units.
- Weight ConverterConvert between kilograms, pounds, and more.
- Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin.
- Area ConverterConvert between square meters, feet, acres, and more.
- Pixel to EM ConverterConvert pixel values to em and rem units.
- Speed ConverterConvert between km/h, mph, m/s, knots, and Mach.
- Volume ConverterConvert litres, gallons, cups, tablespoons, cubic metres, and more.
- Time Unit ConverterConvert between seconds, minutes, hours, days, weeks, months, and years.
- Pressure ConverterConvert psi, bar, kPa, atm, and mmHg.
- Energy ConverterConvert joules, calories, kilowatt-hours, BTU, and more.
- Power ConverterConvert watts, kilowatts, horsepower, and BTU per hour.
- Angle ConverterConvert degrees, radians, gradians, and turns.
- Data Transfer Rate ConverterConvert Mbps to MB/s and between every bit and byte rate.
- Fuel Economy ConverterConvert MPG (US and UK), km/L, and L/100 km.
- Number Base ConverterConvert numbers between binary, octal, decimal, hex, and any base up to 36.
- Roman Numeral ConverterConvert numbers to Roman numerals and back, with validation.
- Cooking Measurement ConverterConvert cups, tablespoons, grams, and ounces, with ingredient-aware weights.
- Shoe Size ConverterConvert shoe sizes between US, UK, EU, and foot length.
- Aspect Ratio CalculatorFind the aspect ratio of any size and scale it to a new width or height.
- ASCII & Unicode ConverterConvert text to character codes and codes back to text.
Developer Tools
JSON, markup, and regex utilities
- JSON Formatter & ValidatorPretty-print, minify, and validate JSON.
- CSS MinifierStrip whitespace and comments from CSS.
- HTML MinifierCompact HTML markup for production.
- Regex TesterTest a regular expression against sample text live.
- SVG to HTMLConvert an SVG file into inline HTML markup.
- Diff CheckerCompare two blocks of text and see exactly what changed, line by line.
- HTML Entity Encoder / DecoderEscape or unescape HTML entities like & < and ©.
- Markdown PreviewWrite Markdown and see it rendered live, then copy the HTML.
- XML FormatterBeautify or minify XML and catch mismatched tags.
- SQL FormatterFormat SQL queries with clean indentation and capitalised keywords.
- CSS BeautifierTurn minified CSS back into readable, indented code.
- JavaScript MinifierRemove comments and whitespace from JavaScript to shrink it safely.
- JSON to TypeScript ConverterGenerate TypeScript interfaces from any JSON sample.
- Cron Expression ExplainerExplain a cron schedule in plain English and see its next run times.
- HTTP Status Code ReferenceSearch every HTTP status code with plain-English explanations.
- MIME Type LookupFind the MIME type for a file extension, or the extensions for a type.
- User Agent ParserDetect the browser, operating system, and device from a user-agent string.
- CSS Box Shadow GeneratorDesign a box shadow visually and copy the CSS.
- CSS Text Shadow GeneratorDesign a text shadow visually and copy the CSS.
- CSS Border Radius GeneratorRound each corner visually and copy the CSS.
- CSS Clamp GeneratorCreate fluid, responsive font sizes with CSS clamp().
- CSS Flexbox PlaygroundTry flexbox settings on live boxes and copy the CSS.
- URL ParserSplit a URL into protocol, host, path, query parameters, and fragment.
- Query String Parser & BuilderTurn a query string into key-value pairs or JSON, and build one from a list.
- Markdown Table GeneratorTurn spreadsheet rows or CSV into a neat Markdown table.
- JSON CompareCompare two JSON documents and list what was added, removed, or changed.
Calculator Tools
Money, health, and everyday math
- Percentage CalculatorWork out percentages, increases, and decreases.
- BMI CalculatorCalculate body mass index from height and weight.
- Tip CalculatorSplit a bill and calculate the tip per person.
- Loan / EMI CalculatorEstimate monthly loan payments and total interest.
- Discount CalculatorFind the sale price after a percentage discount.
- Compound Interest CalculatorSee how savings or investments grow with compound interest and monthly deposits.
- Mortgage CalculatorEstimate monthly mortgage payments with tax, insurance, and extra payments.
- Savings Goal CalculatorFind how long a savings goal will take, or how much to save each month.
- ROI CalculatorWork out return on investment and annualised growth.
- Profit Margin & Markup CalculatorCalculate profit margin and markup, or set a price from your cost.
- VAT / GST / Sales Tax CalculatorAdd tax to a price or take it out of a total in one step.
- Salary ConverterConvert pay between hourly, daily, weekly, monthly, and yearly.
- Inflation CalculatorSee what prices and savings are worth after years of inflation.
- Break-Even CalculatorFind how many units you must sell to cover your costs.
- Calorie CalculatorEstimate daily calorie needs from your age, size, and activity.
- Daily Water Intake CalculatorEstimate how much water you should drink each day.
- GPA CalculatorCalculate term and cumulative GPA from letter grades and credits.
- Final Grade CalculatorFind the score you need on a final exam to reach your target grade.
- Fraction CalculatorAdd, subtract, multiply, and divide fractions and mixed numbers.
- Statistics CalculatorMean, median, mode, standard deviation, and quartiles for any list of numbers.
- Ratio CalculatorSolve ratios and proportions, or check whether two ratios match.
- GCD & LCM CalculatorFind the greatest common divisor, least common multiple, and prime factors.
- Prime Number CheckerCheck if a number is prime, factor it, or list all primes up to a limit.
- Quadratic Equation SolverSolve ax² + bx + c = 0, including complex roots, and see the vertex.
Generator Tools
Passwords, IDs, and placeholder data
- Random Password GeneratorCreate strong, random passwords with custom rules.
- UUID GeneratorGenerate version 4 UUIDs in bulk.
- Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences, or words.
- QR Code GeneratorTurn any text or link into a scannable QR code.
- Random Number GeneratorGenerate random numbers within a custom range.
- Fake Data GeneratorGenerate placeholder names, emails, and addresses for testing.
- Random Name PickerPick one or more winners at random from a list of names.
- Dice RollerRoll any number of d4, d6, d8, d10, d12, d20, or d100 dice.
- Coin FlipFlip a coin once, or flip thousands and see the split.
- Lottery Number GeneratorGenerate random lottery tickets for any pick-and-range game.
- Username GeneratorGet memorable username ideas in several styles.
- Passphrase GeneratorCreate strong, memorable passphrases from random words, with a strength estimate.
- Random String GeneratorGenerate random strings and tokens from the characters you choose.
- PIN GeneratorGenerate random PINs and skip the easy-to-guess ones.
- Random Team GeneratorSplit a list of names into balanced random teams.
- Secret Santa GeneratorDraw Secret Santa pairs, with rules for who can't draw whom.
- Random Date GeneratorGenerate random dates in a range, with weekday-only and format options.
- Barcode GeneratorCreate EAN-13, UPC-A, and Code 39 barcodes and download them as SVG.
Security Tools
Hash, encode, and inspect tokens
- Hash GeneratorGenerate SHA-1, SHA-256, and SHA-512 hashes.
- Base64 Encoder / DecoderEncode or decode text using Base64.
- URL Encoder / DecoderEncode or decode text for safe use in URLs.
- Password Strength CheckerCheck how strong a password is and why.
- JWT DecoderDecode a JSON Web Token's header and payload.
- MD5 Hash GeneratorGenerate an MD5 hash of any text and compare it to a known hash.
- CRC32 Checksum CalculatorCalculate CRC-32 and Adler-32 checksums for text.
- HMAC GeneratorCreate HMAC-SHA1, SHA-256, SHA-384, or SHA-512 signatures with a secret key.
- AES Text EncryptorEncrypt and decrypt text with AES-256-GCM and a passphrase, all in your browser.
- TOTP Code GeneratorGenerate two-factor authentication codes from a Base32 secret.
- Caesar CipherEncrypt, decrypt, or brute-force a Caesar or ROT13 cipher.
- Vigenère CipherEncrypt and decrypt text with a Vigenère keyword cipher.
- Email Address ObfuscatorHide an email address from simple scrapers with HTML character encoding.
File Tools
Convert between file formats
- File to Base64Convert any file into a Base64-encoded string.
- CSV to JSONConvert CSV data into JSON.
- JSON to CSVConvert a JSON array into CSV.
- Text File MergerCombine multiple text files into one.
- File Size CalculatorConvert between bytes, KB, MB, GB, and TB.
- CSV Delimiter ConverterConvert between CSV, TSV, semicolon, and pipe-separated data.
- CSV Column ExtractorKeep only the CSV columns you need and drop duplicate rows.
- JSON to YAML ConverterConvert JSON to clean, readable YAML.
- Markdown to HTML ConverterConvert Markdown to HTML code, optionally as a full web page.
- HTML to Text ConverterStrip HTML down to clean readable text, keeping links and lists.
- File Hash CheckerGet MD5, SHA-1, SHA-256 and SHA-512 hashes of a file and check it against a published checksum.
- File Type DetectorFind out what a file really is by reading its first bytes, not its name.
- CSV Viewer & SorterView CSV as a table, search it, and sort by any column.
Time Tools
Dates, ages, and countdowns
- Age CalculatorCalculate exact age in years, months, and days.
- Date Difference CalculatorFind the number of days between two dates.
- Time Zone ConverterConvert a time between two time zones.
- Countdown TimerCount down to a date and time you choose.
- StopwatchA simple start, lap, and reset stopwatch.
- Unix Timestamp ConverterConvert Unix timestamps to dates and dates to timestamps, in seconds or milliseconds.
- Meeting Time PlannerFind meeting times that fall inside working hours in two or three time zones.
- Pomodoro TimerFocus sessions with short and long breaks, in a clean timer.
- Add or Subtract DatesAdd or subtract years, months, weeks, and days from any date.
- Business Days CalculatorCount working days between dates or find a date some working days away, skipping holidays.
- Week Number CalculatorFind the ISO week number of any date, or the dates of any week.
- Day of the Week FinderFind out which weekday any date falls on, past or future.
- Days Until CalculatorCount the days until (or since) any date or event.
- Time Card CalculatorAdd up shift hours with unpaid breaks, overtime, and gross pay.
- Pregnancy Due Date CalculatorEstimate a due date from the last period and see trimester dates.
- Sleep CalculatorFind bedtimes or wake-up times that line up with 90-minute sleep cycles.
- Time CalculatorAdd and subtract hours, minutes, and seconds.
- Date Format ConverterSee any date in ISO, US, UK, RFC 2822, ISO week and other formats.
- Leap Year CheckerCheck whether a year is a leap year and find the nearest ones.
- AI Sentiment AnalyzerAnalyze the emotional tone of a text as positive, negative, or neutral.
- AI Keyword ExtractorPull the most used keywords and phrases out of a block of text.
- Text SummarizerShrink long text to its key sentences.
- Readability AnalyzerScore reading ease and grade level with five classic readability formulas.
- Language DetectorIdentify the language or writing system of any text.
- Writing CheckerSpot repeated words, passive voice, long sentences, filler, and clichés.
- Emotion DetectorSee which emotions come through in a message, review, or post.
- Text Similarity CheckerCompare two texts and see how much they overlap.
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Questions
Are my files or text uploaded anywhere?
No. Every tool runs in your browser, so what you type and the files you open stay on your device. There is no server on our side to receive them.
Do I need an account?
No. There are no accounts. Open a tool and use it.
Does it work offline?
Mostly, yes. Once a tool has loaded it keeps working if your connection drops, because nothing needs the network after that.
Is it really free?
Yes. No subscription, no limits, no sign-up.
Where are my favorites stored?
In your browser, on this device only. Clearing your browser data removes them, and they do not follow you to other devices.
Do you track what I do?
No. Tool Repo has no accounts and no usage counting. Your theme, recent tools and favorites stay in this browser.
Social Media Tools
Plan, format, and preview your posts