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Fast, private, and easy-to-use tools for calculations, finance, development, text, images, and conversions.
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Quick answers from tools people use most.
Calculate percentages, ratios, and percentage change in seconds.
Open toolUse a compact Apple-style keypad for everyday arithmetic.
Open toolUse an Android-style scientific keypad with advanced functions.
Open toolEstimate monthly loan payments, total interest, and total repayment.
Open toolEstimate payments, interest, fees, and savings from extra payments.
Open toolCompare new and old tax regimes for AY 2026β27 salaried income.
Open toolEstimate the future value of regular monthly investments.
Open toolFind an exact age in years, months, and days.
Open toolCalculate gold fineness, pure-gold weight, alloy weight, and value.
Open toolBuild an advanced GST invoice breakdown with tax splits and discounts.
Open toolEstimate body mass index and the standard BMI category.
Open toolProject compound growth with deposits and flexible compounding.
Open toolEstimate the monthly saving needed to reach a target.
Open toolCompare income, needs, wants, and savings in one view.
Open toolCalculate annualized investment growth between two values.
Open toolCalculate investment return, net gain or loss, and ROI percentage.
Open toolConvert metric and imperial length units instantly.
Open toolConvert Celsius, Fahrenheit, and Kelvin.
Open toolConvert a date and time and search times across every IANA time zone.
Open toolConvert speed between metric, imperial, nautical, and scientific units.
Open toolConvert joules, calories, watt-hours, kilowatt-hours, and BTU.
Open toolConvert fuel economy between consumption, efficiency, and MPG formats.
Open toolWrite integers and decimal digits as clear English words.
Open toolConvert whole numbers to canonical Roman numerals and back.
Open toolConvert major currencies using dated ECB reference exchange rates.
Open toolPick a color and control its alpha transparency.
Open toolDesign linear and radial gradients and copy their CSS.
Open toolConvert colors both ways between HEX and RGB.
Open toolCheck text contrast against WCAG AA and AAA thresholds.
Open toolFormat, minify, and validate JSON instantly.
Open toolTest regular expressions and inspect every match.
Open toolEncode or decode complete URLs and individual query components.
Open toolConvert exact integers between binary, octal, decimal, and hexadecimal.
Open toolConvert JSON objects into correctly escaped CSV rows.
Open toolConvert quoted CSV data into readable JSON objects.
Open toolCompare two JSON values and inspect changes by path.
Open toolValidate and format YAML with consistent indentation.
Open toolFormat SQL for PostgreSQL, MySQL, SQLite, and SQL Server.
Open toolBuild and validate standard five-field Unix cron expressions.
Open toolGenerate strong customizable passwords with secure browser randomness.
Open toolWrite Markdown and inspect a safe live HTML preview.
Open toolConvert dates into ISO, RFC, regional, and Unix timestamp formats.
Open toolGenerate and download a scannable PNG QR code locally.
Open toolPreview and download Base64-encoded PNG, JPEG, WebP, or GIF images.
Open toolReduce JPEG, PNG, and WebP file sizes locally.
Open toolRemove portrait and product backgrounds with private on-device AI.
Open toolCreate a colorful downloadable PNG from styled multiline text.
Open toolConvert a JPG, PNG, or WebP image into Base64 text locally.
Open toolCrop an image to a square, portrait, landscape, or custom aspect ratio.
Open toolRotate an image clockwise or counterclockwise and download the result.
Open toolFlip an image horizontally or vertically without uploading it.
Open toolConvert images between PNG, JPEG, WebP, and AVIF when supported.
Open toolConvert a PNG image to a compact JPG with a solid background.
Open toolConvert a WebP image to JPG or PNG in your browser.
Open toolConvert JPG or PNG images to modern WebP format locally.
Open toolConvert AVIF images to PNG, JPEG, or WebP when the browser can decode AVIF.
Open toolCount words, characters, sentences, and reading time.
Open toolSort lines alphabetically or naturally in ascending or descending order.
Open toolTurn titles into clean hyphenated or underscored URL slugs.
Open toolCompare two texts and identify changed lines side by side.
Open toolSort text items naturally from A to Z or Z to A.
Open toolOpen a WhatsApp chat by international number without saving a contact.
Open toolOpen a Telegram chat by international number without importing a contact.
Open toolMeasure exact keyword phrase frequency and density in page copy.
Open toolCreate escaped HTML title and meta description tags.
Open toolBuild Open Graph metadata for richer social link previews.
Open toolFind official public holidays by country and year.
Open toolCount weekdays between dates with optional holiday exclusions.
Open toolCheck current temperature, humidity, wind, and conditions by city.
Open toolView approximate location, ISP, and time-zone data for an IP.
Open toolSummarize public GitHub profile and repository statistics.
Open toolBrowse historical ECB reference rates between major currencies.
Open toolEstimate crypto trade profit, loss, return, and break-even price.
Open toolMap a date across Indian calendars and calculate the daily Panchang.
Open toolExplore
A growing library organized around the work you need to get done.
Everyday math made quick and understandable.
Plan money decisions with straightforward tools.
Format, inspect, and transform developer data.
Clean, count, and reshape text in seconds.
Analyze content and create search and social metadata.
Resize, compress, and convert images privately.
Convert common measurements accurately.
Fresh
The newest additions to our practical toolkit.
Find official public holidays by country and year.
Open toolCount weekdays between dates with optional holiday exclusions.
Open toolFind local sunrise and sunset times for a city and date.
Open toolCheck current temperature, humidity, wind, and conditions by city.
Open toolFind international telephone calling codes by country name.
Open toolFind cities, regions, and coordinates for supported postal codes.
Open toolBuilt for clarity
ToolStack gives you focused utilities without clutter, registration, or confusing workflows. Each tool includes a clear explanation, worked examples, and answers to common questions.
Calculations run directly in your browser whenever possible, helping keep your data private while delivering instant results on mobile, tablet, and desktop.