Free Web Tools
A growing set of fast, private utilities that run entirely in your browser — what you enter never leaves your device. Built by Patrick Bushe.
CSS Prefers Contrast Query
Create prefers-contrast media query CSS for stronger borders and focus rings. A form can increase border contrast when the user requests more contrast.
Open ToolCSS Prefers Reduced Transparency
Preview fallback styles for users who prefer less transparent UI. A glass panel can switch to an opaque surface when reduced transparency is requested.
Open ToolCSS Print Color Adjust
Build print-color-adjust rules for preserving important printed backgrounds. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Print Page Break
Generate print-friendly break-before, break-after, and break-inside rules. Everything runs locally in your browser with nothing uploaded and no account needed.
Open ToolCSS Print Stylesheet
Build CSS print stylesheet in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolCSS Progress Style
Generate progress element track and value styles for loading and completion bars. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Pulse Keyframes
Build CSS pulse keyframes in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Radial Pattern
Build CSS radial pattern in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Radio Card Group
Build CSS radio card group in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolCSS Relative Color Syntax
Generate CSS relative color syntax in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolCSS Resizable Panel
Build CSS resizable panel in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Ribbon Label
Build CSS ribbon label in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Safe Area Insets
Reads the browser-provided inset for screen notches, rounded corners, and mobile UI edges, then lets CSS pad content away from those areas. In your browser.
Open ToolCSS Safe Width Wrapper
Generate max-width wrapper CSS with side padding and centered content. A docs page can keep prose readable while allowing comfortable side gutters.
Open ToolCSS Scope Preview
Preview CSS scope in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Scroll Margin
Create scroll-margin values for headings, cards, and targets reached by anchor links. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Scrollbar Gutter
Preview stable scrollbar gutter spacing for panels that should not jump when content overflows. Free and private in your browser, with nothing uploaded.
Open ToolCSS Search Input
Build CSS search input in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Section Divider
Build CSS section divider in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Segmented Control
Build CSS segmented control in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolCSS Selector SpecificityCompare
Build CSS selector specificitycompare in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no.
Open ToolCSS Selector Tester
Test CSS selector in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Settings Panel
Build CSS settings panel in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Sidebar Navigation
Build CSS sidebar navigation in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolCSS Skeleton Screen
Build CSS skeleton screen in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Skip Link
Build CSS skip link in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Sponsor Strip
Build CSS sponsor strip in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Stacking Context Inspector
Check CSS snippets for properties that create new stacking contexts with a live preview and one-click copy. Free and private — nothing is uploaded.
Open ToolCSS Starting Style Transition
Build @starting-style transitions for newly inserted dialogs, cards, and popovers. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Stat Card
Build CSS stat card in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Sticky Footer Layout
Build CSS sticky footer layout in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolCSS Sticky Table Header
Build CSS sticky table header in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolCSS Subgrid Layout
Build CSS subgrid layout in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Switch Group
Build CSS switch group in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS System Color Preview
Preview CSS system color in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Tab Size
Preview tab-size values for code blocks, logs, and pasted textareas. A code sample can render tabs as two spaces instead of eight columns. Runs in your browser.
Open ToolCSS Table Component
Build CSS table component in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Tabs Component
Build CSS tabs component in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS Tag Cloud
Build CSS tag cloud in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Tag Input
Build CSS tag input in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolCSS Target Selector
Generate :target styles for anchor-linked panels, headings, and in-page highlights. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS Text Decoration Skip Ink
Preview text-decoration-skip-ink for links, underlines, and editorial typography. A link underline can skip descenders so words remain easier to read.
Open ToolCSS Text Underline Offset
Generate underline thickness and offset CSS for links and nav items. A docs link can use a thicker underline placed four pixels below the text.
Open ToolCSS Timeline Component
Build CSS timeline component in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolCSS Touch Action
Create touch-action rules for maps, sliders, drawers, and canvas gestures. A horizontal carousel can allow pan-y so vertical page scroll still works.
Open ToolCSS Transition Property
Build transition-property lists with duration, easing, and delay controls. A button can animate color and transform while leaving width changes instant.
Open ToolCSS Triangle Generator
Free CSS triangle generator: make triangles with the border trick in any direction, size, and color, in your browser.
Open ToolCSS Unused Selector Checker
Check CSS unused selector in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS User Select
Build user-select rules for copyable code, draggable UI, and protected labels. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSS View Transition
Build CSS view transition in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCSS View Transition Name
Generate view-transition-name rules for page and component transitions with a live preview and one-click copy. Free and private — nothing is uploaded.
Open ToolCSS Wiggle Keyframes
Build CSS wiggle keyframes in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolCSS Window Chrome
Build CSS window chrome in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolCsv Column Picker
Pick CSV columns by name and output a smaller CSV with only those fields. A lead export can keep name, email, and company while dropping internal notes.
Open ToolCsv Dedupe Rows Tool
Remove duplicate CSV rows by selected key column and preview the remaining rows. A signup export can keep one row per email address before import.
Open ToolCSV Header Renamer
Free CSV header renamer that applies bulk old-to-new header pairs while leaving row data untouched. Clean export names locally in your browser.
Open ToolCSV Sort by Column
Free CSV sorter that orders rows by a selected column, ascending or descending. Handles numbers and text while preserving your header row locally.
Open ToolCSV To CSS Variable Table
Convert CSV to CSS variable table in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolCSV to HTML Table
Free CSV to HTML table converter: turn CSV data into a clean HTML table you can paste into a page, in your browser.
Open ToolCSV to JavaScript Array
Free CSV to JavaScript array converter that parses quoted commas, escaped quotes, multiline fields, headers, and row arrays in your browser.
Open ToolCsv To Markdown Table
Convert a small CSV snippet into a Markdown table with header and separator rows. Free and private in your browser, with nothing uploaded and no account.
Open ToolCSV to XML Converter
Free CSV to XML converter that parses quoted records, validates element names, escapes XML text, and names root and row nodes in your browser.
Open Toolcu inch to cu centimeter Converter
Free cu inch to cu centimeter converter with exact volume math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolCubic Equation Solver
Free cubic equation solver using the depressed-cubic method to find every real root from four coefficients, computed privately in your browser.
Open ToolCumulative GPA Calculator
Free cumulative GPA calculator: combine your prior GPA with a new semester into an overall GPA, in your browser.
Open ToolCurtain Panel Fullness Calculator
Calculate curtain fabric width from window width, fullness ratio, and panel count. It runs entirely in your browser — no uploads or accounts.
Open ToolDark Mode Palette Checker
Check dark mode palette in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolData Visualization Palette Builder
Build data visualization palette in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.
Open ToolDate Add / Subtract Calculator
Free date calculator: add or subtract days, weeks, months, or years from any date, computed locally in your browser.
Open ToolDay of the Year Calculator
Free day of the year calculator: find the ordinal day number, days remaining, and ISO week for any date, computed in your browser.
Open ToolDays in Month Calculator
Free days in month calculator: find how many days are in any month and year, accounting for leap years, computed in your browser.
Open ToolDecimal Hours Converter
Free decimal hours converter: switch between hours-and-minutes and decimal hours for timesheets, in your browser.
Open ToolDeck Board Calculator
Estimate deck boards from deck width, board width, gap, length, and waste percent. It runs entirely in your browser — no uploads or accounts.
Open ToolDelay Time Note Calculator
Calculate delay time from the quarter-note length and a note subdivision. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolDelete PDF Pages
Remove unwanted pages from a PDF in your browser and download the trimmed file. Your document is never uploaded, so it stays private on your device.
Open ToolDemo Show Rate Calculator
Estimate attended and no-show demos from the number booked and a show rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolDensity Calculator
Free density calculator: find density, mass, or volume from the other two with ρ = m/V, computed in your browser.
Open ToolDice Roller
Free online dice roller: roll any number of dice with any number of sides plus a modifier, with fair results generated in your browser.
Open ToolDigital Root Calculator
Free digital root calculator with labeled inputs and an immediate result. It reduces an integer through repeated digit sums privately in your browser.
Open ToolDMCA Notice Generator
Draft a DMCA takedown notice with owner details, infringing URL, original work description, contact details, signature, and statements in your browser.
Open ToolDNS Record Explainer
Free DNS record explainer that tokenizes zone-file syntax and labels owner, TTL, class, type, priority, target, and type fields in your browser.
Open ToolDockerfile Generator
Free Dockerfile generator that assembles a base image, work directory, dependency install, build, port, and JSON CMD with explicit steps in your browser.
Open ToolDomain Name Brainstormer
Free domain name brainstormer that combines keywords, prefixes, suffixes, and TLD ideas for practical naming sessions. Runs locally in your browser for...
Open ToolDoppler Effect Calculator
Calculate observed frequency for moving source and observer speeds with a signed classical Doppler model, evaluated privately in your browser.
Open ToolDot Product Calculator
Free dot product calculator that multiplies matching vector components, adds the products, and checks equal dimensions privately in your browser.
Open ToolDown Payment Calculator
Free down payment calculator: find the deposit and loan amount from a price and percentage, in your browser.
Open Tooldram to gram Converter
Free dram to gram converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolDuotone CSS Filter
Generate duotone CSS filter in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolDuplicate Word Finder
Free duplicate word finder locates accidental adjacent repeats and reports character positions. Runs in your browser; no uploads or accounts are used.
Open ToolEAN & UPC Check Digit
Free EAN-13 and UPC check digit calculator: enter the digits to compute or verify the barcode checksum, computed locally in your browser.
Open ToolEarly Payment Discount Calculator
Calculate an early-payment discount and the reduced amount due. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolEarnings Per Share Calculator
Free EPS calculator: find earnings per share from net income and shares outstanding, computed locally in your browser.
Open ToolEditorConfig Generator
Free EditorConfig generator that builds global charset and line rules plus per-pattern indentation sections with clear syntax locally in your browser.
Open ToolElastic Collision Calculator
Calculate both final velocities for a one-dimensional perfectly elastic collision from two masses and starting velocities in your browser safely now.
Open ToolEllipse Area Calculator
Free ellipse area calculator: find the area and approximate circumference from the two radii, in your browser.
Open ToolEmail Reply Count Calculator
Estimate the number of replies from emails sent and a reply rate. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolEnergy Converter
Free energy converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.
Open ToolENV Var Prefix Filter
Filter environment variable names by prefix and separate public from private-looking keys. Free and private in your browser, with nothing uploaded.
Open ToolEOQ Calculator
Free economic order quantity calculator: find the order size that minimizes total inventory cost, in your browser.
Open Toolerg to joule Converter
Free erg to joule converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolEscape Velocity Calculator
Calculate ideal escape speed from a spherical body using its mass and center radius, with the gravitational result computed privately in your browser.
Open ToolEULA Generator
Draft an end-user license agreement with app name, company, license type, permitted uses, restrictions, ownership, and termination text in your browser.
Open ToolEuler Totient Calculator
Free euler totient calculator that counts positive integers coprime to n, with labeled assumptions and an immediate result calculated privately in your browser.
Open ToolEV Charging Cost Calculator
Free ev charging cost calculator with labeled inputs and an immediate result. It estimates charging cost from energy and tariff privately in your browser.
Open ToolEV Charging Time Calculator
Free ev charging time calculator with labeled inputs and an immediate result. It estimates charging hours from energy and power privately in your browser.
Open ToolExpected Value Calculator
Free expected value calculator: find the mean outcome from values and their probabilities, in your browser.
Open ToolExponential Distribution Calculator
Free exponential distribution calculator with labeled inputs and an immediate result. It calculates waiting-time density and CDF privately in your browser.
Open ToolFahrenheit to Kelvin Converter
Convert Fahrenheit to kelvins and kelvins to Fahrenheit with the exact scale and offset formulas, with clear, precise results in your browser.
Open ToolFence Picket Calculator
Estimate fence pickets from run length, picket width, gap, gates, and waste with browser-only math. It runs locally in your browser with no uploads.
Open ToolFence Rail Board Calculator
Calculate fence rails and bundles from sections, rails per section, bundle size, and waste. It runs entirely in your browser, with no uploads or accounts.
Open ToolFertilizer NPK Calculator
Calculate fertilizer pounds needed from target nitrogen, product N percent, and lawn area. It runs entirely in your browser — no uploads or accounts.
Open ToolFetch Options
Work with fetch options in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.
Open ToolFind and Replace
Free find and replace tool: swap text with options for case-insensitive and regular-expression matching, in your browser.
Open ToolFlooring Calculator
Free flooring calculator: enter room area and the coverage per box to get how many boxes of flooring you need with waste, in your browser.
Open ToolFlour Grams to Cups Converter
Convert flour grams to US cups and cups to grams using a 120-gram baking convention, with recipe-ready decimal results calculated in your browser.
Open ToolFlow Rate Converter
Free flow rate converter: convert between litres per minute, cubic metres per hour, GPM, and CFM, in your browser.
Open ToolFollow-Up Email Sequence Planner
Free follow-up email sequence planner that maps timing, purpose, subject ideas, and message angles for polite outreach. Runs locally in your browser for...
Open Toolfoot-pound to joule Converter
Free foot-pound to joule converter with exact energy math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolForce Calculator (F = ma)
Free force calculator using Newton’s second law: solve force, mass, or acceleration from the other two, in your browser.
Open Toolfortnight to day Converter
Free fortnight to day converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolFour-Square Cipher
Free four-square cipher encodes digraphs with two keyed and two standard five-by-five squares. Runs in your browser; no uploads or accounts are used.
Open ToolFPS to MPH Converter
Convert feet per second to miles per hour and MPH back to FPS with six-significant-figure results, calculated privately in your browser on any device.
Open ToolFraction Simplifier
Free fraction simplifier that reduces an integer fraction to lowest terms. Review labeled assumptions and a worked result calculated privately in your browser.
Open ToolFreelance Hourly Rate Calculator
Free freelance rate calculator: find the hourly rate you need from income goal, billable hours, and expenses, in your browser.
Open ToolFuel Cost Calculator
Free fuel cost calculator: estimate the fuel cost of a trip from distance, fuel economy, and price, in your browser.
Open ToolFuel Savings Comparison
Compare annual fuel cost between two vehicle efficiencies from miles, fuel price, and MPG. It runs entirely in your browser — no uploads or accounts.
Open ToolFuture Value Calculator
Free future value calculator: project what a sum today grows to at a given rate over time, computed locally in your browser.
Open ToolGarage Epoxy Kit Calculator
Calculate epoxy kits from floor area, coats, kit coverage, and waste. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolGas Mileage Calculator
Free gas mileage calculator: find your fuel economy in MPG, km/L, and L/100km from miles and fuel used, in your browser.
Open ToolGear RPM Change Calculator
Calculate new engine RPM from old RPM and a new and old gear ratio. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolGenerator Sizing Calculator
Estimate generator wattage from running watts, largest starting surge, and reserve margin. It runs entirely in your browser — no uploads or accounts.
Open Toolgigabit to gigabyte Converter
Free gigabit to gigabyte converter with exact data math, reverse conversion, copy-ready output, and a quick reference table in your browser.
Open ToolGigabytes to Gibibytes Converter
Convert decimal gigabytes to binary gibibytes and gibibytes to gigabytes using exact byte definitions, with precise results in your browser.
Open ToolGit Commit Message
Work with git commit message in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.
Open ToolGitignore Pattern Tester
Supports common simple patterns such as folder ignores, wildcard file extensions, anchored paths, and negated rules. It is not a full Git implementation.
Open ToolGlassmorphism Generator
Free glassmorphism CSS generator: create frosted-glass cards with backdrop blur and transparency, in your browser.
Open ToolGlob To Regex
Build glob to regex in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.
Open ToolGlucose Unit Converter
Free glucose unit converter that converts glucose between mg/dL and mmol/L. Review labeled assumptions and a worked result calculated privately in your browser.
Open ToolGrams to Moles Calculator
Free grams to moles calculator: convert mass to moles using molar mass, computed in your browser.
Open ToolGraphql Fragment
Work with GraphQL fragment in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.
Open ToolGravel Calculator
Free gravel calculator: estimate how much gravel you need by area and depth, in cubic yards and tons, in your browser.
Open ToolGravitational Force Calculator
Free gravitational force calculator using Newton’s law of gravitation between two masses, in your browser.
Open ToolGronsfeld Cipher
Free Gronsfeld cipher shifts letters with a repeating numeric key and reverses the shifts. Runs in your browser; no uploads or accounts are used.
Open ToolGross Profit Calculator
Free gross profit calculator: find gross profit and gross margin from revenue and cost of goods, in your browser.
Open ToolGross to Net Hours Calculator
Free net hours calculator: subtract unpaid break time from gross hours to get paid hours, in your browser.
Open ToolGrouped Data Mean Calculator
Free grouped data mean calculator using class midpoints and frequencies to return the weighted total, sample count, and mean in your browser.
Open ToolHalf Birthday Calculator
Free half birthday calculator: find the date exactly six months from your birthday, computed in your browser.
Open ToolHalf-Life Calculator
Free half-life calculator: find how much of a substance remains after a time from its half-life, in your browser.
Open Toolhand to inch Converter
Free hand to inch converter with exact factors, reverse conversion, copy-ready output, and a quick reference table that runs in your browser.
Open ToolHashtag Extractor
Free hashtag extractor finds hash-prefixed Unicode words and returns one preserved tag per line. Runs in your browser; no uploads or accounts are used.
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