# ToolKit Online

> Free online tools and calculators — no sign-up, no installation. Available in 6 languages (English, Italian, Spanish, French, German, Portuguese): replace /en/ in any URL with it, es, fr, de or pt.

All tools run in the browser. Every tool page includes a how-to article and an FAQ section.

## Finance & insurance calculators

- [VAT Calculator](https://toolkitonline.vip/en/tools/vat-calculator): Calculate VAT (Value Added Tax) quickly. Add or remove VAT from any amount.
- [Percentage Calculator](https://toolkitonline.vip/en/tools/percentage-calculator): Calculate percentages easily. Find percentage of a number, percentage increase, decrease and change.
- [Loan Calculator](https://toolkitonline.vip/en/tools/loan-calculator): Calculate monthly payments, total interest and amortization for any loan.
- [Salary Calculator](https://toolkitonline.vip/en/tools/salary-calculator): Calculate net salary from gross with tax bracket breakdown. See monthly and annual take-home pay.
- [Tip Calculator](https://toolkitonline.vip/en/tools/tip-calculator): Calculate tip amount and split the bill between multiple people easily.
- [Discount Calculator](https://toolkitonline.vip/en/tools/discount-calculator): Calculate the final price after discount and see how much you save.
- [Electricity Calculator](https://toolkitonline.vip/en/tools/electricity-calculator): Calculate electricity cost based on power consumption, usage time and rate.
- [Invoice Generator](https://toolkitonline.vip/en/tools/invoice-generator): Create simple invoices with sender, recipient, items, quantities and prices. Print or save.
- [Invoice Calculator](https://toolkitonline.vip/en/tools/invoice-calculator): Add line items, apply tax and discount (% or fixed), select currency (USD, EUR, GBP, JPY). Auto-calculate totals.
- [Mortgage Calculator](https://toolkitonline.vip/en/tools/mortgage-calculator): Calculate monthly mortgage payments with down payment, interest rate and loan term.
- [Currency Converter](https://toolkitonline.vip/en/tools/currency-converter): Convert between major world currencies instantly. USD, EUR, GBP, JPY and more.
- [Fuel Cost Calculator](https://toolkitonline.vip/en/tools/fuel-cost-calculator): Calculate trip fuel cost from distance, consumption (L/100km or MPG) and fuel price.
- [Compound Interest Calculator](https://toolkitonline.vip/en/tools/compound-interest-calculator): Calculate compound interest with regular contributions and see growth over time.
- [Investment Calculator](https://toolkitonline.vip/en/tools/investment-calculator): Project investment growth with initial amount, monthly contributions, and expected returns.
- [Paycheck Calculator](https://toolkitonline.vip/en/tools/paycheck-calculator): Calculate your net pay after taxes and deductions from your gross salary.
- [Profit Margin Calculator](https://toolkitonline.vip/en/tools/profit-margin-calculator): Calculate profit margin, markup, and gross profit from cost and revenue.
- [Sales Tax Calculator](https://toolkitonline.vip/en/tools/sales-tax-calculator): Calculate sales tax amount and total price from subtotal and tax rate.
- [ROI Calculator](https://toolkitonline.vip/en/tools/roi-calculator): Calculate Return on Investment (ROI) with net profit and annualized returns.
- [Amortization Schedule](https://toolkitonline.vip/en/tools/mortgage-amortization): Generate a full amortization schedule with monthly breakdown of principal and interest.
- [Inflation Calculator](https://toolkitonline.vip/en/tools/inflation-calculator): Calculate purchasing power over time and see how inflation affects your money.
- [Retirement Calculator](https://toolkitonline.vip/en/tools/retirement-calculator): Plan your retirement savings. Calculate total savings, inflation-adjusted value, and monthly retirement income based on your contributions and returns.
- [Debt Payoff Calculator](https://toolkitonline.vip/en/tools/debt-payoff-calculator): Calculate how long to pay off debt. See total interest, monthly breakdown, and how extra payments save you time and money.
- [Unit Price Calculator](https://toolkitonline.vip/en/tools/unit-price-calculator): Compare up to 5 products side by side. Calculate price per unit to find the best value and see how much you save.
- [Payroll Calculator](https://toolkitonline.vip/en/tools/payroll-calculator): Calculate net pay from gross salary. Estimate taxes, deductions, and take-home pay by pay period.
- [Simple Interest Calculator](https://toolkitonline.vip/en/tools/simple-interest-calculator): Calculate simple interest on loans or savings using the formula SI = P × R × T.
- [Auto Loan Calculator](https://toolkitonline.vip/en/tools/auto-loan-calculator): Calculate monthly car loan payments, total interest, and amortization schedule.
- [Tax Bracket Calculator](https://toolkitonline.vip/en/tools/tax-bracket-calculator): Calculate your federal income tax by bracket. See effective and marginal tax rates.
- [Savings Goal Calculator](https://toolkitonline.vip/en/tools/savings-goal-calculator): Plan your savings strategy. Set a goal amount and see how much to save monthly to reach it.
- [Tip Splitting Calculator](https://toolkitonline.vip/en/tools/tip-splitting-calculator): Split bills and tips among friends. Calculate each person's share with custom tip percentages.
- [Life Insurance Calculator](https://toolkitonline.vip/en/tools/life-insurance-calculator): Calculate how much life insurance coverage you need based on income, debts, and dependents.
- [Car Insurance Calculator](https://toolkitonline.vip/en/tools/car-insurance-calculator): Estimate your car insurance premium based on vehicle details, driver profile, and coverage preferences.
- [Home Insurance Calculator](https://toolkitonline.vip/en/tools/home-insurance-calculator): Estimate your homeowners insurance premium based on property value, location, and coverage needs.
- [Health Insurance Calculator](https://toolkitonline.vip/en/tools/health-insurance-calculator): Estimate monthly health insurance premiums based on age, family size, plan type, and income.
- [Disability Insurance Calculator](https://toolkitonline.vip/en/tools/disability-insurance-calculator): Calculate disability insurance coverage needs and estimated premiums based on income and occupation.
- [Renters Insurance Calculator](https://toolkitonline.vip/en/tools/renters-insurance-calculator): Estimate your renters insurance premium based on personal property value and coverage needs.
- [Pet Insurance Calculator](https://toolkitonline.vip/en/tools/pet-insurance-calculator): Estimate pet insurance costs based on pet type, age, breed, and coverage level.
- [Travel Insurance Calculator](https://toolkitonline.vip/en/tools/travel-insurance-calculator): Estimate travel insurance costs based on trip cost, destination, duration, and coverage type.
- [Umbrella Insurance Calculator](https://toolkitonline.vip/en/tools/umbrella-insurance-calculator): Calculate recommended umbrella insurance coverage based on assets, income, and risk factors.
- [Business Insurance Calculator](https://toolkitonline.vip/en/tools/business-insurance-calculator): Estimate business insurance premiums based on revenue, employees, industry, and coverage type.
- [Flood Insurance Calculator](https://toolkitonline.vip/en/tools/flood-insurance-calculator): Estimate flood insurance premiums based on property value, flood zone, and elevation.
- [Motorcycle Insurance Calculator](https://toolkitonline.vip/en/tools/motorcycle-insurance-calculator): Estimate motorcycle insurance premiums based on bike value, engine size, and rider experience.
- [Boat Insurance Calculator](https://toolkitonline.vip/en/tools/boat-insurance-calculator): Estimate boat insurance premiums based on boat value, type, length, and usage.
- [Dental Insurance Calculator](https://toolkitonline.vip/en/tools/dental-insurance-calculator): Estimate dental insurance costs and savings based on expected dental procedures and coverage type.
- [Vision Insurance Calculator](https://toolkitonline.vip/en/tools/vision-insurance-calculator): Estimate vision insurance costs and savings for eye exams, glasses, and contact lenses.
- [Long-Term Care Insurance Calculator](https://toolkitonline.vip/en/tools/long-term-care-insurance-calculator): Estimate long-term care insurance premiums based on age, coverage amount, and benefit period.
- [Critical Illness Insurance Calculator](https://toolkitonline.vip/en/tools/critical-illness-insurance-calculator): Estimate critical illness insurance premiums for coverage against cancer, heart attack, and stroke.
- [Wedding Insurance Calculator](https://toolkitonline.vip/en/tools/wedding-insurance-calculator): Estimate wedding insurance premiums based on total wedding budget and coverage needs.
- [Jewelry Insurance Calculator](https://toolkitonline.vip/en/tools/jewelry-insurance-calculator): Estimate jewelry insurance premiums based on appraised value and coverage type.
- [GAP Insurance Calculator](https://toolkitonline.vip/en/tools/gap-insurance-calculator): Calculate GAP insurance coverage to bridge the difference between car value and loan balance.
- [FIRE Number Calculator](https://toolkitonline.vip/en/tools/fire-number-calculator): Calculate your Financial Independence Retire Early (FIRE) number and years to reach it.
- [Net Worth Calculator](https://toolkitonline.vip/en/tools/net-worth-calculator): Calculate your total net worth by adding assets and subtracting liabilities.
- [Emergency Fund Calculator](https://toolkitonline.vip/en/tools/emergency-fund-calculator): Calculate how much you need in your emergency fund based on monthly expenses and employment type.
- [Capital Gains Tax Calculator](https://toolkitonline.vip/en/tools/capital-gains-calculator): Calculate capital gains tax on investments including federal and state tax rates.
- [Self-Employment Tax Calculator](https://toolkitonline.vip/en/tools/self-employment-tax-calculator): Calculate self-employment tax, income tax, and quarterly estimated payments for freelancers.
- [Estate Tax Calculator](https://toolkitonline.vip/en/tools/estate-tax-calculator): Estimate federal estate tax liability based on total estate value, deductions, and exemptions.
- [Social Security Calculator](https://toolkitonline.vip/en/tools/social-security-calculator): Estimate your Social Security retirement benefits based on earnings history and retirement age.
- [Insurance Deductible Calculator](https://toolkitonline.vip/en/tools/insurance-deductible-calculator): Compare insurance deductible options and calculate potential savings from higher deductibles.
- [HSA Calculator](https://toolkitonline.vip/en/tools/hsa-calculator): Project your Health Savings Account growth with tax savings and investment returns over time.
- [401(k) Calculator](https://toolkitonline.vip/en/tools/401k-calculator): Project your 401(k) retirement savings with employer matching, contributions, and investment growth.

## Text & writing tools

- [Word Counter](https://toolkitonline.vip/en/tools/word-counter): Count words, characters, sentences, and paragraphs in your text instantly.
- [Lorem Ipsum Generator](https://toolkitonline.vip/en/tools/lorem-ipsum-generator): Generate lorem ipsum placeholder text paragraphs for your designs and mockups.
- [Text Case Converter](https://toolkitonline.vip/en/tools/text-case-converter): Convert text between uppercase, lowercase, title case, camelCase, kebab-case and more.
- [Character Counter](https://toolkitonline.vip/en/tools/character-counter): Detailed character analysis: vowels, consonants, digits, spaces, special characters and more.
- [Text to Slug](https://toolkitonline.vip/en/tools/text-to-slug): Convert any text to a URL-friendly slug. Removes accents, special characters, spaces to hyphens.
- [Markdown Preview](https://toolkitonline.vip/en/tools/markdown-preview): Write markdown on the left, see rendered HTML on the right. Live preview.
- [HTML Encoder](https://toolkitonline.vip/en/tools/html-encoder): Encode and decode HTML entities. Convert special characters to HTML entities and back.
- [Text Diff](https://toolkitonline.vip/en/tools/text-diff): Compare two texts side by side and highlight the differences line by line.
- [Typing Speed Test](https://toolkitonline.vip/en/tools/typing-speed-test): Test your typing speed in words per minute (WPM) with real-time accuracy tracking and detailed performance stats.
- [Character Map](https://toolkitonline.vip/en/tools/character-map): Browse and copy Unicode characters, symbols, emojis with code details.
- [Text to Speech](https://toolkitonline.vip/en/tools/text-to-speech): Convert text to speech using your browser. Adjust voice, speed and pitch.
- [Grammar Checker](https://toolkitonline.vip/en/tools/grammar-checker): Check your text for spelling, grammar and style errors. Get instant suggestions and fix mistakes with one click.
- [Resume Builder](https://toolkitonline.vip/en/tools/resume-builder): Create professional resumes with multiple templates, color themes, and export options. Free, no signup.
- [AI Text Detector](https://toolkitonline.vip/en/tools/ai-text-detector): Analyze text for AI-generated patterns. Heuristic checks for sentence uniformity, vocabulary diversity, and more.
- [Text Repeater](https://toolkitonline.vip/en/tools/text-repeater): Repeat any text up to 10,000 times with custom separators, line numbers, and reverse options.
- [Emoji Picker](https://toolkitonline.vip/en/tools/emoji-picker): Search, browse and copy emojis by category. View emoji names, Unicode code points and HTML entities.
- [Word Frequency Counter](https://toolkitonline.vip/en/tools/word-frequency-counter): Analyze word frequency in any text. See counts, percentages, bar chart, and export as CSV.
- [Line Counter](https://toolkitonline.vip/en/tools/line-counter): Count total lines, blank lines, non-blank lines. See longest/shortest line and average line length.
- [Note Taking](https://toolkitonline.vip/en/tools/note-taking): Simple online notepad with multiple tabs, auto-save, search, word count, and export options.
- [Flashcard Maker](https://toolkitonline.vip/en/tools/flashcard-maker): Create flashcards with front and back. Study mode with reveal, shuffle, and track known vs unknown. Multiple decks, localStorage save, import/export JSON.
- [Font Identifier](https://toolkitonline.vip/en/tools/font-identifier): Preview and compare 30+ fonts. Type sample text, adjust size, spacing, and color. Side-by-side font comparison with CSS code copy.
- [Reading Time Calculator](https://toolkitonline.vip/en/tools/reading-time-calculator): Estimate how long it takes to read any text. Paste your content and get instant reading time.

## Health & fitness calculators

- [BMI Calculator](https://toolkitonline.vip/en/tools/bmi-calculator): Calculate your Body Mass Index (BMI) and find out your weight category with metric and imperial units.
- [Calorie Calculator](https://toolkitonline.vip/en/tools/calorie-calculator): Calculate your daily calorie needs based on age, gender, weight, height and activity level using the Mifflin-St Jeor equation.
- [Body Fat Calculator](https://toolkitonline.vip/en/tools/body-fat-calculator): Estimate your body fat percentage using the U.S. Navy method with simple measurements.
- [Ideal Weight Calculator](https://toolkitonline.vip/en/tools/ideal-weight-calculator): Calculate your ideal weight range based on height, age, and gender using multiple formulas.
- [Water Intake Calculator](https://toolkitonline.vip/en/tools/water-intake-calculator): Calculate your recommended daily water intake based on weight, activity, and climate.
- [Sleep Calculator](https://toolkitonline.vip/en/tools/sleep-calculator): Calculate optimal bedtime or wake time based on 90-minute sleep cycles.
- [Pregnancy Calculator](https://toolkitonline.vip/en/tools/pregnancy-calculator): Calculate your due date from last menstrual period or conception date with trimester timeline.
- [Pace Calculator](https://toolkitonline.vip/en/tools/pace-calculator): Calculate running or walking pace, finish time, or distance with split times.
- [Breathing Exercise](https://toolkitonline.vip/en/tools/breathing-exercise): Guided breathing timer with animated visuals. Preset patterns: 4-7-8 Relaxation, Box Breathing, Calm and Energizing modes.
- [Noise Generator](https://toolkitonline.vip/en/tools/noise-generator): Generate white, pink, and brown noise for focus, sleep, and relaxation. Mix types, set timers, and visualize waveforms.
- [Blood Pressure Tracker](https://toolkitonline.vip/en/tools/blood-pressure-tracker): Track and classify your blood pressure readings. Log history, view charts, calculate averages, and export CSV.
- [TDEE Calculator](https://toolkitonline.vip/en/tools/tdee-calculator): Calculate your Total Daily Energy Expenditure based on age, weight, height, and activity level.
- [Macro Calculator](https://toolkitonline.vip/en/tools/macro-calculator): Calculate your daily macronutrient needs: protein, carbs, and fat based on your goals.
- [Ovulation Calculator](https://toolkitonline.vip/en/tools/ovulation-calculator): Calculate your fertile window and estimated ovulation date based on your menstrual cycle.
- [Blood Alcohol Calculator](https://toolkitonline.vip/en/tools/blood-alcohol-calculator): Estimate your blood alcohol content (BAC) based on weight, drinks, and time.
- [Bra Size Calculator](https://toolkitonline.vip/en/tools/bra-size-calculator): Find your perfect bra size using band and bust measurements. Convert between US, UK, and EU sizes.
- [Heart Rate Zone Calculator](https://toolkitonline.vip/en/tools/heart-rate-zone-calculator): Calculate your heart rate training zones based on your max heart rate or resting heart rate.

## Converters & file tools

- [Unit Converter](https://toolkitonline.vip/en/tools/unit-converter): Convert between units of length, weight, temperature and speed. Metric to imperial and more.
- [Base64 Converter](https://toolkitonline.vip/en/tools/base64-converter): Encode or decode Base64 strings instantly. Convert text to Base64 and back.
- [Time Zone Converter](https://toolkitonline.vip/en/tools/time-zone-converter): Convert time between different time zones worldwide. Quick and accurate.
- [Cooking Converter](https://toolkitonline.vip/en/tools/cooking-converter): Convert between cooking measurements: cups, tablespoons, teaspoons, ml, oz, grams.
- [CSV to JSON](https://toolkitonline.vip/en/tools/csv-to-json): Convert CSV data to JSON format and vice versa. Paste and convert instantly.
- [JSON to CSV](https://toolkitonline.vip/en/tools/json-to-csv): Convert JSON arrays to CSV format. Flatten nested objects, choose delimiters, and download results.
- [URL Encoder/Decoder](https://toolkitonline.vip/en/tools/url-encoder): Encode or decode URLs and query strings for safe web use.
- [JPG to PDF](https://toolkitonline.vip/en/tools/jpg-to-pdf): Convert multiple images (JPG, PNG, WebP) to a single PDF document. Reorder, configure page size and orientation.
- [PDF to JPG](https://toolkitonline.vip/en/tools/pdf-to-jpg): Convert images (PNG, WebP, BMP, GIF, SVG, TIFF) to JPG format. Batch conversion with quality control, entirely in your browser.
- [Word to PDF](https://toolkitonline.vip/en/tools/word-to-pdf): Convert text to PDF with formatting options. Rich text editor with bold, italic, headings, lists and alignment. Choose page size, orientation and margins.
- [Number to Words](https://toolkitonline.vip/en/tools/number-to-words): Convert any number to its written form in English. Supports decimals, negatives, ordinals, and currency mode.
- [Temperature Converter](https://toolkitonline.vip/en/tools/temperature-converter): Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly. Visual thermometer, formulas and reference points.
- [PDF Merge](https://toolkitonline.vip/en/tools/pdf-merge): Merge multiple images into a single PDF document. Upload images, reorder pages, choose orientation, and download the combined PDF.
- [PDF Compress](https://toolkitonline.vip/en/tools/pdf-compress): Compress images and export as a lightweight PDF. Adjust quality, preview compression results, and download an optimized PDF file.
- [Image to Text](https://toolkitonline.vip/en/tools/image-to-text): Analyze images to extract dimensions, file info, and dominant color palette. Upload any image to get detailed metadata and color analysis.
- [Text to Morse](https://toolkitonline.vip/en/tools/text-to-morse): Convert text to Morse code and Morse code back to text. Visual dots and dashes display, audio playback with speed control, supports letters, numbers and punctuation.
- [HTML to Markdown](https://toolkitonline.vip/en/tools/html-to-markdown): Convert HTML to Markdown instantly. Supports headings, links, images, lists, tables, code blocks and more.
- [World Clock](https://toolkitonline.vip/en/tools/world-clock): View current time in multiple time zones simultaneously. Add custom timezones, toggle 12h/24h format, see UTC offsets.
- [Shoe Size Converter](https://toolkitonline.vip/en/tools/shoe-size-converter): Convert shoe sizes between US, UK, EU, and CM. Find your perfect shoe size in any system.

## Developer & web tools

- [JSON Formatter](https://toolkitonline.vip/en/tools/json-formatter): Format, validate and beautify JSON data. Minify or pretty-print JSON.
- [Color Picker](https://toolkitonline.vip/en/tools/color-picker): Pick colors and convert between HEX, RGB, and HSL formats.
- [Password Generator](https://toolkitonline.vip/en/tools/password-generator): Generate strong, secure random passwords with custom length, uppercase, lowercase, numbers and symbols.
- [QR Code Generator](https://toolkitonline.vip/en/tools/qr-code-generator): Generate QR codes from text, URLs, WiFi, vCards and more. Customize colors and size, then download as PNG image.
- [Barcode Generator](https://toolkitonline.vip/en/tools/barcode-generator): Generate Code 128 barcodes from text. Customize and download as PNG.
- [Screen Resolution](https://toolkitonline.vip/en/tools/screen-resolution): Display your screen resolution, viewport size, pixel ratio, orientation and more.
- [Screen Recorder](https://toolkitonline.vip/en/tools/screen-recorder): Record your screen directly in the browser. Start, stop, pause recording with video preview and WebM download.
- [Regex Tester](https://toolkitonline.vip/en/tools/regex-tester): Test regular expressions with real-time matching, highlighting and group capture.
- [Hex Converter](https://toolkitonline.vip/en/tools/hex-converter): Convert between decimal, hexadecimal, binary and octal number systems.
- [Hash Generator](https://toolkitonline.vip/en/tools/hash-generator): Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text input.
- [Binary Converter](https://toolkitonline.vip/en/tools/binary-converter): Convert between binary, decimal, hexadecimal, and octal number systems.
- [Binary Translator](https://toolkitonline.vip/en/tools/binary-translator): Translate text to binary code and binary code to text. Also shows octal and decimal representations.
- [Color Converter](https://toolkitonline.vip/en/tools/color-converter): Convert colors between HEX, RGB, and HSL formats with live preview.
- [IP Lookup](https://toolkitonline.vip/en/tools/ip-lookup): Display your public IP address with geolocation info including city, country, and ISP.
- [Cron Expression Generator](https://toolkitonline.vip/en/tools/cron-expression-generator): Generate and explain cron expressions visually with presets and next run preview.
- [Timestamp Converter](https://toolkitonline.vip/en/tools/timestamp-converter): Convert Unix/Epoch timestamps to human-readable dates and vice versa. Live current timestamp, multiple formats, relative time.
- [Color Palette Generator](https://toolkitonline.vip/en/tools/color-palette-generator): Generate beautiful color palettes with harmony modes, contrast checking, and CSS export.
- [Internet Speed Test](https://toolkitonline.vip/en/tools/internet-speed-test): Check your connection info, downlink speed, latency, IP address and network type with visual speed gauge.
- [Keyboard Tester](https://toolkitonline.vip/en/tools/keyboard-tester): Test every key on your keyboard. Visual keyboard layout highlights pressed keys, shows key codes, and tracks total keypresses.
- [Mic Test](https://toolkitonline.vip/en/tools/mic-test): Test your microphone online. Check volume levels, view waveform, record a test clip, and verify your mic works before calls or recordings.
- [Webcam Test](https://toolkitonline.vip/en/tools/webcam-test): Test your webcam online. Live video preview, take snapshots, check resolution and FPS, mirror toggle. Verify camera works before video calls.
- [Gradient Generator](https://toolkitonline.vip/en/tools/gradient-generator): Create beautiful CSS gradients visually. Choose linear or radial, add color stops, adjust angles, preview live, and copy CSS code.
- [XML Formatter](https://toolkitonline.vip/en/tools/xml-formatter): Format, validate, beautify and minify XML data. Pretty-print with configurable indentation or compress XML.
- [JS Minifier](https://toolkitonline.vip/en/tools/js-minifier): Minify JavaScript code by removing comments, whitespace, and newlines. See size savings, copy output, and download as .min.js.
- [WiFi QR Generator](https://toolkitonline.vip/en/tools/wifi-qr-generator): Generate a QR code for your WiFi network. Guests scan to connect instantly. Supports WPA/WPA2, WEP, and open networks.
- [CSS Minifier](https://toolkitonline.vip/en/tools/css-minifier): Minify and beautify CSS code online. Remove comments, whitespace, and optimize stylesheets for production.
- [Color Contrast Checker](https://toolkitonline.vip/en/tools/color-contrast-checker): Check WCAG 2.1 color contrast ratios. Get Pass/Fail badges for AA and AAA levels with accessible alternatives.
- [Text Encryptor](https://toolkitonline.vip/en/tools/text-encryptor): Encrypt and decrypt text with AES-256-GCM. Password-based encryption using PBKDF2 key derivation, entirely in your browser.
- [Subnet Calculator](https://toolkitonline.vip/en/tools/subnet-calculator): Calculate network address, broadcast address, host range and more from IP and subnet mask.
- [SQL Formatter](https://toolkitonline.vip/en/tools/sql-formatter): Format and beautify SQL queries. Supports SELECT, INSERT, UPDATE, DELETE and more.
- [YAML Formatter](https://toolkitonline.vip/en/tools/yaml-formatter): Format, validate, and beautify YAML. Convert between YAML and JSON formats.

## Math & time tools

- [Age Calculator](https://toolkitonline.vip/en/tools/age-calculator): Calculate your exact age in years, months and days. See total days lived and countdown to next birthday.
- [Speed Calculator](https://toolkitonline.vip/en/tools/speed-calculator): Calculate speed, distance or time from any two values. Simple and quick.
- [Date Calculator](https://toolkitonline.vip/en/tools/date-calculator): Calculate days between two dates or add/subtract days from a date.
- [Random Number Generator](https://toolkitonline.vip/en/tools/random-number-generator): Generate random numbers with min, max, quantity options and no-duplicate mode.
- [Aspect Ratio Calculator](https://toolkitonline.vip/en/tools/aspect-ratio-calculator): Calculate height for common aspect ratios (16:9, 4:3, 1:1, 21:9) or enter a custom ratio.
- [Grade Calculator](https://toolkitonline.vip/en/tools/grade-calculator): Enter grades with weights to calculate weighted average and GPA.
- [Countdown Timer](https://toolkitonline.vip/en/tools/countdown-timer): Set a target date and see a live countdown in days, hours, minutes and seconds.
- [Fraction Calculator](https://toolkitonline.vip/en/tools/fraction-calculator): Add, subtract, multiply and divide fractions with step-by-step solutions.
- [GPA Calculator](https://toolkitonline.vip/en/tools/gpa-calculator): Calculate your Grade Point Average from courses, credits, and letter grades.
- [Scientific Calculator](https://toolkitonline.vip/en/tools/scientific-calculator): Full-featured scientific calculator with trigonometry, logarithms, and advanced functions.
- [Stopwatch](https://toolkitonline.vip/en/tools/stopwatch): Online stopwatch with lap times, split tracking, and millisecond precision.
- [Percentage Change Calculator](https://toolkitonline.vip/en/tools/percentage-change-calculator): Calculate percentage increase or decrease between two values instantly.
- [Pomodoro Timer](https://toolkitonline.vip/en/tools/pomodoro-timer): Focus timer using the Pomodoro Technique: 25-minute work sessions with short and long breaks.
- [Habit Tracker](https://toolkitonline.vip/en/tools/habit-tracker): Track daily and weekly habits with streaks, calendar heatmap, and completion stats. Build better routines visually.
- [Standard Deviation Calculator](https://toolkitonline.vip/en/tools/standard-deviation-calculator): Calculate standard deviation, variance, mean, median, and more. Enter numbers and get complete statistical analysis instantly.
- [Matrix Calculator](https://toolkitonline.vip/en/tools/matrix-calculator): Perform matrix operations: add, subtract, multiply, transpose, determinant, and scalar multiply. Support for 2x2 and 3x3 matrices.
- [Probability Calculator](https://toolkitonline.vip/en/tools/probability-calculator): Calculate probabilities for single events, combined events, conditional probability, and permutations/combinations with step-by-step formulas.
- [Chart Maker](https://toolkitonline.vip/en/tools/chart-maker): Create bar, line, and pie charts from your data. Enter label:value pairs, customize colors and titles, then download as PNG.
- [Area Calculator](https://toolkitonline.vip/en/tools/area-calculator): Calculate the area of any shape: circle, rectangle, triangle, trapezoid, ellipse, parallelogram. With formulas, SVG preview, and unit conversion.
- [Binary Calculator](https://toolkitonline.vip/en/tools/binary-calculator): Perform binary operations: AND, OR, XOR, NOT, addition and subtraction with bit visualization and step-by-step results.
- [Volume Calculator](https://toolkitonline.vip/en/tools/volume-calculator): Calculate volume and surface area of 3D shapes: cube, rectangular prism, sphere, cylinder, cone, pyramid. Multiple units.
- [Roman Numeral Converter](https://toolkitonline.vip/en/tools/roman-numeral-converter): Convert between Roman numerals and decimal numbers. Supports values 1-3999 with input validation, reference table, and conversion history.
- [Square Root Calculator](https://toolkitonline.vip/en/tools/square-root-calculator): Calculate square roots, cube roots, and nth roots of any number with precision control.
- [Pythagorean Theorem Calculator](https://toolkitonline.vip/en/tools/pythagorean-theorem-calculator): Calculate the missing side of a right triangle using a² + b² = c². Find area and perimeter too.
- [Quadratic Equation Solver](https://toolkitonline.vip/en/tools/quadratic-equation-solver): Solve quadratic equations ax² + bx + c = 0. Get real and complex roots with step-by-step solution.

## Image tools

- [Image Compressor](https://toolkitonline.vip/en/tools/image-compressor): Compress images client-side. Upload, adjust quality, download compressed image.
- [Image Resizer](https://toolkitonline.vip/en/tools/image-resizer): Resize images to exact dimensions, by percentage, or social media presets. Client-side processing, no uploads.
- [Photo Editor](https://toolkitonline.vip/en/tools/photo-editor): Edit photos in your browser. Adjust brightness, contrast, apply filters, rotate, flip, crop and download.
- [Pixel Ruler](https://toolkitonline.vip/en/tools/pixel-ruler): Measure pixel distances on screen with an interactive ruler and manual calculator.
- [Meme Generator](https://toolkitonline.vip/en/tools/meme-generator): Create custom memes with top and bottom text. Upload images or use templates. Adjust font, colors, alignment and download as PNG.
- [Pixel Art Maker](https://toolkitonline.vip/en/tools/pixel-art-maker): Create pixel art in your browser. Draw, erase, fill, undo, and download as PNG. Grid sizes: 8x8, 16x16, 32x32.
- [Background Remover](https://toolkitonline.vip/en/tools/background-remover): Remove image backgrounds with one click. Click on the background color to make it transparent. Adjust tolerance, preview result, and download as PNG.
- [SVG to PNG](https://toolkitonline.vip/en/tools/svg-to-png): Convert SVG to PNG image. Upload or paste SVG code, choose scale, background color, and download high-quality PNG.
- [Whiteboard](https://toolkitonline.vip/en/tools/whiteboard): Free online whiteboard with brush, eraser, colors, undo, grid and PNG download.
- [Placeholder Image Generator](https://toolkitonline.vip/en/tools/placeholder-image-generator): Generate custom placeholder images with custom dimensions, colors, and text. Download as PNG/JPEG or copy as base64 data URL.
- [Photo Collage Maker](https://toolkitonline.vip/en/tools/photo-collage-maker): Create beautiful photo collages online. Choose layouts, add photos, and download your collage.

## Energy & sustainability calculators

- [Solar Panel ROI Calculator](https://toolkitonline.vip/en/tools/solar-panel-roi-calculator): Calculate the return on investment for your solar panel installation over 25 years.
- [Solar Savings Calculator](https://toolkitonline.vip/en/tools/solar-savings-calculator): Estimate how much you can save on electricity bills with solar panels based on your roof and usage.
- [EV vs Gas Cost Calculator](https://toolkitonline.vip/en/tools/ev-vs-gas-calculator): Compare the total ownership cost of an electric vehicle vs a gas car including fuel and maintenance.
- [Carbon Footprint Calculator](https://toolkitonline.vip/en/tools/carbon-footprint-calculator): Calculate your annual carbon footprint from electricity, gas, car, and air travel.
- [Heat Pump Savings Calculator](https://toolkitonline.vip/en/tools/heat-pump-calculator): Calculate annual savings from switching to a heat pump for home heating and cooling.
- [Solar Battery Size Calculator](https://toolkitonline.vip/en/tools/solar-battery-calculator): Calculate the battery storage capacity you need for your solar energy system.
- [Wind Turbine Calculator](https://toolkitonline.vip/en/tools/wind-turbine-calculator): Calculate energy production, savings, and payback period for a residential wind turbine.
- [EV Charging Cost Calculator](https://toolkitonline.vip/en/tools/ev-charging-cost-calculator): Compare home vs public EV charging costs and calculate annual charging expenses.
- [EV Range Calculator](https://toolkitonline.vip/en/tools/ev-range-calculator): Estimate real-world electric vehicle range based on battery size, efficiency, and conditions.
- [EV Savings Calculator](https://toolkitonline.vip/en/tools/ev-savings-calculator): Calculate total savings from switching to an electric vehicle including fuel, maintenance, and incentives.
- [Electric Bike Savings Calculator](https://toolkitonline.vip/en/tools/electric-bike-savings-calculator): Calculate savings from commuting by e-bike instead of car including fuel and payback period.
- [Home Energy Audit Calculator](https://toolkitonline.vip/en/tools/home-energy-audit-calculator): Analyze your home energy costs and identify potential savings based on home size and age.
- [Insulation ROI Calculator](https://toolkitonline.vip/en/tools/insulation-roi-calculator): Calculate the return on investment from home insulation upgrades including payback period.
- [LED Lighting Savings Calculator](https://toolkitonline.vip/en/tools/led-savings-calculator): Calculate savings from switching to LED bulbs including energy reduction and payback period.
- [Smart Thermostat Savings Calculator](https://toolkitonline.vip/en/tools/smart-thermostat-calculator): Calculate savings from installing a smart thermostat for your home HVAC system.

## Optional

- [Blog](https://toolkitonline.vip/en/blog): guides and how-to articles