All Tools
Browse all 37 free online tools — calculators, converters, formatters, and validators. Every tool runs entirely in your browser, is free to use, and needs no sign-up.
Calculators
View categoryAge Calculator
Calculate your exact age in years, months, and days instantly. Find out how old you are and when your next birthday is with our free online age calculator.
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Percentage Calculator
Calculate percentages quickly and easily. Find X% of Y, what percent X is of Y, or the percentage change between two numbers.
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Date Calculator
Calculate the number of days, weeks, and months between two dates or add and subtract days from any date. Free and instant.
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Time Calculator
Add or subtract hours, minutes, and seconds or convert between time units instantly. Free online time calculator.
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Discount Calculator
Calculate the final price after a discount and see how much you save. Enter the original price and discount percentage to get instant results.
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Formatters & Validators
View categoryJSON Formatter
Format, prettify, or minify JSON data instantly. Paste your JSON and get clean, readable output with customizable indentation.
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JSON Validator
Validate your JSON data instantly. Get clear error messages for invalid JSON and see type, size, and depth info for valid JSON.
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Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8 characters. Free, fast, and runs entirely in your browser.
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Word Counter
Count words, characters, sentences, and paragraphs in your text. See estimated reading time. Free and instant.
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Character Counter
Analyze your text with a detailed character breakdown: letters, digits, spaces, punctuation, uppercase, lowercase, and more.
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Converters
View categoryImage to WebP Converter
Convert JPG, PNG, GIF, and other images to WebP format instantly. Adjust quality and reduce file size. Runs entirely in your browser.
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JPG to PNG Converter
Convert JPG and other images to PNG format instantly. Lossless conversion that runs entirely in your browser. No upload required.
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Bytes Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes instantly. Free online data size converter.
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Unit Converter
Convert between length, weight, and volume units instantly. Supports metric and imperial units. Free and fast.
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Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. Free online temperature converter with precise results.
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Finance
View categoryCompound Interest Calculator
See how your savings or investments grow with compound interest. Add monthly contributions, pick a compounding frequency, and view a year-by-year breakdown.
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Savings Goal Calculator
Find out how long it takes to reach a savings goal, or how much to save each month. Works in both directions and includes interest (APY).
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Sales Tax & VAT Calculator
Add sales tax or VAT to a price, or work backwards to remove tax from a total. Includes a reverse-tax mode and common US state and VAT rates.
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Loan Calculator
Calculate your monthly loan payment (EMI), total interest, and total cost, and see a full year-by-year amortization schedule. For personal, auto, and home loans.
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Mortgage Calculator
Estimate your full monthly mortgage payment — principal, interest, property tax, home insurance, and PMI — with a complete amortization schedule.
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Auto Loan Calculator
Calculate your car loan's monthly payment including trade-in, sales tax, and down payment. See the amount financed and total interest.
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ROI Calculator
Calculate return on investment (ROI) and annualized ROI from your cost and final value. See your net profit and yearly rate of return.
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Health & Fitness
View categoryTDEE Calculator
Calculate your TDEE and daily calorie needs to lose, maintain, or gain weight. Uses the Mifflin-St Jeor equation with your activity level.
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Macro Calculator
Calculate your daily macros — protein, carbs, and fat in grams — for cutting, maintaining, or bulking. Choose a split like balanced, high-protein, or keto.
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Body Fat Calculator
Estimate your body fat percentage with the US Navy tape method using just a measuring tape. See your category, fat mass, and lean body mass.
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Ideal Weight Calculator
Find your ideal body weight for your height using the Devine, Robinson, Miller, and Hamwi formulas, plus your healthy BMI weight range.
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Running Pace Calculator
Calculate your running pace per km and per mile, your speed, and predicted finish times for 5K, 10K, half marathon, and marathon.
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Developer Tools
View categoryPassword Generator
Generate strong, random, secure passwords with custom length and character types. Created entirely in your browser — nothing is sent or stored.
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Color Converter
Convert colors between HEX, RGB, and HSL instantly. Pick a color or paste a HEX code and copy any format with one click.
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UUID Generator
Generate random version 4 UUIDs (GUIDs) in bulk. Created in your browser with a cryptographically secure random generator. Copy one or all.
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QR Code Generator
Create a QR code from any text or URL and download it as a PNG. Generated in your browser, free, with no watermark and no sign-up.
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Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text instantly. Runs entirely in your browser — nothing is uploaded.
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Text Tools
View categoryCase Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case instantly.
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Lorem Ipsum Generator
Generate lorem ipsum placeholder text by paragraphs, sentences, or words. Copy dummy text instantly for mockups, layouts, and designs.
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Text Diff Checker
Compare two texts and highlight the differences line by line — added and removed lines shown clearly. Runs entirely in your browser.
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Slug Generator
Turn any title into a clean, SEO-friendly URL slug. Lowercases text, strips accents and punctuation, and joins words with hyphens or underscores.
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Word Frequency Counter
Count how often each word appears in your text. See total and unique word counts and the most frequent words with their percentages.
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