All Tools
Browse all 52 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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Tip Calculator & Bill Splitter
Calculate the tip and split a restaurant bill between any number of people. Tip presets, per-person totals, and the full amount — instantly.
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GPA Calculator
Calculate your GPA on a 4.0 scale from your course grades and credit hours. Add each class, pick a letter grade, and get your weighted GPA instantly.
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Final Grade Calculator
Find out exactly what score you need on your final exam to reach your target grade. Enter your current grade, goal, and the final's weight.
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Fuel Cost Calculator
Estimate the fuel cost of any trip. Enter distance, your vehicle's efficiency, and fuel price — in US (MPG) or metric (L/100km) units.
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Random Number Generator
Generate random numbers in any range, with or without repeats. Uses your browser's secure random generator. Pick one number or a whole list.
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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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PNG to JPG Converter
Convert PNG images to JPG instantly with adjustable quality. Runs entirely in your browser — no uploads, no watermark, no sign-up.
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Image Compressor
Compress JPG, PNG, and WebP images to reduce file size with an adjustable quality slider. Runs in your browser — no uploads, no limits.
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Image Resizer
Resize any image to exact pixel dimensions with optional aspect-ratio lock. Runs entirely in your browser — no uploads or sign-up.
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WebP to JPG / PNG Converter
Convert WebP images to JPG or PNG instantly in your browser. No uploads, no watermark — ideal for opening WebP files in older software.
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Image to PDF Converter
Convert one or more images into a single PDF. Each image becomes a page, sized to fit A4. Runs in your browser — no uploads, no watermark.
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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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JWT Decoder
Decode a JWT (JSON Web Token) to read its header, payload, and claims. Runs entirely in your browser — your token is never uploaded.
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Unix Timestamp Converter
Convert Unix timestamps (epoch) to human-readable dates and back. Auto-detects seconds vs milliseconds. Shows UTC, local, and ISO time.
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URL Encoder / Decoder
Encode text for safe use in URLs, or decode percent-encoded strings back to plain text. Handles spaces, symbols, and Unicode. Free and private.
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Cron Expression Parser
Paste a cron expression to see a plain-English breakdown of each field and the next 5 run times. Presets for common schedules included.
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Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Handles very large values with no precision loss. Free and private.
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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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