Free Online Tools

Convert Markdown to HTML instantly with live preview. Free online tool for developers, bloggers, and writers.

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Strong Password Generator

Security

Generate secure, random passwords with customizable length and character options. Free online password generator with strength meter.

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BMI Calculator - Body Mass Index

Calculate your Body Mass Index (BMI) instantly. Free online BMI calculator with health categories and weight status.

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BMR Calculator - Basal Metabolic Rate

Calculate your Basal Metabolic Rate (BMR) and daily calorie needs instantly. Free online BMR calculator with TDEE and macronutrient breakdown.

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Body Fat Calculator - Body Fat Percentage

Calculate your body fat percentage instantly using the US Navy method. Free online body fat calculator with lean mass and health category analysis.

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Percentage Calculator

Calculate percentages instantly. Free online percentage calculator for discounts, tips, taxes, scores, and more.

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Age Calculator

Calculate your exact age from birthdate instantly. Free online age calculator with years, months, days and detailed statistics.

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Color Converter (HEX/RGB/HSL)

Convert colors between HEX, RGB, and HSL formats instantly. Free online color converter for designers and developers.

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Unit Converter

Convert units instantly - length, weight, temperature, volume, area, speed, and more. Free online unit converter for everyday use.

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QR Code Generator

Utilities

Generate custom QR codes instantly for URLs, text, WiFi, emails, and more. Free online QR code creator with download option.

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Hash Generator (MD5/SHA-1/SHA-256/SHA-512)

Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) instantly. Free online hash generator for developers and security professionals.

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JSON Formatter & Validator

Format, validate, and minify JSON instantly. Free online JSON tool for developers with syntax highlighting and error detection.

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UUID/GUID Generator & Validator

Generate UUIDs (v1, v3, v4, v5) and validate UUID formats. Free online UUID generator for developers with batch generation.

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Time Zone Converter - World Clock

Utilities

Convert time between time zones instantly. Free online world clock and time zone converter for global meetings and travel planning.

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Word & Character Counter - Text Analyzer

Writing

Count words, characters, paragraphs, and sentences in real-time. Perfect for writers, students, and content creators.

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Calorie Calculator - TDEE & Macros

Calculate your daily calorie needs, TDEE (Total Daily Energy Expenditure), and macronutrient breakdown. Free online calorie calculator for fitness and weight management.

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Base64 Encoder/Decoder

Encode or decode Base64 data instantly. Free online Base64 converter for developers with URL-safe and line-wrap options.

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Loan & Mortgage Calculator

Calculate loan payments, mortgage installments, and total interest instantly. Free online loan calculator with amortization schedule and extra payment analysis.

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Case Converter - Text Case Changer

Writing

Convert text between UPPER, lower, Title, Camel, snake, kebab and more cases instantly. Free online text case converter for developers and writers.

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Date Calculator - Days Between Dates

Calculate days between dates, add/subtract days from a date, and find exact date differences. Free online date calculator.

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Tip Calculator - Restaurant Gratuity Calculator

Calculate restaurant tips and split bills instantly. Free online tip calculator with customizable tip percentages and bill splitting.

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Water Intake Calculator - Daily Hydration Calculator

Calculate your daily water intake needs based on weight, activity level, and conditions. Free online hydration calculator with personalized recommendations.

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Discount Calculator - Sale Price Calculator

Calculate discounts and final prices instantly. Free online discount calculator with percentage off, amount off, and multiple discount options.

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Inflation Calculator - Purchasing Power Calculator

Calculate inflation and purchasing power changes over time. Convert dollar amounts between different years using CPI data. Free online inflation calculator.

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Pregnancy Due Date Calculator - Baby Due Date Calculator

Calculate your baby's due date instantly from your last period date. Free online pregnancy calculator with trimester info, milestones, and pregnancy week tracker.

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Ovulation Calculator - Fertile Window & Ovulation Date

Calculate your fertile window and ovulation date instantly. Free online ovulation calculator to help plan pregnancy with accurate fertile days prediction.

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Crypto Profit Calculator - Investment Return Calculator

Calculate cryptocurrency investment profits and losses with buy/sell prices, fees, and ROI analysis. Free online crypto profit calculator.

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Currency Converter - Exchange Rate Calculator

Convert currency between USD, EUR, KRW, JPY, GBP and more. Free online exchange rate calculator with real-time rates.

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Aspect Ratio Calculator - Video/Image Ratio Calculator

Media

Calculate aspect ratios instantly for videos, images, and screens. Free online ratio calculator with common presets and scaling dimensions.

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GPA Calculator - Grade Point Average

Education

Calculate your GPA (Grade Point Average) instantly. Free online GPA calculator with letter grade and percentage options for students.

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Stopwatch - Online Timer with Lap Function

Utilities

Free online stopwatch with millisecond precision, lap function, and pause/resume capabilities. Perfect for timing workouts, cooking, and more.

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Sales Tax Calculator - Tax Rate Calculator

Calculate sales tax and final price instantly. Free online sales tax calculator with US state tax rates and custom tax options.