Free Online Tools — Image, PDF, SEO & More | RKTech101

🔐 MD5 Hash Generator Generate MD5, SHA1 and SHA256 hash instantly Enter Text: MD5 Copy — SHA1 Copy — SHA256 Copy — ↺ Clear 📋 Copy All Free MD5 Hash Generator — Generate MD5, SHA1 and SHA256 Hash Instantly In the world of cybersecurity, data integrity, and software development, hash functions are one of the most fundamental and widely used tools. Whether you are a developer verifying file integrity, a security professional checking passwords, a student learning about cryptography, or a system administrator working with databases, hash generators are essential. Our Free MD5 Hash Generator on RKTech101 lets you generate MD5, SHA1, and SHA256 hashes for any text instantly — completely free, no login required, works on any device. In this article, we will explain what hash functions are, how MD5, SHA1, and SHA256 work, their real-life uses, their security differences, and how to use our Hash Generator tool. ...

⚖️ BMI Calculator Calculate your Body Mass Index instantly Metric (kg/cm) Imperial (lb/ft) Height (cm) Weight (kg) Height (ft) Height (in) Weight (lbs) Age 👨 Male 👩 Female ⚖️ CALCULATE BMI 0 BMI SCALE Underweight Below 18.5 Normal Weight 18.5 – 24.9 Overweight 25.0 – 29.9 Obese Class I 30.0 – 34.9 Obese Class II+ 35.0 and above IDEAL WEIGHT RANGE FOR YOUR HEIGHT Free BMI Calculator — Calculate Your Body Mass Index and Healthy Weight Instantly Your health is your most valuable asset, and understanding your body weight in relation to your height is one of the most important steps toward a healthier life. Body Mass Index, commonly known as BMI, is a simple yet powerful tool used by doctors, nutritionists, and fitness professionals worldwide to assess whether a person has a healthy body weight. Our Free BMI Calculator on RKTech101 lets you calculate yo...

🌡️ Temperature Converter Convert Celsius, Fahrenheit, Kelvin and Rankine instantly °C CELSIUS °F FAHRENHEIT K KELVIN °R RANKINE ↺ Reset QUICK REFERENCE Water Freezes 0°C = 32°F = 273.15K Body Temperature 37°C = 98.6°F = 310.15K Water Boils 100°C = 212°F = 373.15K Absolute Zero -273.15°C = -459.67°F = 0K Room Temperature 25°C = 77°F = 298.15K Free Temperature Converter — Convert Celsius, Fahrenheit and Kelvin Instantly Temperature is one of the most frequently measured and converted units in everyday life. Whether you are checking the weather forecast from a foreign website, following a cooking recipe from an American cookbook, studying science, or working in a technical field, you will often need to convert temperatures between different scales. Our Free Temperature Converter on RKTech101 lets you instantly convert between Celsius, Fahrenheit, Kelvin, and Rankine — completely free, no login required, works on ...

📏 Unit Converter Convert Length, Weight, Area, Speed and more instantly Select Category: 📏 Length ⚖️ Weight 📐 Area 🚀 Speed 🧪 Volume ⏰ Time From: ⇅ Swap To: 0 ALL CONVERSIONS Free Unit Converter — Convert Length, Weight, Area, Speed and More Instantly Unit conversion is something we all need to do regularly in our daily lives. Whether you are converting kilometers to miles for a road trip, kilograms to pounds for a fitness goal, liters to gallons for fuel calculation, or square meters to acres for real estate — having a reliable unit converter saves time and prevents errors. Our Free Unit Converter on RKTech101 handles six major categories of unit conversion — Length, Weight, Area, Speed, Volume, and Time — completely free, no login required, works on any device. In this article, we will explain what unit conversion is, why it is important, the different categories our tool covers, real-life exa...

⏱️ Stopwatch Timer Track time with precision — start, stop, lap and reset 00:00:00 .000 ▶ Start 🏁 Lap ↺ Reset LAP TIMES Free Online Stopwatch Timer — Track Time with Precision Instantly Whether you are timing a workout, measuring how long a task takes, tracking a cooking timer, or timing a race, a reliable stopwatch is an essential tool. In the past, people carried physical stopwatches for timing purposes. Today, a free online stopwatch on your phone or computer is far more convenient. Our Free Online Stopwatch Timer on RKTech101 gives you a precise, easy-to-use stopwatch with start, pause, lap, and reset features — completely free, no app download needed, works on any device. In this article, we will explain what a stopwatch is, how it works, the many uses of a stopwatch in daily life, sports, fitness, education, and work, and how to use our online Stopwatch Timer tool. What is a Stopwatch? A stopwatch is a timepiece designed to measu...

🔢 Percentage Calculator Calculate percentages instantly and easily 📌 What is X% of Y? Calculate 📌 X is what % of Y? Calculate 📌 Percentage Change (Increase/Decrease) Calculate 📌 Add/Subtract Percentage + Add % - Subtract % Free Percentage Calculator — Calculate Percentages Instantly and Easily Percentages are one of the most commonly used mathematical concepts in everyday life. From calculating discounts while shopping, to figuring out exam scores, to understanding tax rates, to tracking business growth — percentages are everywhere. Yet many people struggle with percentage calculations, especially when the numbers are not round figures. Our Free Percentage Calculator on RKTech101 solves this problem instantly. With four different calculation modes, it handles every type of percentage problem you can think of — completely free, no login required, works on any device. In this article, w...

🎨 Color Picker Tool Pick any color and get HEX, RGB and HSL values HEX #00C4FF Copy RGB rgb(0, 196, 255) Copy HSL hsl(195, 100%, 50%) Copy Enter HEX Code Manually: Apply Color Shades: Free Color Picker Tool — Get HEX, RGB and HSL Color Codes Instantly Colors are everywhere — in websites, mobile apps, graphic designs, logos, and digital art. Every color you see on a screen is defined by a specific code that tells the computer exactly which color to display. If you are a web developer, graphic designer, UI/UX designer, or just someone curious about colors, having a reliable Color Picker tool is essential. Our Free Color Picker Tool on RKTech101 lets you pick any color and instantly get its HEX, RGB, and HSL codes — completely free, no login required, works on any device. In this article, we will explain what color codes are, the difference between HEX, RGB, and HSL, how to use our Color Picker tool, and ...

📱 QR Code Generator Convert any text or URL into a QR Code instantly Enter Text or URL: QR Size Small (150px) Medium (200px) Large (300px) Extra Large (400px) Background White Black Light Gray 📱 GENERATE QR CODE ⬇️ Download QR Code Free QR Code Generator — Create QR Codes for Any Text or URL Instantly In today's fast-moving digital world, QR codes have become one of the most useful and widely used technologies. You see them everywhere — on restaurant menus, product packaging, business cards, advertisements, and even on government documents. If you have ever wanted to create your own QR code for free, you are in the right place. Our Free QR Code Generator tool on RKTech101 lets you create QR codes for any text, URL, phone number, or message in just one click — completely free, no login required. In this article, we will explain what QR codes are, how they work, the many uses of QR codes, and how to use...

🎂 Age Calculator Find your exact age in years, months and days Enter Your Date of Birth: 🎂 CALCULATE AGE 0 Years Old 0 Months 0 Days 0 Hours Next Birthday In Day You Were Born Free Age Calculator — Find Your Exact Age in Years, Months and Days Have you ever wondered exactly how old you are — not just in years, but in months, days, and even hours? Most people know their age in years, but very few know their precise age down to the exact day. Our Free Age Calculator tool makes it incredibly easy to find your exact age in seconds. Whether you need it for official documents, curiosity, or just for fun, this tool gives you accurate results instantly. In this article, we will cover everything about age calculation — how it works, why it matters, common uses of an age calculator, and how to use the RKTech101 Age Calculator tool effectively. What is an Age Calculator? An age calculator is an online tool...