RTools

URL Encoder & Decoder – Free Online Tool Use this free URL Encoder & Decoder to safely encode special characters in text or links, or decode encoded URLs back to readable text. Everything runs in your browser—secure and private. Contents: URL Encoder & Decoder • Examples • FAQ URL Encoder & Decoder Input (text or URL) Encode Decode Copy Output Output Examples Text: Hello World! → Hello%20World%21 Symbols: a+b=c → a%2Bb%3Dc Full URL: https://rtools.xyz/page?search=blue sky → https://rtools.xyz/page?search=blue%20sky FAQ – URL Encoder & Decoder Why do I need URL encoding? URLs can’t contain spaces or unsafe characters. Encoding ensures links are valid and safe for browsers and servers. Can I decode multiple lines at once? Yes. Paste any long string, and the tool decodes it fully. Is this the same as HTML escaping? No. URL encoding is for query stri...

Base64 Encoder & Decoder – Text & File Converter Use this free Base64 Encoder & Decoder to convert text or files into Base64, and decode Base64 back into text or files. Everything runs in your browser—secure and private. Contents: Base64 Tool • Uses • FAQ Base64 Encoder & Decoder Input (text or Base64) Optional: upload a file to encode Encode Decode Copy Output Download Output Output Why Use a Base64 Converter? Embed images in HTML/CSS directly with Base64. Send binary data in JSON or APIs safely. Encode files to transmit over text-only channels. Decode Base64 received from APIs back into readable text or files. FAQ – Base64 Encoder & Decoder Is Base64 secure? No. Base64 is encoding, not encryption. It hides binary but doesn’t secure it. For security, use encryption. Can I encode images? Yes. Upload an image file, and the ...

Color Converter & Picker – HEX, RGB, HSL, CMYK + Contrast Checker Convert colors between HEX , RGB , HSL , and CMYK with a live preview. Check WCAG contrast against a background color, and generate a random palette . Everything runs locally—no data saved. Contents: Color Converter • Contrast Checker • FAQ Color Converter & Picker Pick Color HEX RGB HSL CMYK Update from HEX Update from RGB Update from HSL Update from CMYK Random Palette Copy Copy Copy Copy Palette Click a swatch to copy HEX. WCAG Contrast Checker Text (FG) Background (BG)   Check...

JSON Formatter & Validator – Pretty Print, Minify, Sort Keys Format and validate JSON instantly. This free tool can pretty-print , minify , sort keys , and lets you copy or download the result. Everything runs in your browser—no uploads. Contents: JSON Formatter • Tips • FAQ JSON Formatter & Validator Format Minify Sort Keys (A→Z) Validate Copy Output Download .json Indent: 2 4 Tab Input JSON Or drop a file anywhere in this box Output Tips Validate first if you’re unsure the JSON is valid. Use Sort Keys before running a diff in Git or comparing configs. Switch indentation between 2 / 4 / Tab to match your project style. Drag & drop a .json file directly into the input area. FAQ – JSON Formatter & Validator Wh...

Unit Converter – Length, Weight, Temperature, Area, Volume, Speed, Time & Digital Storage Use this free Unit Converter to instantly convert Length, Weight, Temperature, Area, Volume, Speed, Time, and Digital Storage . Everything runs in your browser—no data saved. Contents: Unit Converter • How It Works • FAQ Unit Converter Category From To Value Convert Swap How This Unit Converter Works Select a category (Length, Weight, Temperature, etc.). Choose From and To units. Enter a value and click Convert . For temperature, the tool applies correct conversion formulas (°C ↔ °F ↔ K). FAQ – Unit Converter Does it support both metric and imperial? Yes. You can convert meters to feet, kilograms to pounds, liters to gallons, etc. Can it convert digital units? Yes. Bytes, KB, MB, GB, TB are supported...

Password Generator – Strong, Random & Secure Online Tool Use this free Password Generator to create strong, random, and secure passwords instantly. Customize length , uppercase/lowercase letters , numbers , and symbols . Copy passwords with one click. Everything runs locally in your browser—no data saved. Contents: Password Generator • How It Works • FAQ Password Generator Length Lowercase (a–z) Uppercase (A–Z) Numbers (0–9) Symbols (!@#$...) Exclude similar (0,O,l,1) Generate Copy How This Password Generator Works Uses window.crypto.getRandomValues for secure randomness. Customizable: choose password length (4–128) and character sets. Exclude similar characters option to avoid confusion. One-click copy for quick use. FAQ – Password Generator What length is best for a secure password? At least 12–16 characters. For maximum security, use 20+ with all cha...

Simple Interest & Compound Interest Calculator Use this free Interest Calculator to compute Simple Interest (SI) and Compound Interest (CI) . Get total maturity amount , interest earned , Effective Annual Rate (EAR) , and a full compounding schedule with CSV export. 100% browser-based. Contents: Calculator • How It Works • FAQ Interest Calculator Principal Rate (% annual) Time (years) Type Simple Interest Compound Interest Compounding Annual Half-Yearly Quarterly Monthly Daily Calculate Reset Download Schedule (CSV) Interest — Total Amount — Effective Annual Rate — Period Balance How This Interest Calculator Works Simple Interest (SI) : SI = P×R×T ÷ 100. Interest grows linearly. Compound Interest (...

Percentage Calculator – % of, % Change, Reverse Percentage & Discount Use this free Percentage Calculator for fast X% of Y , what percent , percent increase/decrease , reverse percentage , and discount & final price (stackable discounts + tax). Everything runs in your browser—no data saved. Contents: Percentage Calculator • Examples • FAQ Percentage Calculator X% of Y What percent? % Change Reverse % Discount & Final Price Percent (%) Of (base) Calculate Copy A (part) B (whole) Calculate Copy Original New Calculate Copy Final value % change Direction Final after increase Final after decrease ...

BMI Calculator – Body Mass Index, Category & Healthy Weight Range Use this free BMI Calculator to compute your Body Mass Index from height and weight in metric or imperial units. See your adult BMI category (WHO) , BMI Prime , and the healthy weight range for your height. Everything runs in your browser—no data saved. Contents: BMI Calculator • How It Works • Adult BMI Categories • FAQ BMI Calculator Units Metric (kg, cm) Imperial (lb, ft/in) Weight (kg) Height (cm) Weight (lb) Height (ft / in) Calculate Reset Auto-calc while typing Your BMI — — BMI Prime — BMI ÷ 25 (healthy upper bound) Healthy Weight Range — for BMI 18.5–24.9 ...