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Math & Calculators5

Percentage CalculatorCalculate percentages, increases, and decreases

Tip CalculatorCalculate tips and split bills easily

BMI CalculatorCalculate Body Mass Index and health metrics

Roman Numeral ConverterConvert regular numbers to Roman numerals instantly

Base Number ConverterConvert numbers between binary, octal, decimal, duodecimal, hexadecimal, and base 36

Converters2

Unit ConverterConvert between different units of measurement

Currency ConverterConvert between world currencies with live rates

Text Tools3

Word CounterCount words, characters, sentences, and paragraphs in real-time

Case ConverterConvert text between different cases (uppercase, lowercase, title case, etc.)

ASCII Character ReferenceComplete ASCII table with searchable characters, codes (decimal, hex, binary), and copy functionality

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Lorem Ipsum GeneratorGenerate customizable placeholder text with adjustable word count (1-1000 words)

Password GeneratorGenerate strong, secure passwords

QR Code GeneratorCreate QR codes from text or URLs

UUID GeneratorGenerate universally unique identifiers

Color Tools2

Color PickerPick colors and get HEX, RGB, HSL values

Gradient GeneratorCreate beautiful CSS gradients

Time & Date5

Timestamp ConverterConvert between Unix timestamps and human-readable dates

Time Zone ConverterConvert times between different time zones

Timer & StopwatchOnline countdown timer and stopwatch with lap tracking and custom presets

Online TimerFree countdown timer with custom presets and audio notifications

Online StopwatchFree stopwatch with lap tracking and local storage

Image Tools3

Icon GeneratorCreate custom icons and graphics

Photo Filter StudioApply professional photo filters and adjustments with real-time preview

Image to ASCIIConvert images to ASCII art with customizable character sets and styles

Hardware Tools1

Roku CompatibilityCheck compatibility and features for Roku devices

OCR Tools2

Barcode ReaderScan and store retail product barcodes using your device camera

On! Reward Code ScannerScan and store On! Nicotine reward codes from product packaging

Music & Audio1

Morse Code ConverterConvert text to Morse code with real-time translation and audio playback

Social Media1

Social Media LaunchpadLaunch and manage social media posts

Scientific Tools1

Periodic Table of ElementsInteractive periodic table with detailed element properties

MDN Web Docs

Web Standards

October 24, 2025 beginner

MDN Web Docs

Resources for developers, by developers

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About This Resource

MDN Web Docs is the most comprehensive and accurate source of documentation for web technologies including HTML, CSS, JavaScript, and Web APIs. Created and maintained by Mozilla and the developer community.

Tags

#HTML

#CSS

#JavaScript

#Web APIs

#Documentation

Details

CategoryWeb Standards

Difficulty Level Beginner

PublishedOctober 24, 2025

PricingFree

Visit MDN Web Docs

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