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Welcome to Knowdust - Your hub for simple online tools

Browse our complete collection of free online tools

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Simple educational tables and reference guides for quick learning

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Fast and easy-to-use online calculator with keyboard support

Calculate your exact age in years, months, days, and hours

Calculate your Body Mass Index with health recommendations

Estimate your daily calorie needs based on activity level

Plan and calculate your debt payoff strategy with ease

Calculate potential investment growth over time with compound interest

Calculate monthly payments, interest, and amortization schedule

Calculate tips and split bills among multiple people

Calculate income tax, deductions, and estimate your tax refund

Calculate monthly mortgage payments, interest, and total cost

Plan your retirement savings and estimate future income

Find your zodiac sign and learn about your personality traits

Calculate compound interest and investment growth over time

Generate strong, secure passwords with customizable options

Create custom QR codes for URLs, WiFi, contacts, and more

Generate professional barcodes - CODE128, EAN13, UPC, CODE39, and more

Generate unique identifiers (UUIDs) - v1 and v4 formats with bulk generation

Generate placeholder text for design and development

Generate beautiful color schemes with harmony rules - monochromatic, analogous, complementary

Convert between different units of measurement

Convert between different currencies with live exchange rates

Convert PNG images to JPG format - reduce file size while maintaining quality

Convert JPG/JPEG images to PNG format - lossless quality with transparency support

Convert JPG/JPEG images to WebP format - reduce file size by 25-35% with superior quality

Convert WebP images to JPG/JPEG format - universal compatibility for all devices

Convert PNG images to WebP format - reduce file size by 25-50% with transparency support

Convert WebP images to PNG format - lossless quality with universal compatibility

Convert SVG vector graphics to PNG - adjustable resolution (1x-4x) for web and print

Convert PNG images to SVG format - create scalable vector graphics from raster images

Encode and decode text and files to/from Base64 format

Encode and decode URLs and query parameters

Encode and decode HTML entities and special characters

Encode and decode text and files to/from hexadecimal format

Encode and decode data to/from JSON format

Format, validate, and beautify JSON data

Format, validate, and beautify XML documents

Minify and compress CSS files for better performance

Count words, characters, sentences with reading time analysis

Pick, convert colors between HEX, RGB, HSL formats with palettes

Create minimal SVG logos with Lucide icons - customize colors and export

Interactive world map editor - color countries, add markers, export as SVG

Online stopwatch and timer for tracking time

Interactive calendar with date calculations

Flip a virtual coin with statistics tracking. Make fair 50/50 decisions.

Roll realistic 3D dice with statistics. Perfect for board games, RPGs, and probability learning.

Classic two-player strategy game with statistics. Challenge a friend to a quick match!