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Convert units by selecting text. 7+ categories, 42 currencies, dark mode. Auto-converts with smart defaults. How to use: Select any text with a unit (e.g., "30 USD", "5 kg", "10 km") A popup will appear with auto-converted results Use the settings icon to change target units Copy to clipboard Enjoy instant conversions on any webpage! Supported units: - Length: meters, feet, miles, inches, kilometres… - Mass: grams, kilograms, pounds, ounces… - Volume: litres, millilitres, gallons, cups… - Temperature: °C, °F, K Time, speed, area, energy, pressure and more - Currencies with live FX rates (e.g. EUR ↔ USD, GBP ↔ PLN, etc.) SwapUnits is designed for both engineers and everyday users – from quick household conversions to more advanced technical unit changes.