UnitShift - Unit Converter

Convert any unit instantly. Highlight numbers on any page or use the popup. Scientific units for Pro users.

UnitShift is the fastest way to convert any unit while browsing the web. Highlight any number on any page, right-click, and get instant conversions in a floating panel — no tab switching, no copy-pasting. FREE FEATURES - 6 everyday categories: Length, Weight, Temperature, Volume, Speed, Area - Highlight any number on any webpage → instant floating conversion panel - Auto-detects the unit from surrounding text (highlights "5 miles" → knows it's Length) - Shows top 3 conversions simultaneously - Popup converter with live calculation as you type - Swap units with one click - Copy result to clipboard instantly - Recent conversions history - Keyboard shortcut: Cmd+Shift+U (Mac) / Ctrl+Shift+U (Windows) PRO FEATURES — $4.99/month - 11 additional scientific categories: Pressure, Energy, Power, Concentration, Data, Force, Frequency, Torque, Density, Flow Rate, Radiation Dose - Perfect for engineers, scientists, researchers, and medical professionals - Unlock via license key from the settings page PERFECT FOR - Students and researchers working with scientific papers - Engineers switching between metric and imperial - Travelers converting currencies and distances - Medical professionals working with lab values - Anyone tired of opening a new tab just to convert a unit Privacy: All conversions happen locally in your browser. No data is collected or transmitted.