Unit Converter-Free & Easy

20 languages·Live rates·Offline·Rating prompt now live

ConvertMaster is a completely free, ad-free unit converter. Launch and go. No sign-up. No data collection. All 40 categories are permanently free. No paywalls.

ALL FEATURES FREE FOREVER: • 40 categories — currency, length, weight, area, volume, temperature, speed, time, pressure, energy, power, data storage, cooking, angle, fuel, force, torque and more • 200+ currencies with live exchange rates, updated hourly • Currency picker with search — find any currency instantly • Multilingual currency names (CLDR standard) • Home page ranks categories by your usage frequency • Restores your last-used category on launch • Batch convert — enter multiple values, see all results instantly • CSV export for batch results • Metric and imperial side by side • Scientific notation for extreme values • Dark mode • 100% offline (except live currency rates)

No account. No sign-up. No data collection. No internet required (except live rates).

Most converters limit their currency list or lock categories behind paywalls. ConvertMaster gives you everything — 200+ currencies with search, 40 categories — all for free, forever.

Voluntary support available in app — optional, never nagged.

No data collected. No tracking. No sharing. Your numbers, on your device only.